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1. Recognition and Health Impacts of Organic Pollutants with Significantly Different Proportions in the Gas Phase and Size-Fractionated Particulate Phase in Ambient Air

Author:
Lin Qiao; Lirong Gao; Yang Liu; Di Huang; Da Li; Minghui Zheng
Source:
Environmental science & technology 2022 v.56 no.11 pp. 7153-7162
ISSN:
1520-5851
Subject:
air; benzoic acid; chemometrics; comprehensive two-dimensional gas chromatography; dermal exposure; human health; humans; mass spectrometry; models; particle size; permeability; phthalates; prioritization; propionic acid; technology
Abstract:
... The distributions of organic pollutants in the gas phase and size-fractionated particle phases can largely affect human health risks posed by them. Gas–particle partitioning and particle-size distributions of some known pollutants have been investigated. However, the pollutants which are more likely to enter the human body and cause strong adverse effects may be neglected. In this study, a nontarg ...
DOI:
10.1021/acs.est.1c08829

2. Untargeted metabolomics study of Lonicerae japonicae flos processed with different drying methods via GC-MS and UHPLC-HRMS in combination with chemometrics

Author:
Shu-Fang Li; Xiao-Meng Guo; Xue-Fei Hao; Shu-Hui Feng; Yong-Jian Hu; Ya-Qin Yang; Hui-Feng Wang; Yong-Jie Yu
Source:
Industrial crops and products 2022 v.186 pp. 115179
ISSN:
0926-6690
Subject:
air; antioxidants; chemometrics; chlorogenic acid; gas chromatography-mass spectrometry; heat; liquid chromatography; metabolomics; polyphenols; rutin; secondary metabolites
Abstract:
... The medicinal values and economic benefits of Lonicerae japonicae flos are directly affect by the post-harvest processing due to the organoleptic and chemical properties. To explore the differences of Lonicerae japonicae flos obtained by various drying methods, untargeted metabolomics combined with chemometrics was first used to investigate the metabolite differences among them. The metabolomics a ...
DOI:
10.1016/j.indcrop.2022.115179

3. Chemometric analysis of air pollutants in raw and thermally treated coals – Low-emission fuel for domestic applications, with a reduced negative impact on air quality

Author:
Roksana Muzyka; Maciej Chrubasik; Małgorzata Pogoda; Marcin Sajdak
Source:
Journal of environmental management 2021 v.281 pp. 111787
ISSN:
0301-4797
Subject:
European Union; air; air quality; chemometrics; combustion; dust; flue gas; principal component analysis; total organic carbon; variance; Poland
Abstract:
... The emission of pollutants into the air during the combustion of solid fuels in households is still a significant problem in many European Union countries, including Poland. These emissions are a significant source of many air pollutants formed during incomplete combustion and has been identified as one of the leading environmental risk factors for these populations. One of the solutions is to uti ...
DOI:
10.1016/j.jenvman.2020.111787

4. Development of 1H‐NMR methods for quantitative determination of alkylamides in Zanthoxylum bungeanum and quality evaluation based on its fingerprint

Author:
Nuernisa Kasimu; Danmeng Yu; Leiwen Sun; Ruofei Zheng; Dongmei Wang
Source:
Journal of food science 2021 v.86 no.9 pp. 3951-3963
ISSN:
0022-1147
Subject:
Zanthoxylum bungeanum; air; chemometrics; deuterium; ethanol; flavor; food science; germplasm; harvest date; hemp; nuclear magnetic resonance spectroscopy; pyrazines; quantitative analysis; solvents
Abstract:
... Alkylamides, as the representative hemp flavor and active ingredients, can reflect the quality of Zanthoxylum bungeanum Maxim. However, conjugated triene structure exists in alkylamides, which is easy to be oxidized and decomposed in air, making it difficult to quantify. In this study, a method for the quantitative determination of alkylamides by ¹H‐NMR technology was developed with 85% ethanol as ...
DOI:
10.1111/1750-3841.15869

5. Forecasts of tropospheric ozone in the Metropolitan Area of Rio de Janeiro based on missing data imputation and multivariate calibration techniques

Author:
Rafael C. G. de Oliveira; Camilla L. Cunha; Alexandre R. Tôrres; Sergio M. Corrêa
Source:
Environmental monitoring and assessment 2021 v.193 no.8 pp. 531
ISSN:
0167-6369
Subject:
air; air quality; calibration; carbon monoxide; chemometrics; metropolitan areas; nitrogen; ozone; prediction; relative humidity; solar radiation; support vector machines; temperature; troposphere; wind speed; Brazil
Abstract:
... Multivariate calibration based on partial least squares, random forest, and support vector machine methods, combined with the MissForest imputation algorithm, was used to understand the interaction between ozone and nitrogen oxides, carbon monoxide, wind speed, solar radiation, temperature, relative humidity, and others, the data of which were collected by air quality monitoring stations in the me ...
DOI:
10.1007/s10661-021-09333-2

6. Identification of changes in the volatile compounds of robusta coffee beans during drying based on HS-SPME/GC-MS and E-nose analyses with the aid of chemometrics

Author:
Ke Zhang; Jinhuan Cheng; Qidi Hong; Wenjiang Dong; Xiaoai Chen; Guiping Wu; Zhenzhen Zhang
Source:
Lebensmittel-Wissenschaft + Technologie 2022 v.161 pp. 113317
ISSN:
0023-6438
Subject:
Coffea canephora; air; chemometrics; electronic nose; flavor; gas chromatography-mass spectrometry; headspace analysis; heat; principal component analysis; solid phase microextraction; sulfur
Abstract:
... In this study, headspace solid-phase microextraction/gas chromatography-mass spectrometry (HS-SPME/GC-MS) and electronic-nose (E-nose) analyses were performed to examine the comprehensive flavor profiles of robusta coffee during heat air drying. A total of 62 volatile compounds were identified by HS-SPME/GC-MS, the level of acids, aldehydes, alcohols and esters decreased during drying process, how ...
DOI:
10.1016/j.lwt.2022.113317

7. Multi‐objective optimization of drying conditions for the Olea europaea L. leaves with NSGA‐II

Author:
Nilüfer Vural; Zeynep Yilmazer Hitit; Suna Ertunç
Source:
Journal of food processing and preservation 2021 v.45 no.7 pp. e15625
ISSN:
0145-8892
Subject:
Olea europaea; air; air flow; algorithms; antioxidant activity; chemometrics; least squares; leaves; multi-criteria decision making; oleuropein; olives; pharmaceutical industry; phytochemicals; rehydration; temperature; value added; water content
Abstract:
... Phenolic compounds from olive leaves, which attract great attention with their high phenolic content and high antioxidant activity, need to be dried to increase the extraction efficiency before extraction. For this purpose, it is aimed to obtain optimal drying conditions of hot air inlet temperature (Tg), orifice inlet air flow rate (ν), drying time (t), and rehydration ratio (RR) for moisture rem ...
DOI:
10.1111/jfpp.15625

8. Oxidative stability of ternary blends of vegetable oils: A chemometric approach

Author:
Monalisha Pattnaik; Hari Niwas Mishra
Source:
Lebensmittel-Wissenschaft + Technologie 2021 v.142 pp. 111018
ISSN:
0023-6438
Subject:
activation energy; air; chemometrics; cluster analysis; enthalpy; entropy; linseed oil; lipid peroxidation; nutritive value; oryzanol; oxidative stability; peanut oil; principal component analysis; rancidity; rice bran oil; vegetable oil; vegetables
Abstract:
... Unsaturated fatty acids in vegetable oil are prone to lipid oxidation that leads to rancidity, subsequently, the oil's nutritional value is compromised. Edible oils can be tailored to obtain an antioxidant-rich oil blend with better oxidative stability under accelerated storage conditions. In this research, the oxidative stability of the six oil blends containing rice bran oil (RBO: 50–75%), flaxs ...
DOI:
10.1016/j.lwt.2021.111018

9. Real-time moisture monitoring of edible coated apple chips during hot air drying using miniature NIR spectroscopy and chemometrics

Author:
Ragya Kapoor; Amir Malvandi; Hao Feng; Mohammed Kamruzzaman
Source:
Lebensmittel-Wissenschaft + Technologie 2022 v.154 pp. 112602
ISSN:
0023-6438
Subject:
air; apples; chemometrics; color; flavor; fruits; least squares; models; near-infrared spectroscopy; nutrient content; sugars; vegetables; water content; water uptake
Abstract:
... Fruits and vegetable powders are gaining attention due to their flavor, color, high nutritional content, and consumers’ demand for compact and lightweight foods. This study was undertaken to explore their commercial applications as an edible coating onto sliced apples to incorporate various functional and nutritional characteristics to apple chips. The subsequent aim of this work was to investigat ...
DOI:
10.1016/j.lwt.2021.112602

10. Wastewater monitoring by means of e-nose, VE-tongue, TD-GC-MS, and SPME-GC-MS

Author:
Mohammed Moufid; Michael Hofmann; Nezha El Bari; Carlo Tiebe; Matthias Bartholmai; Benachir Bouchikhi
Source:
Talanta 2021 v.221 pp. 121450
ISSN:
0039-9140
Subject:
air; air pollution; chemometrics; cluster analysis; electrodes; electronic nose; electronic tongue; gas chromatography-mass spectrometry; headspace analysis; industry; information processing; liquids; monitoring; principal component analysis; risk factors; semiconductors; solid phase microextraction; support vector machines; urban areas; voltammetry; wastewater
Abstract:
... The presence of wastewater and air pollution has become an important risk factor for citizens, not only in terms of problems related to health risks, but also because of its negative impact on the country's image. For this reason, malodorous emission monitoring and control techniques are in high demand in urban areas and industries. The aim of this work is first to build an electronic nose (e-nose ...
DOI:
10.1016/j.talanta.2020.121450

11. Chemometrics for environmental monitoring: a review

Author:
Madeleine F. Dupont; Aaron Elbourne; Daniel Cozzolino; James Chapman; Vi Khanh Truong; Russell J. Crawford; Kay Latham
Source:
Analytical methods 2020 v.12 no.38 pp. 4597-4620
ISSN:
1759-9679
Subject:
air; chemometrics; data collection; ecosystems; soil; statistical analysis
Abstract:
... Environmental monitoring is necessary to ensure the overall health and conservation of an ecosystem. However, ecosystems (e.g. air, water, soil), are complex, involving numerous processes (both native and external), inputs, contaminants, and living organisms. As such, monitoring an environmental system is not a trivial task. The data obtained from natural systems is often multifaceted and convolut ...
DOI:
10.1039/d0ay01389g

12. Combining Chemometrics and Sensors: Toward New Applications in Monitoring and Environmental Analysis

Author:
James Chapman; Vi Khanh Truong; Aaron Elbourne; Sheeana Gangadoo; Samuel Cheeseman; Piumie Rajapaksha; Kay Latham; Russell J. Crawford; Daniel Cozzolino
Source:
Chemical reviews 2020 v.120 no.13 pp. 6048-6069
ISSN:
1520-6890
Subject:
air; chemometrics; environmental assessment; marriage; soil
Abstract:
... For many years, an extensive array of chemometric methods have provided a platform upon which a quantitative description of environmental conditions can be obtained. Applying chemometric methods to environmental data allows us to identify and describe the interrelations between certain environmental drivers. They also provide an insight into the interrelationships between these drivers and afford ...
DOI:
10.1021/acs.chemrev.9b00616

13. In-process investigation of the dynamics in drying behavior and quality development of hops using visual and environmental sensors combined with chemometrics

Author:
Barbara Sturm; Sharvari Raut; Boris Kulig; Jakob Münsterer; Klaus Kammhuber; Oliver Hensel; Stuart O.J. Crichton
Source:
Computers and electronics in agriculture 2020 v.175 pp. 105547
ISSN:
0168-1699
Subject:
air; beers; bitterness; brewing; cameras; chemometrics; color; drying; foams; hops; ingredients; mass flow; models; odors; physiology; prediction; processing time; water content; wavelengths
Abstract:
... Hops are a key ingredient for beer brewing due to their role in preservation, the creation of foam characteristics, the bitterness and aroma of the beers. Drying significantly impacts on the composition of hops which directly affects the brewing quality of beers. Therefore, it is pivotal to understand the changes during the drying process to optimize the process with the central aim of improving p ...
DOI:
10.1016/j.compag.2020.105547

14. Non-destructive and online egg freshness assessment from the egg shell based on Raman spectroscopy

Author:
Yuliang Liu; Xiaona Ren; Hang Yu; Yuliang Cheng; Yahui Guo; Weirong Yao; Yunfei Xie
Source:
Food control 2020 v.118 pp. 107426
ISSN:
0956-7135
Subject:
Raman spectroscopy; air; chemometrics; egg shell; eggs; food safety; freshness; models; pH; waist
Abstract:
... Fresh eggs are important to food processing and people consumption. In this study, Raman technique combined with chemometrics method were carried out to monitor egg freshness by scanning external information of egg shell. The Raman spectra were collected from the top, waist, and bottom of 125 eggs’ shell surface monitored for 60 days, respectively. Then the partial least squares regression model o ...
DOI:
10.1016/j.foodcont.2020.107426

15. Tracing the movement of persistent organic pollutants at a high-mountain sampling site by chemometric assessment

Author:
Ekaterina Vakarelska; Miroslava Nedyalkova; Nina Nikolova; Christo Angelov; Dimitar Tonev; Petra Prybilova; Jana Klanova; Vasil Simeonov
Source:
Journal of environmental science and health 2021 v.56 no.9 pp. 1041-1049
ISSN:
1532-4117
Subject:
air; chemometrics; multivariate analysis; pollution; time series analysis; Bulgaria
Abstract:
... The main objective of the present study was to determine and differentiate the concentration levels, to define the probable sources of persistent organic pollutants (POPs) pollution in the atmospheric air and their seasonal variations in Bulgaria, on the high mountain peak Moussala, Rila Mountain. The study was based on the obtained results from the passive monitoring of POPs in 2014–2017. During ...
DOI:
10.1080/10934529.2021.1962674

16. Understanding processing, maturity and harvest period effects to authenticate early-spring Longjing tea using stable isotopes and chemometric analyses

Author:
Wei Xia; Zuguang Li; ChongChong Yu; Zhi Liu; Jing Nie; Chunlin Li; Shengzhi Shao; Yongzhi Zhang; Karyne M. Rogers; Yuwei Yuan
Source:
Food control 2021 v.124 pp. 107907
ISSN:
0956-7135
Subject:
accuracy; air; air temperature; appearance (quality); chemometrics; discriminant analysis; food safety; fractionation; harvest date; humidity; leaves; light intensity; models; prices; risk; spring; stable isotopes; tea
Abstract:
... Low-yielding early-spring (ES) Longjing tea is popular with Chinese consumers and commands a high price due to its scarcity, but it has a heightened risk of substitution with lower value tea products from later harvest periods due to similarities in appearance. In this study, tea samples from different harvest periods were analyzed using stable isotope analyses (δ¹³C, δ¹⁵N, δ²H, and δ¹⁸O) to disti ...
DOI:
10.1016/j.foodcont.2021.107907

17. Writing sequence identification of seals and signatures in documents using ambient mass spectrometry imaging with chemometric methods

Author:
Zhigang Luo; Weixin Wang; Xuechao Pang; Jin Zhang; Chenglong Sun; Xia Zhou; Jiuming He; Ruiping Zhang; Xin Li; Zhe Lian; Zeper Abliz
Source:
Talanta 2021 v.235 pp. 122804
ISSN:
0039-9140
Subject:
air; chemometrics; desorption; discriminant analysis; electrospray ionization mass spectrometry; forensic sciences; ionization; principal component analysis; seals
Abstract:
... Identifying the writing sequence of seals and signatures in documents is often performed and difficult to resolve in forensic determination. Morphological and physical-chemical analysis methods are often limited by the destructive nature of samples, a high signal response strength and specific materials. Mass spectrometry imaging (MSI) has been used as an alternative method because it can generate ...
DOI:
10.1016/j.talanta.2021.122804

18. Belt-Mounted Micro-Gas-Chromatograph Prototype for Determining Personal Exposures to Volatile-Organic-Compound Mixture Components

Author:
Junqi Wang; Nicolas Nuñovero; Robert Nidetz; Seth J. Peterson; Bryan M. Brookover; William H. Steinecker; Edward T. Zellers
Source:
Analytical chemistry 2019 v.91 no.7 pp. 4747-4754
ISSN:
1520-6882
Subject:
air; batteries; calibration; chemometrics; gas chromatography; heaters; nanogold; prototypes; silicon; temperature; volatile organic compounds; working conditions
Abstract:
... We describe a belt-mountable prototype instrument containing a gas chromatographic microsystem (μGC) and demonstrate its capability for near-real-time recognition and quantification of volatile organic compounds (VOCs) in moderately complex mixtures at concentrations encountered in industrial workplace environments. The μGC comprises three discrete, Si/Pyrex microfabricated chips: a dual-adsorbent ...
DOI:
10.1021/acs.analchem.9b00263

19. Chemometric methods for source apportionment of 210Pb, 210Bi and 210Po for 10 years of urban air radioactivity monitoring in Lodz city, Poland

Author:
Magdalena Długosz-Lisiecka
Source:
Chemosphere 2019 v.220 pp. 163-168
ISSN:
0045-6535
Subject:
aerosols; air; chemometrics; cluster analysis; coal; lead; monitoring; particulates; polonium; power plants; principal component analysis; radioactivity; radionuclides; sulfur dioxide; Poland
Abstract:
... The radionuclide activity concentrations of ²¹⁰Pb and its decay products ²¹⁰Bi and ²¹⁰Po were measured in 271 total suspended particulate samples collected from 2008 to 2017 in the center of Lodz city, Poland. Natural and anthropogenic contributions to the observed activities of ²¹⁰Pb, ²¹⁰Bi and ²¹⁰Po radionuclides were estimated. Corrected aerosol residence times were determined for this purpose. ...
DOI:
10.1016/j.chemosphere.2018.12.042

20. Chemometric modeling to predict air half-life of persistent organic pollutants (POPs)

Author:
Pathan Mohsin Khan; Diego Baderna; Anna Lombardo; Kunal Roy; Emilio Benfenati
Source:
Journal of hazardous materials 2020 v.382 pp. 121035
ISSN:
0304-3894
Subject:
air; chemometrics; data collection; half life; halogens; least squares; lipophilicity; models; organic compounds; persistent organic pollutants; prediction; quantitative structure-activity relationships; variance
Abstract:
... We have reported here a quantitative structure-property relationship (QSPR) model for prediction of air half-life of organic chemicals using a dataset of 302 diverse organic chemicals employing only two-dimensional descriptors with definite physicochemical meaning in order to avoid the computational complexity for higher dimensional molecular descriptors. The developed model was rigorously validat ...
DOI:
10.1016/j.jhazmat.2019.121035

21. Comparative evaluation of volatile profile of tomato subjected to hot air, freeze, and spray drying

Author:
Gomathi Rajkumar; Murugan Rajan; H.C. Araujo; M.S. Jesus; M.T.S. Leite Neta; R.D.D. Sandes; Narendra Narain
Source:
Drying technology 2020 v.39 no.3 pp. 383-391
ISSN:
1532-2300
Subject:
Solanum lycopersicum var. lycopersicum; acetaldehyde; acetates; air; chemometrics; cluster analysis; consumer acceptance; dimethyl sulfide; freeze drying; headspace analysis; hexanols; hydroxymethylfurfural; odors; postharvest losses; principal component analysis; solid phase microextraction; tomatoes; vegetable crops; volatile compounds
Abstract:
... Tomato (Lycopersicon esculentum Mill.) is an important vegetable crop cherished all over the world for consumption as a raw vegetable or as processed products. They are subjected to various drying processes to increase product stability and decrease postharvest loss. However, this can cause a loss in volatile compounds due to process conditions. Present study aims to gain an insight into the volat ...
DOI:
10.1080/07373937.2020.1842441

22. Detection of Microplastics in Ambient Particulate Matter Using Raman Spectral Imaging and Chemometric Analysis

Author:
Joseph M. Levermore; Thomas E. L. Smith; Frank J. Kelly; Stephanie L. Wright
Source:
Analytical chemistry 2020 v.92 no.13 pp. 8732-8740
ISSN:
1520-6882
Subject:
air; automation; chemical composition; chemometrics; cluster analysis; humans; lungs; microplastics; particulates; spectral analysis; spectroscopy; toxicology; United Kingdom
Abstract:
... Microplastics have been observed in indoor and outdoor air. This raises concern for human exposure, especially should they occur in small enough sizes, which if inhaled, reach the central airway and distal lung. As yet, methods for their detection have not spectroscopically verified the chemical composition of microplastics in this size-range. One proposed method is an automated spectroscopic tech ...
DOI:
10.1021/acs.analchem.9b05445

23. Evaluation of volatile organic compounds coupled to seasonality effects in indoor air from a commercial office in Madrid (Spain) applying chemometric techniques

Author:
Camila R. de O. Nunes; Benigno Sánchez; Carlos E.N. Gatts; Cibele M.S. de Almeida; Maria C. Canela
Source:
Science of the total environment 2019 v.650 pp. 868-877
ISSN:
0048-9697
Subject:
air; air pollution; benzene; chemometrics; chronic exposure; coatings; desorption; furniture; gas chromatography; humidity; laws and regulations; multivariate analysis; seasonal variation; spectrometers; stainless steel; temperature; volatile organic compounds; Spain
Abstract:
... Volatile organic compounds (VOCs) concentrations depend on several sources and factors, such as temperature, ventilation, and humidity. Sources can be external atmospheric pollution or indoor release from furniture, coatings or occupants. In this context, this study focused on quantification of VOCs present in a confined atmosphere in a commercial office in downtown Madrid, Spain. The influence of ...
DOI:
10.1016/j.scitotenv.2018.09.095

24. An investigation of inactivation mechanisms of Bacillus amyloliquefaciens spores in non‐thermal plasma of ambient air

Author:
Yaohua Huang; Xiaofei P Ye; Christopher J Doona; Florence E Feeherry; Mark Radosevich; Siqun Wang
Source:
Journal of the science of food and agriculture 2019 v.99 no.1 pp. 368-378
ISSN:
0022-5142
Subject:
Bacillus amyloliquefaciens; Fourier transform infrared spectroscopy; air; atomic force microscopy; chemometrics; cortex; food safety; kinetics; lipids; nuclear magnetic resonance spectroscopy; reflectance; sanitation; scanning electron microscopy; spores; structural proteins
Abstract:
... BACKGROUND: To utilize the potential of non‐thermal plasma technologies for food safety control and sanitation, the inactivation mechanisms of Bacillus amyloliquefaciens spores by non‐thermal plasma of ambient air (NTP‐AA) were investigated using scanning electron microscopy, atomic force microscopy, attenuated total reflectance Fourier transform infrared spectroscopy with chemometric analysis and ...
DOI:
10.1002/jsfa.9198

25. Chemometric Approach to the Calibration of Light Emitting Diode Based Optical Gas Sensors Using High-Resolution Transmission Molecular Absorption Data

Author:
Parvez Mahbub; John Leis; Mirek Macka
Source:
Analytical chemistry 2018 v.90 no.10 pp. 5973-5976
ISSN:
1520-6882
Subject:
absorbance; absorption; air; chemometrics; databases; emissions; light emitting diodes; methane; models; near-infrared spectroscopy; wavelengths
Abstract:
... Modeling the propagation of light from LED sources is problematic since the emission covers a broad range of wavelengths and thus cannot be considered as monochromatic. Furthermore, the lack of directivity of such sources is also problematic. Both attributes are characteristic of LEDs. Here we propose a HITRAN (high-resolution transmission molecular absorption database) based chemometric approach ...
DOI:
10.1021/acs.analchem.8b01295

26. Determination of six veterinary pharmaceuticals in egg by liquid chromatography: Chemometric optimization of a novel air assisted-dispersive liquid-liquid microextraction by solid floating organic drop

Author:
Carla M. Teglia; Lucia Gonzalo; María J. Culzoni; Héctor C. Goicoechea
Source:
Food chemistry 2019 v.273 pp. 194-202
ISSN:
0308-8146
Subject:
acetonitrile; air; albendazole; chemometrics; chloramphenicol; eggs; enrofloxacin; liquid chromatography; liquid-phase microextraction; methanol; methylene chloride; nicarbazin; pH; sodium phosphate; solidification; solvents; trimethoprim; veterinary drugs; zinc sulfate
Abstract:
... Two extraction strategies for albendazole, chloramphenicol, trimethoprim, enrofloxacin, oxitetracycline and nicarbazin in egg were optimized for its quantitation by liquid chromatography. First, two designs were built to find out the optimized condition for the air assisted-dispersive liquid-liquid microextraction based on solidification of organic drop: a fractional factorial and a central compos ...
DOI:
10.1016/j.foodchem.2017.08.034

27. Determination of the superficial citral content on microparticles: An application of NIR spectroscopy coupled with chemometric tools

Author:
Ives Yoplac; Himer Avila-George; Luis Vargas; Paz Robert; Wilson Castro
Source:
Heliyon 2019 v.5 no.7 pp. e02122
ISSN:
2405-8440
Subject:
absorption; air; chemometrics; citral; data collection; dextrins; near-infrared spectroscopy; neural networks; prediction
Abstract:
... This work evaluates near-infrared (NIR) spectroscopy coupled with chemometric tools for determining the superficial content of citral (SCCt) on microparticles. To perform this evaluation, using spray drying, citral was encapsulated in a matrix of dextrin using twelve combinations of citral:dextrin ratios (CDR) and inlet air temperatures (IAT). From each treatment, six samples were extracted, and t ...
DOI:
10.1016/j.heliyon.2019.e02122
PubMed:
31388576
PubMed Central:
PMC6675954

28. Near-infrared spectroscopy (NIRS) as a tool to monitor exhaust air from poultry operations

Author:
Katharina Druckenmüller; Klaus Günther; Gereon Elbers
Source:
Science of the total environment 2018 v.630 pp. 536-543
ISSN:
0048-9697
Subject:
air; chemometrics; cleaning; data collection; discriminant analysis; dust; exhaust systems; factor analysis; finishing; monitoring; multivariate analysis; near-infrared spectroscopy; organic matter; poultry; poultry housing; principal component analysis; process control
Abstract:
... Intensive poultry operation systems emit a considerable volume of inorganic and organic matter in the surrounding environment. Monitoring cleaning properties of exhaust air cleaning systems and to detect small but significant changes in emission characteristics during a fattening cycle is important for both emission and fattening process control. In the present study, we evaluated the potential of ...
DOI:
10.1016/j.scitotenv.2018.02.072

29. Removal of volatile gasoline compounds by indoor potted plants studied by pixel-based fingerprinting analysis

Author:
Majbrit Dela Cruz; Giorgio Tomasi; Renate Müller; Jan H. Christensen
Source:
Chemosphere 2019 v.221 pp. 226-234
ISSN:
0045-6535
Subject:
Hedera helix; air; chemometrics; container-grown plants; ethylbenzene; gasoline; heptane; microorganisms; quantitative analysis; roots; soil; soil ecology; toluene; volatile organic compounds
Abstract:
... Indoor potted plants are able to remove volatile organic compounds (VOC) from air, but only few studies have investigated the removal of compounds in mixtures. Here, we present a non-targeted pixel-based fingerprinting analysis documenting the removal of a complex mixture of gasoline VOCs by Hedera helix under dynamic chamber conditions allowing for air exchange and continuous gasoline exposure. F ...
DOI:
10.1016/j.chemosphere.2018.12.125

30. UV-Raman Spectroscopic Identification of Fungal Spores Important for Respiratory Diseases

Author:
Olga Žukovskaja; Sandra Kloß; Matthew G. Blango; Oleg Ryabchykov; Olaf Kniemeyer; Axel A. Brakhage; Thomas W. Bocklitz; Dana Cialla-May; Karina Weber; Jürgen Popp
Source:
Analytical chemistry 2018 v.90 no.15 pp. 8912-8918
ISSN:
1520-6882
Subject:
Aspergillus fumigatus; air; allergens; aspergillosis; asthma; chemometrics; color; discriminant analysis; environmental factors; fungal spores; fungi; health hazards; models; mycotoxins; principal component analysis; spectroscopy; wavelengths
Abstract:
... Fungal spores are one of several environmental factors responsible for causing respiratory diseases like asthma, chronic obstructive pulmonary disease (COPD), and aspergillosis. These spores also are able to trigger exacerbations during chronic forms of disease. Different fungal spores may contain different allergens and mycotoxins, therefore the health hazards are varying between the species. Thu ...
DOI:
10.1021/acs.analchem.8b01038

31. Estimation of the late postmortem interval using FTIR spectroscopy and chemometrics in human skeletal remains

Author:
Qi Wang; Yinming Zhang; Hancheng Lin; Shuai Zha; Ruoxi Fang; Xin Wei; Shuanliang Fan; Zhenyuan Wang
Source:
Forensic science international 2017 v.281 pp. 113-120
ISSN:
0379-0738
Subject:
Fourier transform infrared spectroscopy; air; algorithms; bones; chemometrics; fatty acids; forensic sciences; humans; least squares; medicine; postmortem changes; prediction; principal component analysis; proteins; soil
Abstract:
... Due to a lack of reliable and accurate methods, determining the postmortem interval (PMI) of human skeletal remains is one of the most important and challenging tasks in forensic medicine. In this paper, we studied the changes to bone chemistry with increasing PMI in two different experimental conditions using Fourier transform infrared (FTIR) spectroscopy in conjunction with chemometrics methods ...
DOI:
10.1016/j.forsciint.2017.10.033

32. LIBS development methodology for forensic nuclear materials analysis

Author:
Bobby Bhatt; Kalambuka Hudson Angeyo; Alix Dehayem-Kamadjeu
Source:
Analytical methods 2018 v.10 no.7 pp. 791-798
ISSN:
1759-9679
Subject:
air; algorithms; atmospheric pressure; atomic absorption spectrometry; cellulose; chemometrics; detection limit; forensic sciences; neural networks; prediction; principal component analysis; reference standards; source attribution; uranium; Kenya
Abstract:
... Nuclear forensics (NF) is an important tool for the analysis of intercepted nuclear and radiological materials (NRM) to establish the relationship between NRM and their attribution in support of nuclear security. The critical challenge in NF at present is the lack of direct, rapid and non-invasive analytical techniques, especially for concealed and limited size NRM. Laser induced breakdown spectro ...
DOI:
10.1039/c7ay02520c

33. Recent changes in the oxidized to reduced nitrogen ratio in atmospheric precipitation

Author:
Iwona Kurzyca; Marcin Frankowski
Source:
Atmospheric environment 2017 v.167 pp. 642-655
ISSN:
1352-2310
Subject:
air; ammonium; atmospheric chemistry; chemometrics; meteorology; nitrate nitrogen; nitrates; nitrite nitrogen; nitrites; nitrogen; pollutants; rain; thermodynamics; urban areas; woodlands; Poland
Abstract:
... In this study, the characteristics of precipitation in terms of various nitrogen forms (NO3⁻, NO2⁻, NH4⁺, Norganic, Ntotal) is presented. The samples were collected in the areas of different anthropogenic pressure (urban area vs. ecologically protected woodland area, ∼30 km distant from each other; Wielkopolska region, Poland). Based on the Nox and Nred emission profiles (Nox/Nred ratio), temporal ...
DOI:
10.1016/j.atmosenv.2017.08.026

34. Spectrally resolved infrared microscopy and chemometric tools to reveal the interaction between blue light (470nm) and methicillin-resistant Staphylococcus aureus

Author:
Violet V. Bumah; Ebrahim Aboualizadeh; Daniela S. Masson-Meyers; Janis T. Eells; Chukuka S. Enwemeka; Carol J. Hirschmugl
Source:
Journal of photochemistry and photobiology 2017 v.167 pp. 150-157
ISSN:
1011-1344
Subject:
A-DNA; B-DNA; DNA conformation; Fourier transform infrared spectroscopy; air; antibacterial properties; antibiotic resistance; apoptosis; bacteria; blue light; chemometrics; death; discriminant analysis; irradiation; lipids; mechanism of action; methicillin; methicillin-resistant Staphylococcus aureus; microscopy; principal component analysis; proteins; ultraviolet radiation; vancomycin; vibration
Abstract:
... Blue light inactivates methicillin-resistant Staphylococcus aureus (MRSA), a Gram-positive antibiotic resistant bacterium that leads to fatal infections; however, the mechanism of bacterial death remains unclear. In this paper, to uncover the mechanism underlying the bactericidal effect of blue light, a combination of Fourier transform infrared (FTIR) spectroscopy and chemometric tools is employed ...
DOI:
10.1016/j.jphotobiol.2016.12.030

35. A chemometrics approach applied to Fourier transform infrared spectroscopy (FTIR) for monitoring the spoilage of fresh salmon (Salmo salar) stored under modified atmospheres

Author:
C. Saraiva; H. Vasconcelos; José M.M.M. de Almeida
Source:
International journal of food microbiology 2017 v.241 pp. 331-339
ISSN:
0168-1605
Subject:
Brochothrix thermosphacta; Enterobacteriaceae; Fourier transform infrared spectroscopy; Photobacterium phosphoreum; Pseudomonas; Salmo salar; air; chemometrics; discriminant analysis; fish fillets; freshness; hydrogen sulfide; lactic acid bacteria; least squares; lemon juice; microbial load; modified atmosphere packaging; molds (fungi); monitoring; pH; plate count; prediction; psychrotrophic bacteria; salmon; sensory evaluation; spectral analysis; spoilage; temperature; yeasts
Abstract:
... The aim of this work was to investigate the potential of Fourier transform infrared spectroscopy (FTIR) to detect and predict the bacterial load of salmon fillets (Salmo salar) stored at 3, 8 and 30°C under three packaging conditions: air packaging (AP) and two modified atmospheres constituted by a mixture of 50%N2/40%CO2/10%O2 with lemon juice (MAPL) and without lemon juice (MAP).Fresh salmon sam ...
DOI:
10.1016/j.ijfoodmicro.2016.10.038

36. A FTIR/chemometrics approach to characterize the gamma radiation effects on iodine/epoxy-paint interactions in Nuclear Power Plants

Author:
Juliette Colombani; Elodie Chauvet; Sandrine Amat; Nathalie Dupuy; Didier Gigmes
Source:
Analytica chimica acta 2017 pp. -
ISSN:
0003-2670
Subject:
Fourier transform infrared spectroscopy; air; buildings; chemometrics; epoxides; gamma radiation; iodine; nuclear fuels; nuclear power; nuclear power industry; polymers; power plants; radionuclides
Abstract:
... The effects of radiation on polymeric materials are a topic of concern in a wide range of industries including the sterilization, and the nuclear power industry. While much work has concentrated on systems like polyolefins that are radiation sterilized, some work has been done on epoxy systems. The epoxy system studied is an epoxy/amine paint which is representative of the paint that covers the in ...
DOI:
10.1016/j.aca.2017.01.005

37. Urban air quality assessment using monitoring data of fractionized aerosol samples, chemometrics and meteorological conditions

Author:
Galina I. Yotova; Roxani Tsitouridou; Stefan L. Tsakovski; Vasil D. Simeonov
Source:
Journal of environmental science and health 2016 v.51 no.7 pp. 544-552
ISSN:
1532-4117
Subject:
aerosols; air; air quality; anthropogenic activities; chemometrics; cluster analysis; combustion; data collection; emissions; models; monitoring; multivariate analysis; pollutants; principal component analysis; soil; weather; Central European region; Greece; Southern Africa; Southern European region
Abstract:
... The present article deals with assessment of urban air by using monitoring data for 10 different aerosol fractions (0.015–16 μm) collected at a typical urban site in City of Thessaloniki, Greece. The data set was subject to multivariate statistical analysis (cluster analysis and principal components analysis) and, additionally, to HYSPLIT back trajectory modeling in order to assess in a better way ...
DOI:
10.1080/10934529.2016.1141620

38. The effect of anthropogenic activity on BTEX, NO2, SO2, and CO concentrations in urban air of the spa city of Sopot and medium-industrialized city of Tczew located in North Poland

Author:
Mariusz Marć; Michalina Bielawska; Vasil Simeonov; Jacek Namieśnik; Bożena Zabiegała
Source:
Environmental research 2016 v.147 pp. 513-524
ISSN:
0013-9351
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); air; air quality; anthropogenic activities; benzene; carbon monoxide; chemometrics; cluster analysis; emissions; ethylbenzene; nitrogen dioxide; pollutants; principal component analysis; samplers; sulfur dioxide; toluene; urban areas; xylene; Poland
Abstract:
... The major goal of the present study is to compare the air quality of two urban locations situated in Northern Poland – the spa City of Sopot and the medium-industrialized city of Tczew using chemometric methods. As a criterion for the assessment of atmospheric air quality, measurements of benzene, toluene, ethylbenzene and total xylenes were used (collected from atmospheric air using diffusion-typ ...
DOI:
10.1016/j.envres.2016.03.014

39. Use of Sensory Analysis Methods to Evaluate the Odor of Food and Outside Air

Author:
Paulina Lewkowska; Tomasz Dymerski; Jacek NamieśNik
Source:
Critical reviews in environmental science and technology 2015 v.45 no.20 pp. 2208-2244
ISSN:
1547-6537
Subject:
air; chemometrics; foods; odors; sensory evaluation
Abstract:
... Sensory analysis is applied in many areas of daily life. It is used to carry out the sensory evaluation of foodstuffs or other products and to evaluate the properties of odors present in the environment. The authors attempt to summarize the knowledge on the classification and application of sensory analysis methods to evaluate the odor nuisance of air, which allows the identification of sensory im ...
DOI:
10.1080/10643389.2015.1010429

40. The effect of climate and meteorological changes on particulate matter in Pune, India

Author:
Suman Yadav; O. Divya Praveen; P. Gursumeeran Satsangi
Source:
Environmental monitoring and assessment 2015 v.187 no.7 pp. 402
ISSN:
0167-6369
Subject:
air; chemometrics; climate; least squares; meteorological data; meteorological parameters; model validation; models; monsoon season; particulates; prediction; sampling; summer; winter; India
Abstract:
... This paper presents the distinctiveness of particulate matter (PM) mass concentrations (PM₁₀, PM₂.₅, and PM₁₀₋₂.₅) and meteorological effect in Pune city during 2011–2012. The PM samples were collected using Mini-Vol TAS air sampler (Airmetrics Co. Inc., 5 l min⁻¹ flow rate). The meteorological parameters were also measured during the study period. The analysis of 24-h average PM₁₀, PM₂.₅, and PM₁ ...
DOI:
10.1007/s10661-015-4634-z

41. Data Size Reduction Strategy for the Classification of Breath and Air Samples Using Multicapillary Column-Ion Mobility Spectrometry

Author:
Szymańska Ewa; Brodrick Emma; Williams Mark; Davies Antony N.; van Manen Henk-Jan; Buydens Lutgarde M. C.
Source:
Analytical chemistry 2015 v.87 no.2 pp. 869-875
ISSN:
1520-6882
Subject:
air; biomarkers; chemometrics; discriminant analysis; instrumentation; models; spectroscopy; volatile organic compounds; wavelet
Abstract:
... Ion mobility spectrometry combined with multicapillary column separation (MCC-IMS) is a well-known technology for detecting volatile organic compounds (VOCs) in gaseous samples. Due to their large data size, processing of MCC-IMS spectra is still the main bottleneck of data analysis, and there is an increasing need for data analysis strategies in which the size of MCC-IMS data is reduced to enable ...
DOI:
10.1021/ac503857y

42. Evaluation of the Spoilage of Raw Chicken Breast Fillets Using Fourier Transform Infrared Spectroscopy in Tandem with Chemometrics

Author:
Helena Vasconcelos; Cristina Saraiva; José M. M. M. de Almeida
Source:
Food and bioprocess technology 2014 v.7 no.8 pp. 2330-2341
ISSN:
1935-5130
Subject:
Brochothrix thermosphacta; Enterobacteriaceae; Fourier transform infrared spectroscopy; Pseudomonas; air; amides; amines; breasts; chemometrics; chickens; correlation; discriminant analysis; fillets; freshness; lactic acid bacteria; least squares; meat carcasses; models; pH; prediction; principal component analysis; raw chicken meat; spectral analysis; spoilage
Abstract:
... The aim of this work was to evaluate the potential of Fourier transform infrared (FTIR) spectroscopy as a rapid and accurate technique to detect and predict the onset of spoilage in fresh chicken breast fillets stored at 3, 8, and 30 °C. Chicken breasts were excised from carcasses at 6 h post-mortem; cut in fillets; packed in air; stored at 3, 8, and 30 ºC; and periodically examined for FTIR, pH, ...
DOI:
10.1007/s11947-014-1277-y

43. NIR spectroscopy as a tool for discriminating between lichens exposed to air pollution

Author:
Monica Casale; Lucia Bagnasco; Paolo Giordani; Mauro Giorgio Mariotti; Paola Malaspina
Source:
Chemosphere 2015 v.134 pp. 355-360
ISSN:
0045-6535
Subject:
air; air pollution; atmospheric chemistry; chemometrics; discriminant analysis; lichens; near-infrared spectroscopy; pollutants; prediction; principal component analysis
Abstract:
... Lichens are used as biomonitors of air pollution because they are extremely sensitive to the presence of substances that alter atmospheric composition. Fifty-one thalli of two different varieties of Pseudevernia furfuracea (var. furfuracea and var. ceratea) were collected far from local sources of air pollution. Twenty-six of these thalli were then exposed to the air for one month in the industria ...
DOI:
10.1016/j.chemosphere.2015.03.095

44. Online acoustic chemometric monitoring of fish feed pellet velocity in a pneumatic conveying system

Author:
Maths Halstensen; Felicia Nkem Ihunegbo; Chandana Ratnayake; Karl Sveinsvold
Source:
Powder technology 2014 v.263 pp. 104-111
ISSN:
0032-5910
Subject:
acoustics; air; chemometrics; conveyors; crushing; farmers; financial economics; fish; fish culture; fish feeds; least squares; model validation; models; monitoring; pelleted feeds; pellets; powders; prediction; vibration
Abstract:
... Fish farmers consider the cost of fish feed pellets as one of the most expensive factors in fish cultivation. Proper control of the handling and conveying systems is necessary to avoid damage and disintegration of the cylindrically shaped fish feed pellets. Pneumatic conveying is widely used to transport large quantities of fish feed. Proneness of crushing the fish feed pellets caused by pellets i ...
DOI:
10.1016/j.powtec.2014.05.007

45. Relationship between geographical origin and contents of Pb, Cd, and Cr in honey samples from the state of Paraná (Brazil) with chemometric approach

Author:
Camila Kulek de Andrade; Vanessa Egéa dos Anjos; Maria Lurdes Felsner; Yohandra Reyes Torres; Sueli Pércio Quináia
Source:
Environmental science and pollution research international 2014 v.21 no.21 pp. 12372-12381
ISSN:
0944-1344
Subject:
air; anthropogenic activities; atomic absorption spectrometry; cadmium; chemometrics; chromium; honey; indicator species; lead; principal component analysis; provenance; slurries; soil pollution; Brazil
Abstract:
... The aim of this study was to determine the trace elements, Pb, Cd, and Cr in honey samples from eight different regions from the state of Paraná (Brazil), using slurry sampling graphite furnace atomic absorption spectrometry. Chemometric analysis (principal component analysis (PCA)) was applied to classify honey samples according to their levels of the trace elements Pb, Cd, and Cr, which is also ...
DOI:
10.1007/s11356-014-3175-2
PubMed:
24938816

46. ATR-FTIR spectroscopy for the determination of Na₄EDTA in detergent aqueous solutions

Author:
Leticia Suárez; Roberto García; Francisco A. Riera; María A. Diez
Source:
Talanta 2013 v.115 no. pp. 652-656
ISSN:
0039-9140
Subject:
Fourier transform infrared spectroscopy; absorbance; air; algorithms; aqueous solutions; chemometrics; detection limit; detergents; high performance liquid chromatography; models; prediction; reflectance
Abstract:
... Fourier transform infrared spectroscopy in the attenuated total reflectance mode (ATR-FTIR) combined with partial last square (PLS) algorithms was used to design calibration and prediction models for a wide range of tetrasodium ethylenediaminetetraacetate (Na₄EDTA) concentrations (0.1 to 28% w/w) in aqueous solutions. The spectra obtained using air and water as a background medium were tested for ...
DOI:
10.1016/j.talanta.2013.06.020

47. Adaptive plasticity of Laguncularia racemosa in response to different environmental conditions: integrating chemical and biological data by chemometrics

Author:
Iara da Souza; Marina Marques Bonomo; Mariana Morozesk; Lívia Dorsch Rocha; Ian Drumond Duarte; Larissa Maria Furlan; Hiulana Pereira Arrivabene; Magdalena Victoria Monferrán; Silvia Tamie Matsumoto; Camilla Rozindo Dias Milanez; Daniel Alberto Wunderlin; Marisa Narciso Fernandes
Source:
Ecotoxicology 2014 v.23 no.3 pp. 335-348
ISSN:
0963-9292
Subject:
Laguncularia racemosa; air; chemometrics; cortex; discriminant analysis; environmental factors; estuaries; histochemistry; leaves; metals; oxygen; periderm; pollutants; roots; sediments; Brazil
Abstract:
... Mangroves are dynamic environments under constant influence of anthropic contaminants. The correlation between environmental contamination levels and possible changes in the morphology of plants, evaluated by multivariate statistics helps to highlight matching between these variables. This study aimed to evaluate the uptake and translocation of metals and metalloids in roots and leaves as well as ...
DOI:
10.1007/s10646-014-1191-0
PubMed:
24445776

48. Environmental toxicological fate prediction of diverse organic chemicals based on steady-state compartmental chemical mass ratio using quantitative structure–fate relationship (QSFR) models

Author:
Subrata Pramanik; Kunal Roy
Source:
Chemosphere 2013 v.92 pp. 600-607
ISSN:
0045-6535
Subject:
air; chemometrics; diffusivity; ecosystems; emissions; least squares; linear models; organic compounds; partition coefficients; prediction; vapor pressure
Abstract:
... Four quantitative prediction models for steady-state compartmental chemical mass concentrations (Wn,g) were obtained from structural information, physiochemical properties, degradation rate and transport coefficients of 455 diverse organic chemicals using chemometric tools in a quantitative structure–fate relationship (QSFR) study. The mass ratio assessment of environmentally prevalent organic che ...
DOI:
10.1016/j.chemosphere.2013.03.065
PubMed:
23642702

49. Determining the influence of different atmospheric circulation patterns on PM₁₀ chemical composition in a source apportionment study

Author:
Mauro Masiol; Stefania Squizzato; Daniele Ceccato; Giancarlo Rampazzo; Bruno Pavoni
Source:
Atmospheric environment 2012 v.63 no. pp. 117-124
ISSN:
1352-2310
Subject:
air; air pollution; air temperature; atmospheric chemistry; atmospheric circulation; chemometrics; combustion; elemental composition; inorganic ions; models; nitrates; particulates; pollutants; pollution control; relative humidity; traffic; water quality; wind speed; Italy; Mediterranean region; Northern European region
Abstract:
... This study combines a set of chemometric analyses with a source apportionment model for discriminating the weather conditions, local processes and remote contributions having an impact on particulate matter levels and chemical composition. The proposed approach was tested on PM₁₀ data collected in a semi-rural coastal site near Venice (Italy). The PM₁₀ mass, elemental composition and the water sol ...
DOI:
10.1016/j.atmosenv.2012.09.025

50. Ion Mobility Spectrometry: A Comprehensive and Versatile Tool for Occupational Pharmaceutical Exposure Assessment

Author:
Armenta S.; Blanco M.
Source:
Analytical chemistry 2012 v.84 no.10 pp. 4560-4568
ISSN:
1520-6882
Subject:
air; chemometrics; cost analysis; desorption; exposure assessment; human resources; ingredients; ionization; monitoring; occupational exposure; pharmaceutical industry; spectroscopy; working conditions
Abstract:
... The qualitative and quantitative capabilities of ion mobility spectrometry (IMS) as a comprehensive and powerful tool in workplace air monitoring have been demonstrated on the example of a Spanish pharmaceutical company. The developed IMS based procedure is capable of detecting and determining in air samples the active pharmaceutical ingredients (APIs) manipulated and/or produced in this pharmaceu ...
DOI:
10.1021/ac300655t

51. Determination of volatile organic compounds as biomarkers of lung cancer by SPME–GC–TOF/MS and chemometrics

Author:
Joanna Rudnicka; Tomasz Kowalkowski; Tomasz Ligor; Bogusław Buszewski
Source:
Journal of chromatography 2011 v.879 no.30 pp. 3360-3366
ISSN:
1570-0232
Subject:
air; biomarkers; breath tests; chemometrics; chromatography; detection limit; humans; lung neoplasms; quantitative analysis; rapid methods; screening; solid phase microextraction; spectroscopy; statistical analysis; volatile organic compounds
Abstract:
... A method for qualitative and quantitative the determination of concentrations volatile organic compounds (VOCs) in human breath samples using solid phase microextraction (SPME) and gas chromatography–time of flight–mass spectrometry (GC–TOF/MS) has been carried out. They are employed for the preconcentration, separation and analysis of biological samples. The technique to rapid determination compo ...
DOI:
10.1016/j.jchromb.2011.09.001

52. GC-MS analyses and chemometric processing to discriminate the local and long-distance sources of PAHs associated to atmospheric PM2.5

Author:
Mauro Masiol; Elena Centanni; Stefania Squizzato; Angelika Hofer; Eliana Pecorari; Giancarlo Rampazzo; Bruno Pavoni
Source:
Environmental science and pollution research international 2012 v.19 no.8 pp. 3142-3151
ISSN:
0944-1344
Subject:
air; air pollution control; atmospheric circulation; chemometrics; cluster analysis; discriminant analysis; factor analysis; pollutants; research; wind; Italy
Abstract:
... PURPOSE: This study presents a procedure to differentiate the local and remote sources of particulate-bound polycyclic aromatic hydrocarbons (PAHs). METHODS: Data were collected during an extended PM2.5 sampling campaign (2009–2010) carried out for 1 year in Venice-Mestre, Italy, at three stations with different emissive scenarios: urban, industrial, and semirural background. Diagnostic ratios and ...
DOI:
10.1007/s11356-012-0858-4

53. Near real time detection of hazardous airborne substances

Author:
J. Leppert; G. Horner; F. Rietz; J. Ringer; P. Schulze Lammers; P. Boeker
Source:
Talanta 2012 v.101 no. pp. 440-446
ISSN:
0039-9140
Subject:
air; chemometrics; detection limit; gas chromatography; monitoring; nerve tissue; organophosphorus compounds; spectrometers
Abstract:
... A fast near real-time monitoring system for hazardous airborne substances, such as chemical warfare agents (CWA) is presented and limits of detection (LOD) for five CW simulants are determined. A tandem thermal desorber (TTD) continuously collects and pre-concentrates air. The pre-concentrated samples are then separated in a fast gas chromatographic (GC) run of 6.9min. and detected by a time-of-fl ...
DOI:
10.1016/j.talanta.2012.09.056

54. Use of thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) on identification of odorant emission focus by volatile organic compounds characterisation

Author:
Carlos Rodríguez-Navas; Rafael Forteza; Víctor Cerdà
Source:
Chemosphere 2012 v.89 no.11 pp. 1426-1436
ISSN:
0045-6535
Subject:
air; ambient temperature; chemometrics; detection limit; gas chromatography; mass spectrometry; methanol; municipal solid waste; odor compounds; organic wastes; sludge; terpenoids; volatile organic compounds; wastewater; Spain
Abstract:
... Volatile organic compounds (VOCs) from several different municipal solid wastes’ treatment plants in Mallorca (Spain) have been analysed by thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS). Ambient (immission) air was collected during February and March 2011 by active sampling onto sorbents Tenax™ TA and Carboxen™ 1000. The study presents the chemical characterisation of 93 volat ...
DOI:
10.1016/j.chemosphere.2012.06.013
PubMed:
22776256

55. Laser-induced breakdown spectroscopy for detection of explosives residues: a review of recent advances, challenges, and future prospects

Author:
Gottfried, Jennifer L.; De Lucia, Frank C. Jr; Munson, Chase A.; Miziolek, Andrzej W.
Source:
Analytical and bioanalytical chemistry 2009 v.395 no.2 pp. 283-300
ISSN:
1618-2642
Subject:
air; chemometrics; discriminant analysis; explosives; instrumentation; lasers; least squares; researchers; solutions; spectroscopy
Abstract:
... In this review we discuss the application of laser-induced breakdown spectroscopy (LIBS) to the problem of detection of residues of explosives. Research in this area presented in open literature is reviewed. Both laboratory and field-tested standoff LIBS instruments have been used to detect explosive materials. Recent advances in instrumentation and data analysis techniques are discussed, includin ...
DOI:
10.1007/s00216-009-2802-0

56. Chemosensors in environmental monitoring: challenges in ruggedness and selectivity

Author:
Lieberzeit, Peter A.; Dickert, Franz L.
Source:
Analytical and bioanalytical chemistry 2009 v.393 no.2 pp. 467-472
ISSN:
1618-2642
Subject:
air; chemometrics; environmental assessment; environmental monitoring; molecular imprinting; polymers
Abstract:
... Environmental analysis is a potential key application for chemical sensors owing to their inherent ability to detect analytes on-line and in real time in distributed systems. Operating a chemosensor in a natural environment poses substantial challenges in terms of ruggedness, long-term stability and calibration. This article highlights current trends of achieving both the necessary selectivity and ...
DOI:
10.1007/s00216-008-2464-3
PubMed:
18982316

57. Effect of emodin on Candida albicans growth investigated by microcalorimetry combined with chemometric analysis

Author:
W. J. Kong; J. B. Wang; C. Jin; Y. L. Zhao; C. M. Dai; X. H. Xiao; Z. L. Li
Source:
Applied microbiology and biotechnology 2009 v.83 no.6 pp. 1183-1190
ISSN:
0175-7598
Subject:
Candida albicans; air; chemometrics; drugs; emodin; fungi; heat; metabolism; principal component analysis
Abstract:
... Using the 3114/3115 thermal activity monitor (TAM) air isothermal microcalorimeter, ampoule mode, the heat output of Candida albicans growth at 37°C was measured, and the effect of emodin on C. albicans growth was evaluated by microcalorimetry coupled with chemometric methods. The similarities between the heat flow power (HFP)–time curves of C. albicans growth affected by different concentrations ...
DOI:
10.1007/s00253-009-2054-0
PubMed:
19543891

58. Usefulness of near infrared spectroscopy to monitor the extent of heat treatment in fish meal

Author:
Cozzolino, Daniel; Chree, Allison; Murray, Ian; Scaife, Jeff R.
Source:
International journal of food science & technology 2009 v.44 no.8 pp. 1579-1584
ISSN:
0950-5423
Subject:
air; chemometrics; discriminant analysis; fish meal; heat treatment; least squares; models; near-infrared spectroscopy; principal component analysis; reflectance; temperature
Abstract:
... The objective of this study was to explore the use of near infrared (NIR) spectroscopy and chemometrics to monitor the degree of heat treatment of fish meal. Six batches of fish meal (approximately 500 g) were split in sub-samples of 50 g and heated at constant temperature (60 ± 5 °C) for different periods of time (15 and 30 min, 1, 2, 3, 4, 5, 6, 8, 48 and 72 h) in a force air oven and scanned in ...
DOI:
10.1111/j.1365-2621.2008.01845.x