U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Publication year rev 7986-2014 Remove constraint Publication year rev: 7986-2014 Subject pH Remove constraint Subject: pH Subject arsenic Remove constraint Subject: arsenic Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
Start Over

Search

196  Search Results

« Previous | 1 - 50 of 196 |
Number of results to display per page

Search Results

1. (Methyl)Mercury, Arsenic, and Lead Contamination of the World’s Largest Wastewater Irrigation System: the Mezquital Valley (Hidalgo State—Mexico)

Author:
Stéphane Guédron; Céline Duwig; Blanca Lucia Prado; David Point; Marizol Giovana Flores; Christina Siebe
Source:
Water, air, and soil pollution 2014 v.225 no.8 pp. 2045
ISSN:
0049-6979
Subject:
adsorption; agricultural soils; arsenic; chromium; drinking water; groundwater; iron; irrigated soils; lead; manganese; mercury; methylmercury compounds; monitoring; oxidation; pH; people; risk; rivers; soil profiles; surface water; wastewater; wastewater irrigation; water supply; Mexico
Abstract:
... In the Mezquital valley, untreated wastewater (45 m³ s⁻¹) from Mexico City is used for the irrigation of around 900 km²of agricultural soil. High concentrations of metals including methylmercury (3.8 ± 2.5 ng l⁻¹) and lead (0.16 ± 0.05 mg l⁻¹) were measured in anoxic wastewater canals. Downstream, dissolved, and particulate polymetallic (Hg, Pb, Cr…) concentrations decreased by factors 10 to 1,000 ...
DOI:
10.1007/s11270-014-2045-3

2. Abiotic and biotic factors influencing the mobility of arsenic in groundwater of a through-flow island in the Okavango Delta, Botswana

Author:
Natalie Mladenov; Piotr Wolski; Ganga M. Hettiarachchi; Michael Murray-Hudson; Hersy Enriquez; Sivaramakrishna Damaraju; Madhubhashini B. Galkaduwa; Diane M. McKnight; Wellington Masamba
Source:
Journal of hydrology 2014 v.518 pp. 326-341
ISSN:
0022-1694
Subject:
X-radiation; absorption; arsenic; biotic factors; constructed wetlands; desorption; detection limit; dissolved organic matter; evapotranspiration; floodplains; groundwater; islands; pH; solutes; spectroscopy; sulfate-reducing bacteria; sulfates; sulfides; surface water; swamps; water management; Botswana
Abstract:
... The Okavango Delta of Botswana is a large arid-zone wetland comprising 20,000km2 of permanent and seasonal floodplains and over 100,000 islands. It has been shown that island groundwater can have very high dissolved arsenic (As) concentration, but the abiotic and biotic controls on As mobility are not well understood in this setting. At New Island, an island located in the seasonal swamp, dissolve ...
DOI:
10.1016/j.jhydrol.2013.09.026

3. Acidification of lake water due to drought

Author:
L.M. Mosley; B. Zammit; A.M. Jolley; L. Barnett
Source:
Journal of hydrology 2014 v.511 pp. 484-493
ISSN:
0022-1694
Subject:
acidification; acidity; alkalinity; aluminum; aquatic ecosystems; arsenic; basins; chromium; climate; cobalt; copper; drought; groundwater; guidelines; iron; lakes; limestone; manganese; neutralization; nickel; pH; pyrite; rain; rivers; sediments; surface water; water management; zinc; Australia
Abstract:
... Droughts are predicted to increase in many river systems due to increased demand on water resources and climate variability. A severe drought in the Murray-Darling Basin of Australia from 2007 to 2009 resulted in unprecedented declines in water levels in the Lower Lakes (Ramsar-listed ecosystem of international importance) at the end of the river system. The receding water exposed large areas (>20 ...
DOI:
10.1016/j.jhydrol.2014.02.001

4. Adsorption and photocatalytic decomposition of roxarsone by TiO2 and its mechanism

Author:
Donglei Lu; Feng Ji; Wei Wang; Shoujun Yuan; Zhen-Hu Hu; Tianhu Chen
Source:
Environmental science and pollution research international 2014 v.21 no.13 pp. 8025-8035
ISSN:
0944-1344
Subject:
adsorption; arsenic; fluorescence; gas chromatography; livestock and meat industry; mass spectrometry; pH; roxarsone
Abstract:
... Roxarsone (3-nitro-4-hydroxyphenylarsonic acid) has been widely used as organic arsenic additive in animal industry. In this study, the adsorption of roxarsone on TiO₂under dark conditions, the photocatalytic decomposition of roxarsone under UV/TiO₂, and the possible photocatalytic pathway were investigated. At the initial concentration of 5–35 mg/L, the adsorption of roxarsone fitted well with th ...
DOI:
10.1007/s11356-014-2729-7
PubMed:
24659434

5. Adsorption and removal of arsenic (V) using crystalline manganese (II,III) oxide: Kinetics, equilibrium, effect of pH and ionic strength

Author:
Kamel Babaeivelni; Amid P. Khodadoust; Dorin Bogdan
Source:
Journal of environmental science and health 2014 v.49 no.13 pp. 1462-1473
ISSN:
1532-4117
Subject:
adsorption; alkalinity; aluminum oxide; arsenic; bicarbonates; environmental health; equations; groundwater; ionic strength; ions; manganese; pH; sorption isotherms; surface area
Abstract:
... Manganese (II,III) oxide (Mn ₃O ₄) crystalline powder was evaluated as a potential sorbent for removal of arsenic (V) from water. Adsorption isotherm experiments were carried out to determine the adsorption capacity using de-ionized (DI) water, a synthetic solution containing bicarbonate alkalinity, and two natual groundwater samples. Adsorption isotherm data followed the Langmuir and Freundlich e ...
DOI:
10.1080/10934529.2014.937160

6. Adsorption characteristics of arsenic from micro-polluted water by an innovative coal-based mesoporous activated carbon

Author:
Wei-Guang Li; Xu-Jin Gong; Ke Wang; Xin-Ran Zhang; Wen-Biao Fan
Source:
Bioresource technology 2014 v.165 pp. 166-173
ISSN:
0960-8524
Subject:
activated carbon; adsorbents; adsorption; arsenic; iodine; ions; methodology; methylene blue; oxidation; pH; porous media; sorption isotherms
Abstract:
... An innovative coal-based mesoporous activated carbon (NCPAC) was prepared by re-agglomeration, oxidation and two-step activation using coal-blending as precursor. Adsorption capacities of As(III) and As(V) ions (<0.5mg/L) onto NCPAC as a function of pH, adsorbent dose, initial arsenic concentrations, contact time, and adsorption isotherms at 7°C was investigated. The innovative methods promoted to ...
DOI:
10.1016/j.biortech.2014.02.069

7. Adsorption of arsenic by activated carbon, calcium alginate and their composite beads

Author:
A.F. Hassan; A.M. Abdel-Mohsen; H. Elhadidy
Source:
International journal of biological macromolecules 2014 v.68 pp. 125-130
ISSN:
0141-8130
Subject:
Fourier transform infrared spectroscopy; activated carbon; adsorbents; adsorption; apricots; arsenic; calcium alginate; ions; pH; porosity; potassium hydroxide; scanning electron microscopes; scanning electron microscopy; surface area; temperature; thermodynamics
Abstract:
... The present investigation deals with preparation of three different adsorbent materials namely; potassium hydroxide activated carbon based apricot stone (C), calcium alginate beads (G) and calcium alginate/activated carbon composite beads (GC) were used for the removal of arsenic. The prepared adsorbent materials were characterized by scanning electron microscope (SEM), Fourier transform infrared ...
DOI:
10.1016/j.ijbiomac.2014.04.006

8. Application of a plant bioassay for the evaluation of ecotoxicological risks of heavy metals in sediments affected by mining activities

Author:
Mari Luz García-Lorenzo; María José Martínez-Sánchez; Carmen Pérez-Sirvent
Source:
Journal of soils and sediments 2014 v.14 no.10 pp. 1753-1765
ISSN:
1439-0108
Subject:
arsenic; bioassays; cadmium; copper; ecotoxicology; heavy metals; iron; lead; limestone; mining; mixing; pH; remediation; risk; screening; sediments; surveys; toxicity; zinc; Spain
Abstract:
... PURPOSE: The objective of this work was to evaluate the effectiveness of a plant bioassay (Phytotoxkit®) for screening ecotoxicological risks in sediments affected by mining activities. MATERIALS AND METHODS: A total of 42 sediment samples affected by mining activities were studied, including 39 sediment samples from the Sierra Minera, Spain, an area affected by old extraction procedures, and thre ...
DOI:
10.1007/s11368-014-0942-0

9. Application of magnesite–bentonite clay composite as an alternative technology for removal of arsenic from industrial effluents

Author:
Vhahangwele Masindi; Mugera W. Gitari; Hlanganani Tutu; Marinda De Beer
Source:
Toxicological and environmental chemistry 2014 v.96 no.10 pp. 1435-1451
ISSN:
1029-0486
Subject:
World Health Organization; adsorbents; adsorption; agitation; arsenic; bentonite; clay; guidelines; industrial effluents; magnesite; models; pH; water pollution; water quality
Abstract:
... This study evaluated the feasibility of integrating amorphous magnesite and bentonite clay (composite) as an alternative technology for removing arsenic from industrial effluents. The removal of arsenic from industrial effluents by using magnesite–bentonite clay composite was carried out in batch mode. The effects of equilibration time, adsorbent dosage, adsorbate concentration, and pH on removal ...
DOI:
10.1080/02772248.2014.966714

10. Application of multi-factorial experimental design to successfully model and optimize inorganic arsenic speciation in environmental water samples by ultrasound assisted emulsification of solidified floating organic drop microextraction

Author:
Mehdi Asadollahzadeh; Nazly Niksirat; Hamed Tavakoli; Alireza Hemmati; Parvaneh Rahdari; Mehrnoush Mohammadi; Reza Fazaeli
Source:
Analytical methods 2014 v.6 no.9 pp. 2973-2981
ISSN:
1759-9679
Subject:
ambient temperature; ammonium; arsenic; atomic absorption spectrometry; centrifugation; chelating agents; droplets; emulsifying; experimental design; ice; mathematical models; melting; microextraction; pH; potassium iodide; reference standards; screening; sodium thiosulfate; solvents; sonication; ultrasonic treatment; ultrasonics
Abstract:
... Ultrasound assisted emulsification of solidified floating organic drop microextraction (USAE-SFODME), combined with electrothermal atomic absorption spectrometry (ETAAS), was developed for the preconcentration and determination of trace amounts of As(iii) and As(v) in environmental water samples. At pH = 1, As(iii) formed complexes with ammonium pyrrolidine dithiocarbamate (APDC) and these were ex ...
DOI:
10.1039/c3ay41712c

11. Arsenate removal from aqueous solutions using magnetic mesoporous iron manganese bimetal oxides

Author:
Zhipan Wen; Chaomeng Dai; Yan Zhu; Yalei Zhang
Source:
RSC advances 2014 v.5 no.6 pp. 4058-4068
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorbents; adsorption; aqueous solutions; arsenates; arsenic; energy-dispersive X-ray analysis; iron; isoelectric point; magnetic fields; manganese; models; oxides; pH; porous media; scanning electron microscopy; sorption isotherms; surface area; transmission electron microscopy
Abstract:
... Magnetic mesoporous iron manganese bimetal oxide (MMIM) with high specific surface area, pore volume and well interconnected mesopores was synthesized via the nanocasting strategy using KIT-6 as a hard template. The morphology and physicochemical properties of the samples were characterized using SEM-EDS, TEM, XRD, VSM, FT-IR and XPS, etc. The obtained MMIM was used as an adsorbent to remove arsen ...
DOI:
10.1039/c4ra09746g

12. Arsenate–Ferrihydrite Systems from Minutes to Months: A Macroscopic and IR Spectroscopic Study of an Elusive Equilibrium

Author:
Swedlund Peter J.; Holtkamp Hannah; Song Yantao; Daughney Christopher J.
Source:
Environmental Science & Technology 2014 v.48 no.5 pp. 2759-2765
ISSN:
1520-5851
Subject:
arsenic; equations; ferrihydrite; models; pH; sorption; spectral analysis
Abstract:
... Sorption by ferrihydrite is an important control on As(V) concentrations in many oxic aquatic systems. There are significant discrepancies in reported sorption constants (log(KAₛ)), which presents a problem for quantifying and understanding this important system. A review of reported ferrihydrite–As(V) sorption studies indicated a positive correlation between reaction time used in the experiments ...
DOI:
10.1021/es404742c

13. Arsenic Removal from Water by Sugarcane Bagasse: An Application of Response Surface Methodology (RSM)

Author:
Hamid Tajernia; Taghi Ebadi; Bahram Nasernejad; Maryam Ghafori
Source:
Water, air, and soil pollution 2014 v.225 no.7 pp. 2028
ISSN:
0049-6979
Subject:
sugar industry; activated carbon; heavy metals; arsenic; biosorbents; response surface methodology; sugarcane bagasse; pH; cost effectiveness; biosorption; adsorption
Abstract:
... Adsorption is one of the best methods for arsenic removal from water which is established in the last few decades. Biosorption by natural biosorbents and agricultural by-product is an environmental friendly approach and has proved to be a cost-effective and non-hazardous technology for the removal of heavy metals from water. This paper describes batch test findings conducted to evaluate the feasib ...
DOI:
10.1007/s11270-014-2028-4

14. Arsenic Speciation in Newberyite (MgHPO4·3H2O) Determined by Synchrotron X-ray Absorption and Electron Paramagnetic Resonance Spectroscopies: Implications for the Fate of Arsenic in Green Fertilizers

Author:
Lin Jinru; Chen Ning; Pan Yuanming
Source:
Environmental Science & Technology 2014 v.48 no.12 pp. 6938-6946
ISSN:
1520-5851
Subject:
X-radiation; absorption; acid soils; animal manures; arsenates; arsenic; crystallization; electron paramagnetic resonance spectroscopy; fertilizers; food chain; magnesium ammonium phosphate; pH; quantitative analysis; remediation; spectral analysis; wastewater
Abstract:
... Newberyite (MgHPO₄·3H₂O), a biomineral and common constituent in guano deposits, is an important decomposition product of struvite that is an increasingly popular green fertilizer recovered from wastewaters. Two samples of newberyite containing 1099 and 25 ppm As have been obtained at pH = 6.4, by using Na₂HAsO₄·7H₂O and NaAsO₂ as the dopant, respectively (i.e., Synthesis 1 and Synthesis 2). Synch ...
DOI:
10.1021/es405735p

15. Arsenic Species Formed from Arsenopyrite Weathering along a Contamination Gradient in Circumneutral River Floodplain Soils

Author:
Mandaliev Petar N.; Mikutta Christian; Barmettler Kurt; Kotsev Tsvetan; Kretzschmar Ruben
Source:
Environmental Science & Technology 2014 v.48 no.1 pp. 208-217
ISSN:
1520-5851
Subject:
X-radiation; X-ray absorption spectroscopy; X-ray diffraction; alluvial soils; anaerobic conditions; arsenic; bioavailability; breathing; ferric oxide; ferrihydrite; floodplains; fluorescence; geometry; humans; ingestion; iron; mining; pH; particle size; rivers; soil sampling; toxicity; wastes; weathering; wetlands; Bulgaria
Abstract:
... Arsenic is a toxic trace element, which commonly occurs as contaminant in riverine floodplains and associated wetlands affected by mining and ore processing. In this study, we investigated the solid-phase speciation of As in river floodplain soils characterized by circumneutral pH (5.7–7.1) and As concentrations of up to 40.3 g/kg caused by former mining of arsenopyrite-rich ores. Soil samples col ...
DOI:
10.1021/es403210y

16. Arsenic Species Uptake and Subcellular Distribution in Vallisneria natans (Lour.) Hara as Influenced by Aquatic pH

Author:
Guoliang Chen; Xingmei Liu; Jianming Xu; Philip C. Brookes; Jianjun Wu
Source:
Bulletin of environmental contamination and toxicology 2014 v.92 no.4 pp. 478-482
ISSN:
0007-4861
Subject:
Vallisneria; arsenic; pH; submerged aquatic plants; water pollution
Abstract:
... Vallisneria natans (Lour.) Hara, a widely distributed submerged aquatic plant, is a promising species for arsenic (As) removal from contaminated water. We investigated the effects of pH on the accumulation, subcellular distribution and detoxification of As in V. natans. The results showed that the optimum pH for submerged V. natans growth is close to 7.0. The accumulation of As in the plant increa ...
DOI:
10.1007/s00128-013-1195-0
PubMed:
24420344

17. Arsenic concentration variability, health risk assessment, and source identification using multivariate analysis in selected villages of public water system, Lahore, Pakistan

Author:
Jawairia Sultana; Abida Farooqi; Usman Ali
Source:
Environmental monitoring and assessment 2014 v.186 no.2 pp. 1241-1251
ISSN:
0167-6369
Subject:
World Health Organization; arsenic; average daily intake; desorption; groundwater contamination; minerals; multivariate analysis; pH; risk; villages; Pakistan
Abstract:
... This paper reports high levels and variability in arsenic (As) levels at locations identified as one of the highest As-contaminated locations in Pakistan. Groundwater pollution related to arsenic has been reported since many years in the areas lying in outskirts of District Lahore, Pakistan. A comparative study is done to determine temporal variations of As from three villages, i.e., Kalalanwala ( ...
DOI:
10.1007/s10661-013-3453-3
PubMed:
24197557

18. Arsenic content in groundwater from the southern part of the San Antonio-El Triunfo mining district, Baja California Sur, Mexico

Author:
Jobst Wurl; Lía Mendez-Rodriguez; Baudilio Acosta-Vargas
Source:
Journal of hydrology 2014 v.518 pp. 447-459
ISSN:
0022-1694
Subject:
World Health Organization; arsenic; autumn; boron; byproducts; cyanides; fluorides; gold; groundwater; minerals; mining; oxidation; pH; silver; Mexico
Abstract:
... The San Antonio-El Triunfo mining district is located in a mountain region 60km southeast of La Paz, the capital of the Mexican state of Baja California Sur. Mining activities, focused on gold and silver extraction, which began in the second half of the 18th century; the main activity took place between 1878 and 1911. The minerals were treated through the cyanide method, burned, and smelted. In ef ...
DOI:
10.1016/j.jhydrol.2014.05.009

19. Arsenic dynamics in the rhizosphere and its sequestration on rice roots as affected by root oxidation

Author:
Weisong Pan; Chuan Wu; Shengguo Xue; William Hartley
Source:
Journal of Environmental Sciences 2014 v.26 pp. 892-899
ISSN:
1001-0742
Subject:
arsenic; arsenites; correlation; genotype; iron; oxidation; oxygen; pH; plant tissues; redox potential; rhizosphere; rice; rice straw; roots; soil
Abstract:
... A pot experiment was conducted to investigate the effects of root oxidation on arsenic (As) dynamics in the rhizosphere and As sequestration on rice roots. There were significant differences (P < 0.05) in pH values between rhizosphere and non-rhizosphere soils, with pH 5.68–6.16 in the rhizosphere and 6.30–6.37 in non-rhizosphere soils as well as differences in redox potentials (P < 0.05). Percent ...
DOI:
10.1016/S1001-0742(13)60483-0

20. Arsenic mobilization in aquifers of the southwest Songnen basin, P.R. China: Evidences from chemical and isotopic characteristics

Author:
Huaming Guo; Di Zhang; Dongguang Wen; Yang Wu; Ping Ni; Yuxiao Jiang; Qi Guo; Fulan Li; Hao Zheng; Yinzhu Zhou
Source:
Science of the total environment 2014 v.490 pp. 590-602
ISSN:
0048-9697
Subject:
manganese; calcite; dissolved organic carbon; groundwater; sediments; sulfates; irrigation; iron; hydrogen sulfide; surface water; basins; redox potential; drinking; arsenic; aquifers; groundwater flow; pyrite; pH; biodegradation; siderite; nitrates; China
Abstract:
... High As groundwater has widely been found in the inland basins of China. Little is known about distribution and mobilization mechanisms of high As groundwater in the Songnen basin, where groundwater is the major source for drinking and irrigation. Eighty-seven groundwater samples, three surface water samples and sixty-three sediment samples were taken from the southwest of the Songnen basin, in or ...
DOI:
10.1016/j.scitotenv.2014.05.050

21. Arsenic removal from aqueous solution using pyrite

Author:
Gülay Bulut; Ünzile Yenial; Emrecan Emiroğlu; Ayhan Ali Sirkeci
Source:
Journal of cleaner production 2014 v.84 pp. 526-532
ISSN:
0959-6526
Subject:
adsorbents; adsorption; aqueous solutions; arsenic; cost effectiveness; flocculation; oxidation; pH; particle size; pollutants; pyrite
Abstract:
... Arsenic is one of the major pollutants and a worldwide concern because of its toxicity and chronic effects on human health. This investigation presents the results of arsenic adsorption onto four adsorbents such as pure pyrite, waste pyrite, dried waste pyrite and ground dried waste pyrite. The findings show that the addition of 5 g/L ground dried waste pyrite into the solution proved a high arsen ...
DOI:
10.1016/j.jclepro.2013.08.018

22. Arsenic removal from groundwater by acclimated sludge under autohydrogenotrophic conditions

Author:
Siqing Xia; Shuang Shen; Xiaoyin Xu; Jun Liang; Lijie Zhou
Source:
Journal of Environmental Sciences 2014 v.26 pp. 248-255
ISSN:
1001-0742
Subject:
adsorption; arsenates; arsenic; arsenites; biochemical pathways; decontamination; groundwater; hydrogen; kinetics; models; pH; sludge; sulfates; sulfides; temperature; toxicity
Abstract:
... Arsenic in the environment is attracting increasing attention due to its chronic health effects. Although arsenite (As(III)) is generally more mobile and more toxic than arsenate (As(V)), reducing As(V) to As(III) may still be a means for decontamination, because As(III) can be removed from solution by precipitation with sulfide or by adsorption or complexation with other metal sulfides. The perfo ...
DOI:
10.1016/S1001-0742(13)60413-1

23. Arsenic removal in a sulfidogenic fixed-bed column bioreactor

Author:
Muslum Altun; Erkan Sahinkaya; Ilknur Durukan; Sema Bektas; Kostas Komnitsas
Source:
Journal of hazardous materials 2014 v.269 pp. 31-37
ISSN:
0304-3894
Subject:
X-radiation; X-ray diffraction; alkalinity; arsenates; arsenic; bioreactors; chemical oxygen demand; coprecipitation; energy-dispersive X-ray analysis; ethanol; fluorescence; iron; pH; pyrite; scanning electron microscopy; sulfate-reducing bacteria; sulfates; wastewater
Abstract:
... In the present study, the bioremoval of arsenic from synthetic acidic wastewater containing arsenate (As5+) (0.5–20mg/L), ferrous iron (Fe2+) (100–200mg/L) and sulfate (2000mg/L) was investigated in an ethanol fed (780–1560mg/L chemical oxygen demand (COD)) anaerobic up-flow fixed bed column bioreactor at constant hydraulic retention time (HRT) of 9.6h. Arsenic removal efficiency was low and avera ...
DOI:
10.1016/j.jhazmat.2013.11.047

24. Arsenic speciation in sinter mineralization from a hydrothermal channel of El Tatio geothermal field, Chile

Author:
Marco A. Alsina; Luciana Zanella; Cathleen Hoel; Gonzalo E. Pizarro; Jean-François Gaillard; Pablo A. Pasten
Source:
Journal of hydrology 2014 v.518 pp. 434-446
ISSN:
0022-1694
Subject:
X-radiation; X-ray absorption spectroscopy; X-ray diffraction; absorption; arsenates; arsenic; biogeochemistry; fluorescence; hot springs; least squares; mineralization; oxides; pH; rivers; surface water; Chile
Abstract:
... El Tatio geothermal field is the principal natural source of arsenic for the Loa River, the main surface water resource in the hyper-arid Atacama Desert (Antofagasta Region, Northern Chile).Prior investigations by bulk X-ray absorption spectroscopy have identified hydrous ferric oxides as the principal arsenic-containing phase in sinter material from El Tatio, suggesting sorption as the main mecha ...
DOI:
10.1016/j.jhydrol.2013.04.012

25. Arsenic-Rich Acid Mine Water with Extreme Arsenic Concentration: Mineralogy, Geochemistry, Microbiology, and Environmental Implications

Author:
Majzlan Juraj; Plášil Jakub; Škoda Radek; Gescher Johannes; Kögler Felix; Rusznyak Anna; Küsel Kirsten; Neu Thomas R.; Mangold Stefan; Rothe Jörg
Source:
Environmental Science & Technology 2014 v.48 no.23 pp. 13685-13693
ISSN:
1520-5851
Subject:
DNA; X-ray absorption spectroscopy; aqueous solutions; arsenic; droplets; geochemistry; iron; microbial biomass; microbial colonization; microorganisms; minerals; pH; polymerase chain reaction; polymerization; weathering; Czech Republic
Abstract:
... Extremely arsenic-rich acid mine waters have developed by weathering of native arsenic in a sulfide-poor environment on the 10th level of the Svornost mine in Jáchymov (Czech Republic). Arsenic rapidly oxidizes to arsenolite (As₂O₃), and there are droplets of liquid on the arsenolite crust with high As concentration (80,000–130,000 mg·L–¹), pH close to 0, and density of 1.65 g·cm–¹. According to ...
DOI:
10.1021/es5024916

26. Arsenite Binding to Sulfhydryl Groups in the Absence and Presence of Ferrihydrite: A Model Study

Author:
Hoffmann Martin; Mikutta Christian; Kretzschmar Ruben
Source:
Environmental Science & Technology 2014 v.48 no.7 pp. 3822-3831
ISSN:
1520-5851
Subject:
X-ray absorption spectroscopy; adsorbents; adsorption; air; arsenic; arsenites; binding sites; estuaries; ferrihydrite; ligands; marshes; models; organic matter; oxidation; pH; peatlands; plants (botany); redox potential; remediation; sulfhydryl groups; water vapor
Abstract:
... Binding of arsenite (As(III)) to sulfhydryl groups (Sₒᵣg(-II)) plays a key role in As detoxification mechanisms of plants and microorganisms, As remediation techniques, and reduced environmental systems rich in natural organic matter. Here, we studied the formation of Sₒᵣg(-II)–As(III) complexes on a sulfhydryl model adsorbent (Ambersep GT74 resin) in the absence and presence of ferrihydrite as a ...
DOI:
10.1021/es405221z

27. Arsenite Oxidation Initiated by the UV Photolysis of Nitrite and Nitrate

Author:
Kim Dong-hyo; Lee Jaesang; Ryu Jungho; Kim Kitae; Choi Wonyong
Source:
Environmental Science & Technology 2014 v.48 no.7 pp. 4030-4037
ISSN:
1520-5851
Subject:
arsenates; arsenic; arsenites; dissociation; electron transfer; hydroxyl radicals; nitrates; nitrites; nitrogen dioxide; nitrous acid; nitrous oxide; oxidants; oxygen; pH; photolysis; photooxidation; photosensitizing agents; solar radiation; superoxide anion; ultraviolet radiation
Abstract:
... This study demonstrates that the production of reactive oxidizing species (e.g., hydroxyl radical (•OH)) during the photolysis of nitrite (NO₂–) or nitrate (NO₃–) leads to the oxidative conversion of arsenite (As(III)) to arsenate (As(V)). While the direct UV photolytic oxidation of As(III) was absent, nitrite (20 or 200 μM) addition markedly accelerated the oxidation of As(III) under UV irradiati ...
DOI:
10.1021/es500001q

28. Arsenite oxidation and removal driven by a bio-electro-Fenton process under neutral pH conditions

Author:
Xiang-Qin Wang; Chuan-Ping Liu; Yong Yuan; Fang-bai Li
Source:
Journal of hazardous materials 2014 v.275 pp. 200-209
ISSN:
0304-3894
Subject:
Fourier transform infrared spectroscopy; aqueous solutions; arsenic; arsenites; cost effectiveness; electricity; electrodes; hydrogen peroxide; iron; microbial fuel cells; oxidation; oxygen; pH
Abstract:
... The iron-catalyzed oxidation of arsenite (As(III)) associated with Fenton or Fenton-like reactions is one of the most efficient arsenic removal methods. However, the conventional chemical or electro-Fenton systems for the oxidation of As(III) are only efficient under acid conditions. In the present study, a cost-effective and efficient bio-electro-Fenton process was performed for As(III) oxidation ...
DOI:
10.1016/j.jhazmat.2014.05.003

29. Assessing the influence of compost and biochar amendments on the mobility and toxicity of metals and arsenic in a naturally contaminated mine soil

Author:
Luke Beesley; Onyeka S. Inneh; Gareth J. Norton; Eduardo Moreno-Jimenez; Tania Pardo; Rafael Clemente; Julian J.C. Dawson
Source:
Environmental pollution 2014 v.186 pp. 195-202
ISSN:
0269-7491
Subject:
Lolium perenne; Vibrio fischeri; arsenic; biochar; composts; dissolved organic carbon; germination; luminescence; metals; mined soils; models; nutrients; organic soils; organic wastes; pH; phosphates; polluted soils; risk; solubilization; toxicity
Abstract:
... Amending contaminated soils with organic wastes can influence trace element mobility and toxicity. Soluble concentrations of metals and arsenic were measured in pore water and aqueous soil extracts following the amendment of a heavily contaminated mine soil with compost and biochar (10% v:v) in a pot experiment. Speciation modelling and toxicity assays (Vibrio fischeri luminescence inhibition and ...
DOI:
10.1016/j.envpol.2013.11.026

30. Assessing the solubility controls on vanadium in groundwater, northeastern San Joaquin Valley, CA

Author:
Michael T. Wright; Kenneth G. Stollenwerk; Kenneth Belitz
Source:
Applied geochemistry 2014 v.48 pp. 41-52
ISSN:
0883-2927
Subject:
adsorption; aluminum; anaerobic conditions; aquifers; arsenic; coatings; desorption; drinking water; geochemistry; groundwater; iron; iron oxides; ligands; manganese oxides; models; nitric acid; oxalates; pH; solubility; sorption isotherms; vanadium
Abstract:
... The solubility controls on vanadium (V) in groundwater were studied due to concerns over possible harmful health effects of ingesting V in drinking water. Vanadium concentrations in the northeastern San Joaquin Valley ranged from <3μg/L to 70μg/L with a median of 21μg/L. Concentrations of V were highest in samples collected from oxic groundwater (49%>25μg/L) and lowest in samples collected from an ...
DOI:
10.1016/j.apgeochem.2014.06.025

31. Attenuation of arsenic in a karst subterranean stream and correlation with geochemical factors: A case study at Lihu, South China

Author:
Liankai Zhang; Hui Yang; Jiansheng Tang; Xiaoqun Qin; Au Yik Yu
Source:
Journal of Environmental Sciences 2014 v.26 pp. 2222-2230
ISSN:
1001-0742
Subject:
X-radiation; alkalinity; aluminum; arsenic; calcium; calcium bicarbonate; case studies; fluorescence; groundwater; humans; iron; karsts; magnesium; manganese; organic matter; pH; pollutants; reaction mechanisms; redox potential; sediments; spectrometers; statistical analysis; streams; China
Abstract:
... Arsenic (As) pollutants generated by human activities in karst areas flow into subterranean streams and contaminate groundwater easily because of the unique hydrogeological characteristics of karst areas. To elucidate the reaction mechanisms of arsenic in karst subterranean streams, physical–chemical analysis was conducted by an inductively coupled plasma mass spectrometer and an X-ray fluorescenc ...
DOI:
10.1016/j.jes.2014.09.005

32. Behavior and mechanism of arsenate adsorption on activated natural siderite: evidences from FTIR and XANES analysis

Author:
Kai Zhao; Huaming Guo
Source:
Environmental science and pollution research 2014 v.21 no.3 pp. 1944-1953
ISSN:
1614-7499
Subject:
Fourier transform infrared spectroscopy; adsorption; anions; arsenic; groundwater; iron; oxidation; pH; temperature
Abstract:
... Activated natural siderite (ANS) was used to investigate its characteristics and mechanisms of As(V) adsorption from aqueous solution. Batch tests were carried out to determine effects of contact time, initial As(V) concentration, temperature, pH, background electrolyte, and coexisting anions on As(V) adsorption. Arsenic(V) adsorption on ANS well-fitted pseudo-second-order kinetics. ANS showed a h ...
DOI:
10.1007/s11356-013-2097-8
PubMed:
24014199

33. Bioaccessibility of Arsenic in Mining-Impacted Circumneutral River Floodplain Soils

Author:
Mikutta Christian; Mandaliev Petar N.; Mahler Nina; Kotsev Tsvetan; Kretzschmar Ruben
Source:
Environmental Science & Technology 2014 v.48 no.22 pp. 13468-13477
ISSN:
1520-5851
Subject:
X-ray absorption spectroscopy; adults; adverse effects; alluvial soils; aluminum; arsenic; bioavailability; ferric oxide; ferrihydrite; floodplains; gastrointestinal system; geophagia; iron; mining; pH; particle size; regression analysis; riparian areas; risk; risk assessment; rivers
Abstract:
... Floodplain soils are frequently contaminated with metal(loid)s due to present or historic mining, but data on the bioaccessibility (BA) of contaminants in these periodically flooded soils are scarce. Therefore, we studied the speciation of As and Fe in eight As-contaminated circumneutral floodplain soils (≤21600 mg As/kg) and their size fractions using X-ray absorption spectroscopy (XAS) and exami ...
DOI:
10.1021/es502635t

34. Biomimetic snowflake-shaped magnetic micro-/nanostructures for highly efficient adsorption of heavy metal ions and organic pollutants from aqueous solution

Author:
Xiaoman Zhang; Jinyun Liu; Sean Joseph Kelly; Xingjiu Huang; Jinhuai Liu
Source:
Journal of materials chemistry A 2014 v.2 no.30 pp. 11759-11767
ISSN:
2050-7496
Subject:
adsorbents; adsorption; aqueous solutions; arsenic; biomimetics; coatings; desorption; heavy metals; iron oxides; lead; magnetism; metal ions; methylene blue; models; nanomaterials; pH; pollutants; recycling; silica; surface area; zinc oxide
Abstract:
... Some conventional micro- or nano-structured adsorbents are subject to the problem that they can hardly show most of their adsorption sites for adsorbing pollutants in solution because of serious aggregation of adsorbents. Here, we present a biomimetic strategy for designing novel adsorbents that promises to address this issue. The ZnO@SiO₂@Fe₃O₄/C micro-/nanostructures prepared have a special snow ...
DOI:
10.1039/c4ta02058h

35. Characterisation of the Sarcheshmeh copper mine tailings, Kerman province, southeast of Iran

Author:
Sajjad Jannesar Malakooti; Seyed Ziaedin Shafaei Tonkaboni; Mohammad Noaparast; Faramarz Doulati Ardejani; Reza Naseh
Source:
Environmental earth sciences 2014 v.71 no.5 pp. 2267-2291
ISSN:
1866-6280
Subject:
acid mine drainage; arsenic; atmospheric precipitation; cadmium; calcite; chromium; cobalt; copper; copper sulfate; leaching; lead; magnesium sulfate; manganese; mine spoil; nickel; oxidation; pH; remediation; strontium; sulfate minerals; sulfide minerals; zinc; zirconium; Iran
Abstract:
... Mineral processing operation at the Sarcheshmeh porphyry copper mine has produced huge quantities of tailings materials containing sulphide minerals in particular pyrite. These tailings materials were geochemically and mineralogically characterised to assess pyrite and chalcopyrite oxidation, acid mine drainage generation, and trace element mobility to lead development of a proper remediation plan ...
DOI:
10.1007/s12665-013-2630-6

36. Characterization and evaluation of arsenic and boron adsorption onto natural geologic materials, and their application in the disposal of excavated altered rock

Author:
Carlito Baltazar Tabelin; Toshifumi Igarashi; Takahiko Arima; Daiki Sato; Takeshi Tatsuhara; Shuichi Tamoto
Source:
Geoderma 2014 v.213 pp. 163-172
ISSN:
0016-7061
Subject:
adsorbents; adsorption; aluminum; aqueous solutions; arsenic; boron; groundwater; iron; marine sediments; minerals; models; pH; rocks; soil; sorption isotherms; Japan
Abstract:
... Construction of tunnels in Hokkaido, Japan often excavates rocks containing substantial amounts of arsenic (As) and boron (B). When these rocks are exposed to the environment, As and B are leached out that could potentially contaminate the surrounding soil and groundwater. Natural geologic materials contain minerals like Al-/Fe-oxyhydroxides/oxides that have As and B adsorption capabilities. Becau ...
DOI:
10.1016/j.geoderma.2013.07.037

37. Characterization of arsenite-oxidizing bacteria isolated from arsenic-contaminated groundwater of West Bengal

Author:
Dhiraj Paul; Soumya Poddar; Pinaki Sar
Source:
Journal of environmental science and health 2014 v.49 no.13 pp. 1481-1492
ISSN:
1532-4117
Subject:
Microbacterium; Pseudomonas; Rhizobium; arsenic; bacteria; biofilm; bioremediation; carbon; chromium; copper; effluents; environmental health; groundwater; heavy metals; hydrocarbons; microbial growth; minimum inhibitory concentration; nickel; oxidation; pH; phylogeny; ribosomal RNA; salinity; siderophores; sulfates; temperature; water pollution; India
Abstract:
... Nine arsenic (As)-resistant bacterial strains isolated from As-rich groundwater samples of West Bengal were characterized to elucidate their potential in geomicrobial transformation and bioremediation aspects. The 16S rRNA gene-based phylogenetic analysis revealed that the strains were affiliated with genera Actinobacteria , Microbacterium , Pseudomonas and Rhizobium . The strains exhibited high r ...
DOI:
10.1080/10934529.2014.937162

38. Characterizing metal(loid) solubility in airborne PM10, PM2.5 and PM1 in Frankfurt, Germany using simulated lung fluids

Author:
Clare L.S. Wiseman; Fathi Zereini
Source:
Atmospheric environment 2014 v.89 pp. 282-289
ISSN:
1352-2310
Subject:
antimony; arsenic; atmospheric chemistry; breathing; chromium; cobalt; copper; filters; human health; lead; manganese; nickel; pH; particulates; risk; solubility; titanium; toxic substances; toxicity; vanadium; Germany
Abstract:
... The purpose of this study is to assess the solubility of traffic-related metal(loid)s associated with airborne PM of human health concern, employing a physiologically-based extraction test with simulated lung fluids (artificial lysosomal fluid (ALF) and Gamble's solution). Airborne PM (PM10, PM2.5 and PM1) samples were collected in Frankfurt am Main, Germany, using a high volume sampler. Following ...
DOI:
10.1016/j.atmosenv.2014.02.055

39. Chemically Modified Sawdust as Renewable Adsorbent for Arsenic Removal from Water

Author:
Setyono Daisy; Valiyaveettil Suresh
Source:
ACS sustainable chemistry 2014 v.2 no.12 pp. 2722-2729
ISSN:
2168-0485
Subject:
adsorbents; adsorption; anions; arsenates; arsenic; arsenites; cost effectiveness; desorption; groundwater; ionic strength; lanthanum; pH; pollutants; sawdust; water purification; zirconium oxide
Abstract:
... Environmentally friendly and cost-effective adsorbent materials for arsenic extraction are needed for removing pollutants from groundwater. Here, lanthanum or zirconium oxide nanoparticle-incorporated sawdust was used for the removal of arsenic anions from water. The chemically modified sawdust was fully characterized and used for extraction of arsenic from water. The influences of ionic strength, ...
DOI:
10.1021/sc500458x

40. Chitosan-Immobilized Pumice for the Removal of As(V) from Waters

Author:
Dilek Turan; Cemre Kocahakimoğlu; Ezel Boyacı; Sait C. Sofuoglu; Ahmet E. Eroğlu
Source:
Water, air, and soil pollution 2014 v.225 no.5 pp. 1931
ISSN:
0049-6979
Subject:
adsorption; arsenic; atomic absorption spectrometry; chitosan; drinking; ions; pH; pumice; scanning electron microscopy; tap water; titration
Abstract:
... A novel sorbent, chitosan-immobilized pumice, has been prepared for the sorption of As(V) from waters prior to its determination by hydride generation atomic absorption spectrometry. The success of the immobilization has been checked with such characterization techniques as scanning electron microscopy, thermal gravimetric analysis, and elemental analysis. Points of zero charge of the sorbents wer ...
DOI:
10.1007/s11270-014-1931-z

41. Closer Look at As(III) and As(V) Adsorption onto Ferrihydrite under Competitive Conditions

Author:
Qi Pengfei; Pichler Thomas
Source:
Langmuir 2014 v.30 no.37 pp. 11110-11116
ISSN:
1520-5827
Subject:
adsorbents; adsorption; arsenates; arsenic; arsenites; ferrihydrite; ligands; pH; prediction
Abstract:
... Batch experiments were conducted in order to investigate the competitive interaction of arsenite (As(III)) and arsenate (As(V)) onto ferrihydrite as a function of initial pH, adsorbent dosage, concentration of coexisting ligands, and order of addition. The pH generally had a great impact on adsorption under both single ion and competitive conditions. However, the amount of As(V) in solution was th ...
DOI:
10.1021/la502740w

42. Comparison of arsenic and heavy metals contamination between existing wetlands and wetlands created by river diversion in the Yellow River estuary, China

Author:
Zhenglei Xie; Guosong Zhao; Zhigao Sun; Jiyuan Liu
Source:
Environmental earth sciences 2014 v.72 no.5 pp. 1667-1681
ISSN:
1866-6280
Subject:
arsenic; cadmium; chromium; copper; estuaries; heavy metals; lead; nickel; pH; principal component analysis; river deltas; rivers; salinity; soil; soil pollution; soil quality; wetlands; zinc; China; Yellow River
Abstract:
... Samples were collected at 71 sites in the Yellow River Delta Natural Reserve in December 2010 to represent soil conditions before and after the Yellow River (YR) diversion. The As, Cd, Cu, Pb, Zn, and Ni concentrations were measured to determine metal contamination levels. Results suggest that Cd concentrations were significantly higher after the YR diversion than before. The As, Cd, Cr, Cu, Ni, P ...
DOI:
10.1007/s12665-014-3071-6

43. Comparison of the trace metal concentration of drinking water supply options in southwest coastal areas of Bangladesh

Author:
Md. Atikul Islam; Md. Rezaul Karim; Takaya Higuchi; Hiroyuki Sakakibara; Masahiko Sekine
Source:
Applied water science 2014 v.4 no.2 pp. 183-191
ISSN:
2190-5487
Subject:
World Health Organization; aquifers; arsenic; cadmium; calcium; chromium; coasts; copper; drinking; drinking water; freshwater; guidelines; households; humans; iron; lead; magnesium; manganese; nickel; pH; public health; rain; sand filters; spectroscopy; surface water; water harvesting; water quality; water supply; zinc; Bangladesh
Abstract:
... In the coastal areas of Bangladesh, scarcity of drinking water is acute as the fresh water aquifers at reasonable depths are not available and surface water is highly saline. Households are mainly dependent on rainwater harvesting, pond sand filter (PSF), and rain-fed pond water for drinking purposes. To ascertain the water quality for human consumption, chemical parameters such as pH, conductivit ...
DOI:
10.1007/s13201-013-0140-z

44. Complexation of Poly(ethyleneimine)-Bound 8-Hydroxyquinoline with Palladium(II)

Author:
Rongnong Zhou; Kurt E. Geckeler
Source:
Zeitschrift für Naturforschung 2014 v.47 no.9 pp. 1300-1306
ISSN:
0932-0776
Subject:
8-hydroxyquinoline; absorbance; absorption; aluminum; ammonium; aqueous solutions; arsenic; barium; cadmium; calcium; cesium; chromium; ethyleneimine; gold; iron; manganese; mercury; nickel; pH; palladium; polymers; spectroscopy; tartaric acid; wavelengths
Abstract:
... The complexing behavior of poly(ethyleneimine) 5-sulfonyl-8-hydroxyquinoline (POX) with palladium(II) ions in aqueous solution was studied by means of spectrophotometry in the visible region. It was shown that poly(ethyleneimine) 5-sulfonyl-8-hydroxyquinoline forms a stable, water-soluble, orange-colored complex which has a maximum absorption at a wavelength of 424 nm. The effect of pH, concentrat ...
DOI:
10.1515/znb-1992-0915

45. Constraints on Precipitation of the Ferrous Arsenite Solid H7Fe4(AsO3)5

Author:
Yoko Masue-Slowey; Aaron J. Slowey; F. Marc Michel; Samuel M. Webb; Scott Fendorf
Source:
Journal of environmental quality 2014 v.43 no.3 pp. 947-954
ISSN:
0047-2425
Subject:
X-ray absorption spectroscopy; arsenic; arsenites; chemical reduction; geometry; iron; iron oxyhydroxides; lepidocrocite; pH; solubility
Abstract:
... Formation of Fe(II)-As(III) solids is suspected to limit dissolved As concentrations in anaerobic environments. Iron(II) precipitates enriched in As(III) have been observed after microbial reduction of As(V)-loaded lepidocrocite (γ-FeOOH) and symplesite (Fe(II)₃(As(V)O₄)₂]·8H₂O) and upon abiotic reaction of Fe(II) with As(III). However, the conditions favorable for Fe(II)-As(III) precipitation and ...
DOI:
10.2134/jeq2013.08.0340

46. Contamination of Floodplain Soils along the Wupper River, Germany, with As, Co, Cu, Ni, Sb, and Zn and the Impact of Pre-definite Redox Variations on the Mobility of These Elements

Author:
Tina Frohne; Jörg Rinklebe; Roland A. Diaz-Bone
Source:
Soil & sediment contamination 2014 v.23 no.7 pp. 779-799
ISSN:
1549-7887
Subject:
alluvial soils; antimony; arsenic; cobalt; copper; coprecipitation; dissolved organic carbon; iron; manganese; nickel; oxidation; oxides; pH; redox potential; rivers; soil solution; sulfides; sulfur; zinc; Germany
Abstract:
... This study demonstrates that floodplain soils of the River Wupper, Germany, are seriously contaminated with metal(loid)s. We used an automated biogeochemical microcosm system allowing controlled variation of redox potential (E H) to assess the impact of pre-definite redox conditions on the dynamics of arsenic (As), cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), antimony (Sb), an ...
DOI:
10.1080/15320383.2014.872597

47. Contamination of water and soil by the Erdenet copper–molybdenum mine in Mongolia

Author:
Batbold Battogtokh; Jae M. Lee; Nam Woo
Source:
Environmental earth sciences 2014 v.71 no.8 pp. 3363-3374
ISSN:
1866-6280
Subject:
arsenic; cadmium; calcium; copper; environmental impact; groundwater; human health; magnesium; minerals; mining; pH; particle size; pollution load; risk; risk assessment; sediment contamination; sediments; soil pollution; statistical analysis; water pollution; Mongolia
Abstract:
... As one of the largest copper–molybdenum (Cu–Mo) mines in the world, the Erdenet Mine in Mongolia has been active since 1978 and is expected to continue operations for at least another 30 years. In this study, the potential impacts of mining activities on the soil and water environments have been evaluated. Water samples showed high concentrations of sulfate, calcium, magnesium, Mo, and arsenic, an ...
DOI:
10.1007/s12665-013-2727-y

48. Detection of Arsenic(III) through Pulsed Laser-Induced Desorption/Ionization of Gold Nanoparticles on Cellulose Membranes

Author:
Weng Cheng-I; Cang Jin-Shun; Chang Jia-Yaw; Hsiung Tung-Ming; Unnikrishnan Binesh; Hung Yu-Lun; Tseng Yu-Ting; Li Yu-Jia; Shen Yu-Wei; Huang Chih-Ching
Source:
Analytical chemistry 2014 v.86 no.6 pp. 3167-3173
ISSN:
1520-6882
Subject:
United States Environmental Protection Agency; anions; aqueous solutions; arsenic; arsenites; cellulose; detection limit; gold; groundwater; lakes; lead; mass spectrometry; metal ions; mineral water; nanogold; pH; tap water
Abstract:
... We have developed an assay based on gold nanoparticle-modified mixed cellulose ester membrane (Au NPs-MCEM) coupled with laser-induced desorption/ionization mass spectrometry (LDI-MS)-for the detection of arsenic(III) ions (arsenite, AsO₂–) in aqueous solution. When the Au NPs reacted with lead ions (Pb²⁺) in alkaline solution (5 mM glycine–NaOH, pH 12), Au–Pb complexes, PbO, and Pb(OH) were forme ...
DOI:
10.1021/ac500053e

49. Determination of arsenate in water by anion selective membrane electrode using polyurethane–silica gel fibrous anion exchanger composite

Author:
Asif Ali Khan; Shakeeba Shaheen
Source:
Journal of hazardous materials 2014 v.264 pp. 84-90
ISSN:
0304-3894
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; anions; arsenates; arsenic; detection limit; gels; pH; polymerization; polyurethanes; porosity; scanning electron microscopy; silica gel; silicon; specific ion electrodes; thermogravimetry; water content
Abstract:
... Polyurethane (PU)–silica (Si gel) based fibrous anion exchanger composites were prepared by solid–gel polymerization of polyurethane in the presence of different amounts of silica gel. The formation of PU–Si gel fibrous anion exchanger composite was characterized by Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA-DTA), scanning electron mic ...
DOI:
10.1016/j.jhazmat.2013.10.061

50. Determination of lewisite constituents in aqueous samples using hollow-fibre liquid-phase microextraction followed by gas chromatography-mass spectrometry

Author:
M. Y. Cheh; H. C. Chua; F. B. Hopkins; J. R. Riches; C. M. Timperley; H. S. Nancy Lee
Source:
Analytical and bioanalytical chemistry 2014 v.406 no.21 pp. 5103-5110
ISSN:
1618-2642
Subject:
arsenic; chlorides; derivatization; detection limit; gas chromatography-mass spectrometry; ionic strength; liquid-phase microextraction; mixing; pH; solvents
Abstract:
... The applicability of hollow-fibre liquid-phase microextraction for extracting 2-chlorovinyldichloroarsine (lewisite 1), bis(2-chlorovinyl)chloroarsine (lewisite 2), tris(2-chlorovinyl)arsine (lewisite 3) and arsenic trichloride from aqueous samples is reported. Parameters affecting the extraction efficiency of these chemicals were optimised. These parameters included the type of derivatising agent ...
DOI:
10.1007/s00216-014-7751-6