PubAg

Main content area

Search

14  Search Results

1 - 14 of 14
Number of results to display per page

Search Results

1. A carbon nanotube sponge as an adsorbent for vapor preconcentration of aromatic volatile organic compounds

Author:
Bang, Juyeon; You, Dong-Wook; Jang, Yeonhee; Oh, Jun-Sik; Jung, Kwang-Woo
Source:
Journal of chromatography 2019 v.1605 pp. 460363
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; adsorbents; adsorption; air; benzene; carbon nanotubes; desorption; detection limit; gas chromatography; glass; heat; humidity; monitoring; pyrolysis; surface temperature; toluene; vapors; volatile organic compounds; working conditions; xylene;     Show all 21 Subjects
Abstract:
... A carbon nanotube (CNT) sponge was synthesized and examined as an adsorptive material for a thermally desorbed preconcentrator for volatile organic compounds (VOCs). The porous sponge-like material, retaining the intrinsic properties of individual multiwalled (MW) CNTs, was fabricated using spray pyrolysis chemical vapor deposition (CVD). The square pillar form of the CNT sponge was enclosed in a ...
DOI:
10.1016/j.chroma.2019.460363

2. Recovery and reactivity of polycyclic aromatic hydrocarbons collected on selected sorbent tubes and analyzed by thermal desorption-gas chromatography/mass spectrometry

Author:
Wallace, M. Ariel Geer; Pleil, Joachim D.; Whitaker, Donald A.; Oliver, Karen D.
Source:
Journal of chromatography 2019 v.1602 pp. 19-29
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; air; automation; benzene; breath tests; desorption; gas chromatography-mass spectrometry; polycyclic aromatic hydrocarbons; soot; sorbents; stainless steel; toluene; volatile organic compounds; xylene;     Show all 15 Subjects
Abstract:
... This article describes the optimization of methodology for extending the measurement of volatile organic compounds (VOCs) to increasingly heavier polycyclic aromatic hydrocarbons (PAHs) with a detailed focus on recent sorbent tube technology. Although PAHs have lower volatility than compounds such as benzene, toluene, ethylbenzene and xylenes, these semi-volatile compounds can be detected in air a ...
DOI:
10.1016/j.chroma.2019.05.030

3. A single–step synthesized supehydrophobic melamine formaldehyde foam for trace determination of volatile organic pollutants A

Author:
Bagheri, Habib; Zeinali, Shakiba; Baktash, Mohammad Yahya
Source:
Journal of chromatography 2017
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; atmospheric deposition; benzene; desorption; foams; formaldehyde; gas chromatography-mass spectrometry; headspace analysis; hydrophobicity; ionization; melamine; microextraction; non-polar compounds; pollutants; smoke; sorbents; statistical analysis; toluene; volatile organic compounds; wastewater; xylene; Persian Gulf;     Show all 23 Subjects
Abstract:
... Superhydrophobic materials have attracted many attentions in recent years while their application in sample preparation remained almost intact. In this project, a rough surface of melamine formaldehyde foam was silanized by chemical deposition of trichloromethylsilane to form a highly porous and superhydrophobic material, presumably a suitable medium for extracting non–polar compounds such as benz ...
DOI:
10.1016/j.chroma.2017.10.012

4. Development of Carbotrap B-packed needle trap device for determination of volatile organic compounds in air A

Author:
Poormohammadi, Ali; Bahrami, Abdulrahman; Farhadian, Maryam; Ghorbani Shahna, Farshid; Ghiasvand, Alireza
Source:
Journal of chromatography 2017
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene),   etc   ; adsorption; air; benzene; desorption; detection limit; gas chromatography-mass spectrometry; relative humidity; response surface methodology; sorbents; stainless steel; temperature; toluene; volatile organic compounds; xylene;     Show all 15 Subjects
Abstract:
... Carbotrap B as a highly pure surface sorbent with excellent adsorption/desorption properties was packed into a stainless steel needle to develop a new needle trap device (NTD). The performance of the prepared NTD was investigated for sampling, pre-concentration and injection of benzene, toluene, ethyl benzene, o-xylene, and p-xylene (BTEX) into the column of gas chromatography-mass spectrometry (G ...
DOI:
10.1016/j.chroma.2017.10.062

5. Micro-Solid Phase Extraction of Benzene, Toluene, Ethylbenzene and Xylenes from Aqueous Solutions Using Water-Insoluble β-Cyclodextrin Polymer as Sorbent A

Author:
Nojavan, Saeed; Yazdanpanah, Mina
Source:
Journal of chromatography 2017
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; acetonitrile; aqueous solutions; benzene; beta-cyclodextrin; cost effectiveness; crosslinking; desorption; epichlorohydrins; gas chromatography; ionization; polymers; salt concentration; solvents; sorbents; statistical analysis; tea; toluene; ultrasonic treatment; xylene;     Show all 21 Subjects
Abstract:
... Water-insoluble β-cyclodextrin polymer was synthesized by chemical cross-linking using epichlorohydrin (EPI) as a cross-linker agent. The produced water-insoluble polymer was used as a sorbent for the micro-solid phase extraction (μ-SPE) of benzene, toluene, ethylbenzene and xylenes (BTEX) from water samples. The μ-SPE device consisted of a sealed tea bag envelope containing 15mg of sorbent. For t ...
DOI:
10.1016/j.chroma.2017.10.027

6. Highly porous nanostructured copper foam fiber impregnated with an organic solvent for headspace liquid-phase microextraction A

Author:
Saraji, Mohammad; Ghani, Milad; Rezaei, Behzad; Mokhtarianpour, Maryam
Source:
Journal of chromatography 2016 v.1469 pp. 25-34
ISSN:
0021-9673
Subject:
ethylbenzene,   etc   ; benzene; coatings; desorption; detection limit; electrochemistry; foams; gas chromatography; headspace analysis; liquid-phase microextraction; nanomaterials; rivers; salt concentration; solid phase microextraction; solvents; statistical analysis; temperature; toluene; volatile organic compounds; wastewater; xylene;     Show all 21 Subjects
Abstract:
... A new headspace liquid-phase microextraction technique based on using a copper foam nanostructure substrate followed by gas chromatography-flame ionization detection was developed for the determination of volatile organic compounds in water and wastewater samples. The copper foam with highly porous nanostructured walls was fabricated on the surface of a copper wire by a rapid and facile electroche ...
DOI:
10.1016/j.chroma.2016.09.058

7. New nanostructure of polydimethylsiloxane coating as a solid-phase microextraction fiber: Application to analysis of BTEX in aquatic environmental samples B Analytical technologies in the biomedical and life sciences

Author:
Zali, Sara; Jalali, Fahimeh; Es-haghi, Ali; Shamsipur, Mojtaba
Source:
Journal of chromatography 2016 v.1033-1034 pp. 287-295
ISSN:
1570-0232
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; agitation; benzene; coatings; desorption; gas chromatography-mass spectrometry; headspace analysis; ionic strength; nanoparticles; scanning electron microscopy; solid phase microextraction; stainless steel; temperature; thermal stability; toluene; xylene;     Show all 17 Subjects
Abstract:
... Electrospinning technique was used to convert polydimethyl siloxane (PDMS) sol-gel solution to a new nanostructure on a stainless steel wire. The surface morphology of the fiber was observed by scanning electron microscopy (SEM). It showed a diameter range of 30⿿60nm for PDMS nanoparticles with a homogeneous and porous surface structure. The applicability of this coating was assessed for the heads ...
DOI:
10.1016/j.jchromb.2016.08.045

8. Poly(o-anisidine)/graphene oxide nanosheets composite as a coating for the headspace solid-phase microextraction of benzene, toluene, ethylbenzene and xylenes

Author:
Behzadi, Mansoureh; Mirzaei, Mohammad
Source:
Journal of chromatography 2016 v.1443 pp. 35-42
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; Fourier transform infrared spectroscopy; aqueous solutions; benzene; coatings; desorption; detection limit; electrochemistry; gas chromatography; headspace analysis; ionic strength; nanocomposites; nanosheets; river water; scanning electron microscopy; solid phase microextraction; steel; temperature; toluene; xylene;     Show all 21 Subjects
Abstract:
... A poly(o-anisidine)/graphene oxide nanosheets (PoA/GONSs) coating is fabricated by a simple and efficient electrochemical deposition method on steel wire. The incorporation of PoA and GONSs allows preparing a nanocomposite that can successfully integrate the advantages of both. Then, the prepared fiber is applied to the headspace solid-phase microextraction (HS-SPME) and gas chromatographic analys ...
DOI:
10.1016/j.chroma.2016.03.039

9. Roles of inorganic oxide nanoparticles on extraction efficiency of electrospun polyethylene terephthalate nanocomposite as an unbreakable fiber coating A

Author:
Bagheri, Habib; Roostaie, Ali
Source:
Journal of chromatography 2015 v.1375 pp. 8-16
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene); ethylbenzene,   etc   ; benzene; coatings; desorption; detection limit; gas chromatography-mass spectrometry; headspace analysis; ionic strength; iron oxides; models; nanocomposites; nanofibers; nanoparticles; nickel oxide; polyethylene; polyethylene terephthalates; scanning electron microscopy; silica; solid phase microextraction; stainless steel; statistical analysis; tap water; temperature; toluene; volatile organic compounds; xylene;     Show all 27 Subjects
Abstract:
... In the present work, the roles of inorganic oxide nanoparticles on the extraction efficiency of polyethylene terephthalate-based nanocomposites were extensively studied. Four fiber coatings based on polyethylene terephthalate nanocomposites containing different types of nanoparticles along with a pristine polyethylene terephthalate polymer were conveniently electrospun on stainless steel wires. Th ...
DOI:
10.1016/j.chroma.2014.11.059

10. A solid phase microextraction coating based on ionic liquid sol–gel technique for determination of benzene, toluene, ethylbenzene and o-xylene in water samples using gas chromatography flame ionization detector

Author:
Sarafraz-Yazdi, Ali; Vatani, Hossein
Source:
Journal of chromatography 2013 v.1300 pp. 104-111
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene),   etc   ; adsorbents; benzene; chemical bonding; coatings; desorption; detection limit; flame ionization; headspace analysis; ionic liquids; mixing; sol-gel processing; solid phase microextraction; surface area; temperature; toluene; xylene;     Show all 17 Subjects
Abstract:
... Ionic liquid mediated sol–gel sorbents for head-space solid phase microextraction (HS-SPME) were developed for the extraction of benzene, toluene, ethylbenzene and o-xylene (BTEX) compounds from water samples in ultra-trace levels. The analytes were subsequently analyzed with gas chromatography coupled to flame ionization detector (GC-FID). Three different coating fibers were prepared including: p ...
DOI:
10.1016/j.chroma.2013.03.039

11. Development and evaluation of needle trap device geometry and packing methods for automated and manual analysis

Author:
Warren, Jamie M.; Pawliszyn, Janusz
Source:
Journal of chromatography 2011 v.1218 no.50 pp. 8982-8988
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene),   etc   ; air; alkanes; anthracenes; benzene; chromatography; desorption; epoxides; headspace analysis; slurries; solvents; toluene; xylene;     Show all 13 Subjects
Abstract:
... For air/headspace analysis, needle trap devices (NTDs) are applicable for sampling a wide range of volatiles such as benzene, alkanes, and semi-volatile particulate bound compounds such as pyrene. This paper describes a new NTD that is simpler to produce and improves performance relative to previous NTD designs. A NTD utilizing a side-hole needle used a modified tip, which removed the need to use ...
DOI:
10.1016/j.chroma.2011.10.017

12. A novel solid-phase microextraction using coated fiber based sol–gel technique using poly(ethylene glycol) grafted multi-walled carbon nanotubes for determination of benzene, toluene, ethylbenzene and o-xylene in water samples with gas chromatography-flam ionization detector

Author:
Sarafraz-Yazdi, Ali; Amiri, Amirhassan; Rounaghi, Gholamhossein; Hosseini, Hossein Eshtiagh
Source:
Journal of chromatography 2011 v.1218 no.34 pp. 5757-5764
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene),   etc   ; benzene; carbon nanotubes; chemical bonding; coatings; desorption; detection limit; ethylene glycol; gas chromatography; ionization; mixing; silica; solid phase microextraction; surface area; temperature; thermal stability; thermogravimetry; toluene; xylene;     Show all 19 Subjects
Abstract:
... In this study, poly(ethylene glycol) (PEG) grafted onto multi-walled carbon nanotubes (PEG-g-MWCNTs) were synthesized by the covalent functionalization of MWCNTs with hydroxyl-terminated PEG chains. For the first time, functionalized product of PEG-g-MWCNTs was used as selective stationary phase to prepare the sol–gel solid-phase microextraction (SPME) fiber in combination with gas chromatography- ...
DOI:
10.1016/j.chroma.2011.06.099

13. Optimization of a novel method for determination of benzene, toluene, ethylbenzene, and xylenes in hair and waste water samples by carbon nanotubes reinforced sol–gel based hollow fiber solid phase microextraction and gas chromatography using factorial experimental design

Author:
Es’haghi, Zarrin; Ebrahimi, Mahmoud; Hosseini, Mohammad-Saeid
Source:
Journal of chromatography 2011 v.1218 no.21 pp. 3400-3406
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene),   etc   ; adsorption; analysis of variance; benzene; carbon nanotubes; correlation; desorption; experimental design; gas chromatography; humans; mixing; polypropylenes; screening; solid phase microextraction; solvents; toluene; wastewater; xylene;     Show all 18 Subjects
Abstract:
... A novel design of solid phase microextraction fiber containing carbon nanotube reinforced sol–gel which was protected by polypropylene hollow fiber (HF-SPME) was developed for pre-concentration and determination of BTEX in environmental waste water and human hair samples. The method validation was included and satisfying results with high pre-concentration factors were obtained. In the present stu ...
DOI:
10.1016/j.chroma.2011.03.043

14. Analysis of benzene, toluene, ethylbenzene, xylenes and n-aldehydes in melted snow water via solid-phase dynamic extraction combined with gas chromatography/mass spectrometry

Author:
Sieg, Karsten; Fries, Elke; Püttmann, Wilhelm
Source:
Journal of chromatography 2008 v.1178 no.1-2 pp. 178-186
ISSN:
0021-9673
Subject:
BTEX (benzene, toluene, ethylbenzene, xylene),   etc   ; aldehydes; benzene; cooling; desorption; detection limit; extraction; gas chromatography; mass spectrometry; quantitative analysis; snow; snowmelt; toluene; water analysis; water temperature; xylene; Switzerland;     Show all 17 Subjects
Abstract:
... The present study describes a method based on headspace-solid-phase dynamic extraction (HS-SPDE) followed by GC/MS for the qualitative and quantitative analysis of benzene, toluene, ethylbenzene, o-, m- and p-xylene (BTEX), and n-aldehydes (C₆-C₁₀) in water. To enhance the extraction capability of the HS-SPDE a new cooling device was tested that controls the temperature of the SPDE needle during e ...
DOI:
10.1016/j.chroma.2007.11.025