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You searched for: Publication Year 2012 Remove constraint Publication Year: 2012 Subject gas chromatography-mass spectrometry Remove constraint Subject: gas chromatography-mass spectrometry Subject air Remove constraint Subject: air Subject derivatization Remove constraint Subject: derivatization Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
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1. In situ solid-phase microextraction and post on-fiber derivatization combined with gas chromatography–mass spectrometry for determination of phenol in occupational air

Author:
Es-haghi, Ali; Baghernejad, Masoud; Bagheri, Habib
Source:
Analytica chimica acta 2012 v.742 pp. 17-21
ISSN:
0003-2670
Subject:
air; coatings; correlation; derivatization; desorption; detection limit; gas chromatography-mass spectrometry; monitoring; phenol; polyethylene glycol; rapid methods; solid phase microextraction; temperature
Abstract:
... A method based on solid-phase microextraction (SPME) followed by on-fiber derivatization and gas chromatography–mass spectrometry detection (GC–MS) for determination of phenol in air was developed. Three different types of SPME fibers, polar and non-polar poly(dimethylsiloxane) (PDMS) and polyethylene glycol (PEG) were synthesized using sol–gel technology and their feasibility to the sampling of p ...
DOI:
10.1016/j.aca.2012.01.002

2. Determination of polycyclic aromatic hydrocarbons and their oxy-, nitro-, and hydroxy-oxidation products

Author:
Cochran, R.E.; Dongari, N.; Jeong, H.; Beránek, J.; Haddadi, S.; Shipp, J.; Kubátová, A.
Source:
Analytica chimica acta 2012 v.740 pp. 93-103
ISSN:
0003-2670
Subject:
air; derivatization; gas chromatography-mass spectrometry; ionization; methane; monitoring; oxidation; particulates; polycyclic aromatic hydrocarbons; smoke; solid phase extraction; temperature
Abstract:
... A sensitive method has been developed for the trace analysis of PAHs and their oxidation products (i.e., nitro-, oxy-, and hydroxy-PAHs) in air particulate matter (PM). Following PM extraction, PAHs, nitro-, oxy-, and hydroxy-PAHs were fractionated using solid phase extraction (SPE) based on their polarities. Gas chromatography–mass spectrometry (GC–MS) conditions were optimized, addressing inject ...
DOI:
10.1016/j.aca.2012.05.050

3. Why do chemical sensors for explosives detection lose their fluorescence under UV–visible exposure?

Author:
Tournebize, Aurélien; Wong-Wah-Chung, Pascal; Thérias, Sandrine; Bussière, Pierre-Olivier; Rivaton, Agnès; Caron, Thomas; Serein-Spirau, Françoise; Lère-Porte, Jean-Pierre; Montméat, Pierre; Gardette, Jean-Luc
Source:
Polymer degradation and stability 2012 v.97 no.8 pp. 1355-1365
ISSN:
0141-3910
Subject:
air; chemical structure; derivatization; explosives; fluorescence; gas chromatography-mass spectrometry; headspace analysis; infrared spectroscopy; irradiation; oxidation; photoaging; photolysis; polymers; solid phase microextraction
Abstract:
... This paper is devoted to the study of the photodegradation of pi-conjugated fluorescent materials used as chemical sensors for explosives detection. The selected pi-conjugated fluorescent material was a phenylene–ethynylene diimine with di-ether substituents (PH-DE-DI). A rapid disappearance of the fluorescence emission occurred when the material was exposed to solar light in ambient air. To under ...
DOI:
10.1016/j.polymdegradstab.2012.05.026

4. A microfluidic lab-on-chip derivatisation technique for the measurement of gas phase formaldehyde

Author:
Pang, Xiaobing; Lewis, Alastair C.
Source:
Analytical methods 2012 v.4 no.7 pp. 2013-2020
ISSN:
1759-9679
Subject:
acetaldehyde; acetone; air; automation; calibration; derivatization; detection limit; formaldehyde; gas chromatography-mass spectrometry; heat transfer; hydrazones; mixing; mixing ratio; recycling; temperature
Abstract:
... A microfluidic lab-on-chip derivatisation technique has been optimized to achieve a rapid, automated and sensitive determination of ambient gaseous formaldehyde when used in combination with GC-MS. The method used a Pyrex micro-reactor comprising three inlets and one outlet, gas and fluid splitting and combining channels, mixing junctions, and a 2.0 m long, 620 μm internal diameter reaction micro- ...
DOI:
10.1039/c2ay25028d

5. Gas chromatography–full scan mass spectrometry determination of traces of chemical warfare agents and their impurities in air samples by inlet based thermal desorption of sorbent tubes

Author:
Terzic, Oliver; Swahn, Irvine; Cretu, Gheorghita; Palit, Meehir; Mallard, Gary
Source:
Journal of chromatography 2012 v.1225 pp. 182-192
ISSN:
0021-9673
Subject:
air; cooling; derivatization; desorption; detection limit; gas chromatography-mass spectrometry; vapors
Abstract:
... A sensitive gas chromatography–mass spectrometry (GC–MS) based analytical method was developed for detection of the chemical warfare agents (CWA) and related compounds in air/vapor samples. The method uses a Tenax TA packed GC liner as an air/vapor sampling tube and Programmable Temperature-Vaporization (PTV) GC inlet as the thermal desorber. This approach eliminates secondary focusing step and al ...
DOI:
10.1016/j.chroma.2012.01.003