Continuous Determination of High-Vapor-Phase Concentrations of Tetrachloroethylene Using On-Line Mass Spectrometry
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- 作者：Dennis Fine ; Michael C. Brooks ; Mustafa Bob ; Susan Mravik ; Lynn Wood
- 刊名：Analytical Chemistry
- 出版年：2008
- 出版时间：February 15, 2008
- 年：2008
- 卷：80
- 期：4
- 页码：1328 - 1335
- 全文大小：349K
- 年卷期：v.80,no.4(February 15, 2008)
- ISSN：1520-6882
文摘
A method was developed to determine the vapor concentration of tetrachloroethylene (PCE) at and below itsequilibrium vapor-phase concentration, 168 000 
f">g/L(25 
f">C). Vapor samples were drawn by vacuum into a six-port sampling valve and injected through a jet separatorinto an ion trap mass spectrometer (MS). This on-line MScan continuously sample a vapor stream and providevapor concentrations every 30 s. Calibration of the instrument was done by creating a saturated stream of PCEvapor, sampling the vapor with the on-line MS and withthermal desorption tubes, and correlating the peak arearesponse from the MS with the vapor concentrationdetermined by automated thermal desorption gas chromatography mass spectrometry. Dilution of thesaturated stream provided lower concentrations of PCEvapor. The method was developed to monitor the vaporconcentration of PCE that was sparged from a two-dimensional flow chamber and for determination of thetotal PCE mass removed during each sparge event. Themethod has potential application for analysis of gas-phasetracers.
f">g/L(25 f">C). Vapor samples were drawn by vacuum into a six-port sampling valve and injected through a jet separatorinto an ion trap mass spectrometer (MS). This on-line MScan continuously sample a vapor stream and providevapor concentrations every 30 s. Calibration of the instrument was done by creating a saturated stream of PCEvapor, sampling the vapor with the on-line MS and withthermal desorption tubes, and correlating the peak arearesponse from the MS with the vapor concentrationdetermined by automated thermal desorption gas chromatography mass spectrometry. Dilution of thesaturated stream provided lower concentrations of PCEvapor. The method was developed to monitor the vaporconcentration of PCE that was sparged from a two-dimensional flow chamber and for determination of thetotal PCE mass removed during each sparge event. Themethod has potential application for analysis of gas-phasetracers.