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J Chromatogr A

Title:		Construction and validation of automated purge-and-trap-gas chromatography for the determination of volatile organic compounds
Author(s):		Wang JL; Chen WL;
Address:		"Department of Chemistry, National Central University, Chung-Li, Taiwan. cwang@cc.ncu.edu.tw"
Journal Title:		J Chromatogr A
Year:		2001
Volume:		927
Issue:		1-Feb
Page Number:		143 - 154
DOI:		10.1016/s0021-9673(01)01074-3
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"An automated purge-and-trap chromatographic system for the determination of dissolved volatile organic compounds in aqueous samples was built in the laboratory with minimum cost both in the construction and routine operation. This system was built upon a commercial gas chromatograph with full automation capability using self-developed hardware and software. The use of a multi-sorbent bed quantitatively trapped a wide range of volatile organic compounds at ambient temperature, including the extremely volatile ones such as dichlorofluoromethane (CFC-12). Flash heating for rapid desorption and adequate plumbing for minimizing dead volume resulted in excellent chromatographic separation at above-ambient temperatures, which eliminated the need for cryogen for cooling at the head of the column, a second refocusing stage, or entire GC oven for refocusing. This cryogen-free system was tested with standard solutions and environmental samples for determining hydrocarbons with flame ionization detection, and halogenated compounds with electron-capture detection. An innovative method was also developed for validating the system's linearity for extremely volatile compounds. By introducing ambient air, which usually contains constant levels of anthropogenic halocarbons, e.g., CFC-12 and CFC-11 (CCl3F), the need to prepare aqueous standards containing extremely volatile compounds is avoided, hence providing a convenient method for evaluating a purge-and-trap system"
Keywords:		"Automation Chromatography, Gas/*methods Organic Chemicals/*analysis;"
Notes:		"MedlineWang, J L Chen, W L eng Research Support, Non-U.S. Gov't Validation Study Netherlands 2001/09/27 J Chromatogr A. 2001 Aug 24; 927(1-2):143-54. doi: 10.1016/s0021-9673(01)01074-3"