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J Sep Sci

Title:		Performance characteristics of a new prototype for a portable GC using ambient air as carrier gas for on-site analysis
Author(s):		Sanchez JM; Sacks RD;
Address:		"Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA. juanma.sanchez@udg.es"
Journal Title:		J Sep Sci
Year:		2007
Volume:		30
Issue:		7
Page Number:		1052 - 1060
DOI:		10.1002/jssc.200600367
ISSN/ISBN:		1615-9306 (Print) 1615-9306 (Linking)
Abstract:		"The performance characteristics of a portable GC instrument requiring no compressed gas supplies and using relatively lightweight transportable components for the analysis of volatile organic components in large-volume air samples are described. To avoid the need for compressed gas tanks, ambient air is used as the carrier gas, and a vacuum pump is used to pull the carrier gas and injected samples through the wall-coated capillary column and a photoionization detector (PID). At-column heating is used eliminating the need for a conventional oven. The fused silica column is wrapped with heater wire and sensor wire so that heating is provided directly at the column. A PID is used since it requires no external gas supplies and has high sensitivity for many compounds of interest in environmental air monitoring. In order to achieve detection limits in the ppb range, an online multibed preconcentrator containing beds of graphitized carbons and carbon molecular sieves is used. After sample collection, the flow direction through the preconcentrator is reversed, and the sample is thermally desorbed directly into the column. Decomposition of sensitive compounds during desorption is greater with air as the carrier gas than with hydrogen"
Keywords:		"Air *Breath Tests/instrumentation/methods Chromatography, Gas/instrumentation/methods Gases/chemistry Humans Organic Chemicals/*analysis Reference Values Sensitivity and Specificity Silicon Dioxide/chemistry Time Factors;"
Notes:		"MedlineSanchez, Juan M Sacks, Richard D eng Research Support, Non-U.S. Gov't Germany 2007/06/15 J Sep Sci. 2007 May; 30(7):1052-60. doi: 10.1002/jssc.200600367"