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J Chromatogr A

Title:		Sampling and determination of volatile organic compounds with needle trap devices
Author(s):		Wang A; Fang F; Pawliszyn J;
Address:		"Department of Chemistry, University of Waterloo, Waterloo, Ont., Canada N2L 3G1"
Journal Title:		J Chromatogr A
Year:		2005
Volume:		1072
Issue:		1
Page Number:		127 - 135
DOI:		10.1016/j.chroma.2004.12.064
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"In this study, a sorbent was immobilized inside a needle resulting in the development of a needle trap (NT) device. This device was applied to extract organic components from gaseous samples and to introduce an enriched mixture into a conventional gas chromatography (GC) injector. Construction of this simple and integrated sampling/extraction/sample introduction device was optimized by considering different ways to immobilize a sorbent in the needle, packing single and multiple-layer sorbent beds, and applying different desorption strategies into the GC injector. A carrier gas system was modified to minimize the carryover for the needle trap with a sealed tip (NT-1), and a narrow-neckliner was used for the blunt-tip needle trap (NT-2). Breakthrough in the device was investigated by connecting two NT-2 devices in series. The needle trap performed very well as an exhaustive spot sampler, as well as in a time-weighted average (TWA) operation. The linear velocity of the mobile phase has no influence on the sampling rate of the needle trap. Validation results against the standard NIOSH 1501 method using charcoal tubes for indoor air surveys demonstrated good accuracy for the NT approach. The reproducibility of the NT-2 was about 1% for benzene. The detection limits for FID detection and for 25 ml gas sample were 0.23 ng/l, 2.10 ng/l and 1.12 ng/l for benzene, ethylbenzene and o-xylene, respectively"
Keywords:		"Alkanes/*analysis Benzene Derivatives/*analysis Chemical Fractionation/methods Chromatography, Gas/*instrumentation *Needles Volatilization;"
Notes:		"MedlineWang, Aiping Fang, Fang Pawliszyn, Janusz eng Research Support, Non-U.S. Gov't Validation Study Netherlands 2005/05/11 J Chromatogr A. 2005 Apr 22; 1072(1):127-35. doi: 10.1016/j.chroma.2004.12.064"