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Anal Chem

Title:		Development of a cryogen-free concentration system for measurements of volatile organic compounds
Author(s):		Sive BC; Zhou Y; Troop D; Wang Y; Little WC; Wingenter OW; Russo RS; Varner RK; Talbot R;
Address:		"Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire 03824, USA. bcs@ccrc.sr.unh.edu"
Journal Title:		Anal Chem
Year:		2005
Volume:		77
Issue:		21
Page Number:		6989 - 6998
DOI:		10.1021/ac0506231
ISSN/ISBN:		0003-2700 (Print) 0003-2700 (Linking)
Abstract:		"An innovative cryogen-free concentrator system for measurement of atmospheric trace gases at the parts per trillion level has been developed with detection by routinely used gas chromatographic methods. The first-generation system was capable of reaching a trapping temperature of -186 degrees C, while the current version can reach -195 degrees C. A Kleemenko cooler is used to create liquid nitrogen equivalent trapping conditions and eliminate the use of solid absorbents, a potential source of artifacts. The method utilizes dual-stage trapping with individual cold regions. The two stages are cooled to -20 and -175 degrees C for water management and sample enrichment, respectively. Both stages house a Silonite-coated stainless steel sample loop; the second stage loop is filled with 1-mm-diameter glass beads, which provide an inert surface area for analyte concentration. In our application, the complete system employed four channels utilizing two flame ionization detectors, one electron capture detector, and a mass spectrometer. The system was automated for unattended operation and was deployed off the New England east coast on Appledore Island to measure a suite of ambient non-methane hydrocarbons, halocarbons, alkyl nitrates, and oxygenated volatile organic compounds during the International Consortium for Atmospheric Research on Transport and Transformation field campaign in summer 2004. This robust system quantified 98 ambient volatile organic compounds with precisions ranging from 0.3 to 15%"
Keywords:
Notes:		"PubMed-not-MEDLINESive, Barkley C Zhou, Yong Troop, Donald Wang, Yuanli Little, William C Wingenter, Oliver W Russo, Rachel S Varner, Ruth K Talbot, Robert eng 2005/11/01 Anal Chem. 2005 Nov 1; 77(21):6989-98. doi: 10.1021/ac0506231"