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J Environ Monit

Title:		Comparison of 24 h averaged VOC monitoring results for residential indoor and outdoor air using Carbopack X-filled diffusive samplers and active sampling--a pilot study
Author(s):		McClenny WA; Jacumin HH; Oliver KD; Daughtrey EH; Whitaker DA;
Address:		"National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA"
Journal Title:		J Environ Monit
Year:		2006
Volume:		20051220
Issue:		2
Page Number:		263 - 269
DOI:		10.1039/b507850d
ISSN/ISBN:		1464-0325 (Print) 1464-0325 (Linking)
Abstract:		"Analytical results obtained by thermal desorption GC/MS for 24 h diffusive sampling of 11 volatile organic compounds (VOCs) are compared with results of time-averaged active sampling at a known constant flow rate. Air samples were collected with co-located duplicate diffusive sampling tubes and one passivated canister. A total of eight multiple-component sampling events took place at fixed positions inside and outside three private homes. Subsequently, a known amount of sample air was transferred from the canister to an adsorbent tube for analysis by thermal desorption GC/MS. Results for the 11 most prevalent compounds--Freon 11, 1,3-butadiene, benzene, toluene, tetrachloroethene, ethylbenzene, m,p-xylene, o-xylene, 4-ethyltoluene, 1,3,5-trimethylbenzene, and p-dichlorobenzene--show that the ratio of average study values (diffusive sampling to active sampling) is 0.92 with 0.70 and 1.14 extreme ratios. Absolute percent difference for duplicate samples using diffusive sampling was <10% for the four most prevalent compounds. Agreement between the two sampling approaches indicates that the prediction of approximately constant diffusive sampling rates based on previous laboratory studies is valid under the field conditions"
Keywords:		"Air Pollutants/*analysis Air Pollution, Indoor/*analysis Diffusion Environmental Monitoring/*instrumentation Gas Chromatography-Mass Spectrometry Housing Organic Chemicals/analysis;"
Notes:		"MedlineMcClenny, William A Jacumin, Henry H Jr Oliver, Karen D Daughtrey, E Hunter Jr Whitaker, Donald A eng Comparative Study Research Support, U.S. Gov't, Non-P.H.S. Validation Study England 2006/02/14 J Environ Monit. 2006 Feb; 8(2):263-9. doi: 10.1039/b507850d. Epub 2005 Dec 20"