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J Environ Monit

Title:		Long-term measurement of volatile organic compounds in ambient air by canister-based one-week sampling method
Author(s):		Ochiai N; Daishima S; Cardin DB;
Address:		"Nishikawa Keisoku Co. Ltd., 2-11-13 Nakacho, Musashino-shi, Tokyo 180-0006, Japan"
Journal Title:		J Environ Monit
Year:		2003
Volume:		5
Issue:		6
Page Number:		997 - 1003
DOI:		10.1039/b307777m
ISSN/ISBN:		1464-0325 (Print) 1464-0325 (Linking)
Abstract:		"A canister-based 1 week sampling method using a mechanical flow controller and a 6 L fused-silica-lined canister was evaluated for the long-term measurement of 47 VOCs in ambient air at pptv (volume/volume) to ppbv levels by use of a three-stage preconcentation method followed by GC-MS analysis. The GC conditions were initially optimized for complete separations of several pptv-level VOCs (e.g. vinyl chloride, 1,3-butadiene, acrylonitrile, 1,2-dichloroethane and chloroform) in ambient air because the selected ions are easily interfered with by coexisting C4-, C5-hydrocarbons and analytes presented at ppbv levels. Thirty-four VOCs determined by the 1 week and 24 h sampling method in December 16-22 (2002) had concentrations of 6.0-15000 pptv per compound. Concentrations of 28 VOCs (including polar VOCs (e.g. methyl isobutyl ketone and butyl acetate)) obtained by the method were approximately equal to the mean values calculated from 24 h sampling (< +/- 10% deviation). Six VOCs that had low concentrations of 6.0-43 pptv showed more than +/- 10% deviation. Thirteen VOCs were not detected during the entire sampling period. The effect of relative humidity or ozone for the specific VOCs (e.g. MIBK, butyl acetate, vinyl chloride, 1,3-butadiene and styrene) was negligible"
Keywords:		"Air Pollutants/*analysis Environmental Monitoring/*instrumentation Gas Chromatography-Mass Spectrometry Humidity Hydrocarbons/*analysis Oxidants, Photochemical/chemistry Ozone/chemistry Seasons Sensitivity and Specificity Volatilization;"
Notes:		"MedlineOchiai, Nobuo Daishima, Shigeki Cardin, Daniel B eng Evaluation Study England 2004/01/09 J Environ Monit. 2003 Dec; 5(6):997-1003. doi: 10.1039/b307777m"