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Environ Sci Technol

Title:		Intercomparison of volatile organic carbon measurement techniques and data at La Porte during the TexAQS2000 Air Quality Study
Author(s):		Kuster WC; Jobson BT; Karl T; Riemer D; Apel E; Goldan PD; Fehsenfeld FC;
Address:		"Aeronomy Laboratory, National Oceanic and Atmospheric Administration, R/AL7, 325 Broadway, Boulder, Colorado 80305, USA. bkuster@al.noaa.gov"
Journal Title:		Environ Sci Technol
Year:		2004
Volume:		38
Issue:		1
Page Number:		221 - 228
DOI:		10.1021/es034710r
ISSN/ISBN:		0013-936X (Print) 0013-936X (Linking)
Abstract:		"The Texas Air Quality Study 2000 (TexAQS2000) investigated the photochemical production of ozone and the chemistry of related precursors and reaction products in the vicinity of Houston, TX. The colocation of four instruments for the measurement of volatile organic carbon compounds (VOCs) allowed a unique opportunity for the intercomparison of the different in-situ measuring techniques. The instruments included three gas chromatographs, each with a different type of detector, and a Proton-Transfer-Reaction Mass Spectrometer (PTR-MS) with each system designed to measure a different suite of VOCs. Correlation plots and correlation statistics are presented for species measured by more than one of these instruments. The GC instruments were all in agreement to within 10-20% (slope) with coefficients of variation (r2) of > or = 0.85. The PTR-MS agreement with other instruments was more dependent on species with some very good agreements (r2 values of approximately 0.95 for some aromatics), but isoprene, acetaldehyde and propene were substantially less highly correlated (0.55 < r2 < 0.80). At least part of these differences were undoubtedly due to the timing of sample acquisition in an environment in which VOC levels changed very rapidly on both quantitative and temporal scales"
Keywords:		"Air Pollutants/*analysis Carbon/*analysis Environmental Monitoring/instrumentation/*methods/standards Oxidants, Photochemical/*analysis Ozone/*analysis Reproducibility of Results Texas Volatilization;"
Notes:		"MedlineKuster, W C Jobson, B T Karl, T Riemer, D Apel, E Goldan, P D Fehsenfeld, F C eng Evaluation Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2004/01/27 Environ Sci Technol. 2004 Jan 1; 38(1):221-8. doi: 10.1021/es034710r"