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Intercomparison of Volatile Organic Carbon Measurement Techniques and Data at La Porte during the TexAQS2000 Air Quality Study
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T. Karl,§ D. Riemer,‖ E. Apel,§ P. D. Goldan,† and F. C. Fehsenfeld†‡
Section: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 (r 2) of ≥0.85. The PTR-MS agreement with other instruments was more dependent on species with some very good agreements (r2 values of 
0.95 for some aromatics), but isoprene, acetaldehyde and propene were substantially less highly correlated (0.55<r 2<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.
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History
- Published In Issue January 01, 2004
- Received for review July 3, 2003
Revised manuscript received October 9, 2003
Accepted October 16, 2003
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