HR: 0800h
AN: A51C-0577    [Abstracts]
TI: Chloracetone in California: A Tracer of Cl-atom Chemistry in Urban Air
AU: * Jobson, B T
EM: tjobson@wsu.edu
AF: Washington State University, Department of Civil and Environmental Engineering, Sloan 101, Spokane Street, Pullman, WA 99164, United States
AU: Filipy, J M
EM: jmfilipy@yahoo.com
AF: Washington State University, Department of Civil and Environmental Engineering, Sloan 101, Spokane Street, Pullman, WA 99164, United States
AU: Erickson, M
AF: Washington State University, Department of Civil and Environmental Engineering, Sloan 101, Spokane Street, Pullman, WA 99164, United States
AU: Mendoza, E
AF: Washington State University, Department of Civil and Environmental Engineering, Sloan 101, Spokane Street, Pullman, WA 99164, United States
AU: Allwine, G
EM: allwineg@wsu.edu
AF: Washington State University, Department of Civil and Environmental Engineering, Sloan 101, Spokane Street, Pullman, WA 99164, United States
AB: Chloroacetone is a relatively long lived photoproduct from the Cl-atom initiated oxidation of propene. We report measurements of this compound from Malibu California as part of a collaborative multi-investigator project to study the sources and impact of halogen atom chemistry on ozone in coastal California. As part of this study we performed online measurements of trace organics gases using GC-MS to measure chloroacetone. This species was present in all samples with highest mixing ratios of ~ 15 pptv in air masses that were impacted by the LA urban plume. Additional canister sampling was also performed in Los Angeles. Canisters samples showed the presence of chloroacetone, often at much higher mixing ratios than the coastal samples. This paper will describe the analysis methodology, our results, and potential use of chloracetone as a tracer of Cl-atom oxidation history in polluted air masses.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting