J. Phys. Chem. A 2002, 106, 6469-6476
6469
Reactive Uptake of Ozone by Aerosol-Associated Unsaturated Fatty Acids: Kinetics, Mechanism, and Products Tamar Moise and Yinon Rudich* Department of EnVironmental Sciences, Weizmann Institute, RehoVot 76100, Israel ReceiVed: February 4, 2002; In Final Form: April 10, 2002
The heterogeneous reaction between ozone and oleic and linoleic acids, prevalent components of both marine and urban organic aerosol, were studied in a flow reactor using electron impact and chemical ionization mass spectrometry. Liquids and frozen liquids were used as proxies for atmospheric aerosol. The reactive uptake coefficients, γ, were determined to be (8.3 ( 0.2) × 10-4 and (1.2 ( 0.2) × 10-3 for liquid oleic and linoleic acid respectively and (5.2 ( 0.1) × 10-5 and (1.4 ( 0.1) × 10-4 for frozen oleic and linoleic acid, respectively. Although, the reacto-diffusive length is estimated to be rather small in the liquid experiments,
