Abstract
Ten rain samples were collected at west Los Angeles, California, during two precipitation events. The samples were extracted with CH 2Cl 2 using a separatory funnel followed by continuous steam distillation extraction. Extracts were analyzed for n-alkanes, UCM of hydrocarbons, PAHs, FAs, benzoic acids and phenols using capillary gas chromatography (see Table 1 for definition of acronyms). The concentrations of some compounds decreased with time, whereas those of other compounds increased during the precipitation. Fluctuations of organic concentrations with time are interpreted as being due to washout effect and transient input of organic matter during the precipitation event. The major factor controlling the inputs is suggested to be wind which carries the organic constituents from biogenic and/or anthropogenic (motor vehicle) sources. These results indicate that the origins of air masses scavenged during a rain event may be traced by analysis of the organic constituents in the rain water.
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