Characteristic and sources of organochlorine pesticides from cooking smoke and aerosols.

The compositions and concentrations of organochlorine Pesticides from cooking smoke and aerosols of southern Guangdong and Hong Kong are analyzed with GC/ECD (gas chromatograph/electron capture detector) and capillny chromatograph. The distribution and sources of organochlorine peshcides are also studied. The result shows that 12 kinds of organochlorine pesticides, including 6 kinds of DDT and its metabolites, 3 kinds of BHCs and 3 kinds of chlorine' containing pesticides, with concentrations from 0.20 to 60.78 pglm3, are detected in the cooking smoke and aerosols in the study area. The aerosols collected near farmland or orchard or cooking smoke contain much higher concentraetions of 4,4'-DDT and 2,4'-DDT, which indicates that DDT and its metabolites in atmosphere environment not only come from the process of spreading pesticides or from the polluted surface soil, but also from the release of pyrogenic degradation of animal fat.