气溶胶和餐厅烟尘中有机氯农药特征与来源

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

使用ＧＣＩＥＣＤ（气相色谱／电子捕获检测器）及毛细色谱柱定量分析粤港地区气溶胶和餐厅烟尘中有机氯农药的组成和分布特征，并分析其主要来源研究表明，从研究区大气环境中的气溶胶样品及餐厅烟尘颗粒物中，检出１２种有机氯农药．其中６种ＤＤＴ（滴滴涕）及其代谢物，３种ＢＨＣ（六六六）和其它３种含氯农药，浓度范围在０．２０～６０、７８ｐｇ／ｍ３．靠近农田和果园的气溶胶及餐厅烟尘颗粒物中４，４'－ＤＤＴ和２，４'－ＤＤＴ浓度较高，说明大气环境中的ＤＤＴ不仅来源于农药施撒过程和农田表层土壤，而且还来源于动物脂肪高温裂解的释放。

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.