北京石景山区夏季大气中有机氯农药的研究

利用气相色谱对北京石景山区大气中气态和总悬浮颗粒物中有机氯农药(OCPs)含量进行了分析测定.结果表明,北京石景山区大气中气态和颗粒物中HCHs、p,p′-DDT、p,p′-DDE、p,p′-DDD、o,p′-DDT、七氯、氯丹的平均含量分别为:4344.4,1000.2,778.0,213.4,1319.3,645.7,376.6pg/m3和37.3,5.3,0,0.7,15.8,1.6,0.6pg/m3,有机氯农药主要以气态存在于大气中.HCHs和DDTs是有机氯农药类污染物的主要成分,两者之和在气态和颗粒物中所占总OCPs的比例分别为87.2%和90.9%.α-HCH/γ-HCH和p,p’-DDE/p,p’-DDT的浓度比值分别1.5和1.0,表明新近该区大气中有γ-HCH和DDT的输入.三氯杀螨醇的使用是环境中DDTs的一个重要来源.

Organochloride pesticides in the atmosphere in the Shijngshan District of Beijing

The atmospheric organochiorine pesticides(OCPs)in the Shijingshan District of Beijing was analyzed by gas chromatography(GC).It was found that the concentration of HCHs,p,p'-DDT,p,p'-DDE,p,p'-DDD,o,p'-DDT,heptachlor,chlordane was 4344.4,1000.2,778.0,213.4,1319.3,645.7 and 376.6 pg/m3 in the gas phase and was 37.3,5.3,0,0.7,15.8,1.6,0.6 pg/m3 in the particle phase,respectively.The OCPs were mostly existed in the gas phase.HCHs and DDTs were the most abundant compounds in the atmosphere which totally accounted for 87.2% in gas phase and 90.9% in the particle phase.The concentrations ratio of α-HCH/γ-HCH and p,p'-DDE/p,p'-DDT were<1.5 and<1.0,respectively,indicating some new input of γ-HCH and DDT in the Beijing area.Most ofthe atmospheric OCPs in Beijing air were from the historical usage.The application of dicofol is a possible new source of DDT in the environment.