Risk Assessment of Organochlorine Pesticides in the Pubugou Hydropower Station Basin of Dadu River
Seventeen surface water sampling sites were set up in the Pubugou Hydropower Station Basin of Dadu River,Sichuan Province.After soxhlet extraction,the samples were extracted by solid phase extraction and nitrogen blowing treat-ment.The content of porganochlorine pesticides(OCPs)in the surface water was determined by gas chromatography-mass spectrometer,and the distribution characteristics and environmental risk assessment were studied,for the purpose to provide scientific advice for the management and environmental protection of hydropower stations.The results showed that the detec-tion rates of γ-HCH,δ-HCH,endosulfan sulfat,endrin,endrin aldehyde,endrin ketone,heptachlor epoxide,aldrin,dieldrin and endosulfan were 5.88％,11.77％,5.88％,41.18％,35.29％,70.59％,11.77％,17.65％,17.65％,41.18％.The other indexes were not detected.Compared with previous studies,endosulfan and δ-HCH were at a high level,γ-HCH,isodieldrin and heptachloride epoxide were at a medium level,and α-HCH,β-HCH,isodieldrin aldehyde and isodieldrin ketone were at a low level.The heptachlor epoxide of Wujiawan point exceeded the category Ⅲ of Environmental Quality Standard for Surface Water(GB 3838-2002),and the pollution was serious.OCPs components were detected and the carcinogenic risk was unacceptable.It is recommended to strictly prohibit the use of this pesticide in the farmland surrounding the sites.
万方数据
维普
