Study on Residues of Organochloride Pesticides in Soils around Taihu Lake

Surface soil samples from 35 sites around Taihu Lake were collected.The samples were extracted by accelerating solvent extraction(ASE) and analying with GC/MS for the quantification of organochloride pesticides including Hexachlorobenzene(HCB),Chlordane,∑DDTs,Aldrin,Dieldrin,Endrin,Heptachlor and Mirex.HCB and ∑DDTs were detected in 100 percent and 97.1 percent respectively of all soil samples,while the concentration of Aldrin,Dieldrin,Endrin,Heptachlor and Mirex were less than the detection limit.The total amounts of organochloride pesticides were 68.9 μg·kg-1.∑DDTs iss the primary organochloride pesticide in the soil samples,which share in 97.6 percent of the pesticides.The reason that canse residues of ∑DDTs in soils is utilization of which in the past or in recent years.Though HCB is detected widely in the soil samples as one type of POPs,its concentration is low.