title: [Distribution and composition of organochlorine pesticides in farmland top soils of Anhui Province].
abstract: By using ultrasonic method and GC/ECD, this paper analyzed the distribution and composition of 8 kinds of organochlorine pesticides (alpha-HCH, beta-HCH, gamma-HCH, delta-HCH, op'-DDE, pp'-DDD, alpha-endosulfan, and chlorothalonil) in farmland top soils (0-20 cm) in 19 districts of Anhui Province, East China. The total concentration of the pesticides in the top soils ranged from 0 to 23.75 microg x kg(-1), among which, pp'-DDD and gamma-HCH were the major pollutants, with the mean concentration being 13.83 and 13.49 microg x kg(-1), respectively. As compared with the analyses in 1990, the present mean concentration of HCH had an obvious decreasing trend, but was still higher than that in the top soils in other regions of China and in other countries. The mean concentrations of OCPs, HCHs and pp'-DDD in the test top soils were 48.58, 28.64 and 13.83 microg x kg(-1), respectively, not surpassed the first grade level (< 50 microg x kg(-1)) of the China National Soil Environmental Quality Standards (GB 15618-1995), suggesting that the farmland top soils in these districts of Anhui Province were less polluted.
authors.affiliation: Anhui Province Key Laboratory of Agricultural Food Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China. wxq668866@yahoo.com
authors.forename: Xing-Qin
authors.initials: XQ
authors.lastname: Wang
authors.forename: Ri-Mao
authors.initials: RM
authors.lastname: Hua
authors.forename: Jin-Yong
authors.initials: JY
authors.lastname: Pan
authors.forename: Qian
authors.initials: Q
authors.lastname: Gao
authors.forename: Xue-De
authors.initials: XD
authors.lastname: Li
authors.forename: Hai-Qun
authors.initials: HQ
authors.lastname: Cao
authors.forename: Xiang-Wei
authors.initials: XW
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Tang
mesh_terms: D002681:China; D018556:Crops, Agricultural / Q000254:growth & development*; D003634:DDT / Q000032:analysis; D003633:Dichlorodiphenyl Dichloroethylene / Q000032:analysis; D004784:Environmental Monitoring; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D003633:Dichlorodiphenyl Dichloroethylene; D003634:DDT