title: Distribution and sources of organochlorine pesticides in agricultural soils from central China.
abstract: There is little information on the organochlorine pesticides (OCPs) residues in agricultural soils of Wuhan, the largest city in central China. Surface soil samples were collected from agricultural soils in Wuhan and analyzed to determine twenty-one OCPs. According to the measured concentrations and detection frequencies, dichlorodiphenyltrichloroethanes (DDTs), hexachlorocyclohexanes (HCHs), heptachlor (HEPT), hexachlorobenzene (HCB) and aldrin were the predominant compounds in soil. DDTs accounted for 77.10% of total OCPs, followed by HCHs (7.83%), aldrin (4.21%), HEPTs (2.82%) and HCB (1.53%). The total DDT concentrations ranged from nd to 1198.0ngg(-1) and the main contaminated areas were distributed in Hannan and Xinzhou districts of Wuhan. The total HCH concentrations ranged from nd to 100.58ngg(-1) in soil and relatively higher levels were observed in soil samples from Huangpi and Hannan districts. Source analysis showed that OCPs residues except heptachlor originated mainly from historical application, besides slight recent introduction at some sites. Based on the China National Soil Quality Standard, DDT pollution in most samples of Wuhan agricultural soils could be considered as no and low contamination, while the level of HCHs was classified as no pollution. Our study indicated that there existed potential exposure risk of OCPs in Wuhan agricultural soils although the use of OCPs has been banned.
authors.affiliation: Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan 430030, China. qunzhou.hust@gmail.com
authors.forename: Qun
authors.initials: Q
authors.lastname: Zhou
authors.forename: Jingjing
authors.initials: J
authors.lastname: Wang
authors.forename: Beidi
authors.initials: B
authors.lastname: Meng
authors.forename: Junqi
authors.initials: J
authors.lastname: Cheng
authors.forename: Guoping
authors.initials: G
authors.lastname: Lin
authors.forename: Jiachun
authors.initials: J
authors.lastname: Chen
authors.forename: Dan
authors.initials: D
authors.lastname: Zheng
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Yu
mesh_terms: D000383:Agriculture / Q000706:statistics & numerical data; D002681:China; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000706:statistics & numerical data; D006581:Hexachlorobenzene / Q000032:analysis; D001556:Hexachlorocyclohexane / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012987:Soil; D012989:Soil Pollutants; D006581:Hexachlorobenzene; D001556:Hexachlorocyclohexane