title: Organochlorine pesticides in soils around Guanting Reservoir, China.
abstract: Fifty-six representative samples of topsoil were collected around Guanting Reservoir, which is an important water source for Beijing. Concentrations of the insecticides HCH, DDT, and their metabolites were quantified by use of gas chromatography (GC) with electron capture detection (ECD). Organochlorine pesticides (OCPs) are still present in surface soils in the Guanting area. DDT accounts for about 93% of the total OCP content. Concentrations of alpha/gamma, beta/gamma, and DDT/DDE are the result not only of historical use, but also of more recent depositions. Statistical analyses, including principal component analysis (PCA) and cluster analysis (CA), revealed associations between concentrations of OCPs and major soil characteristics. Geographical information system (GIS) technology was used to develop maps of the distributions of OCP concentrations. The areas of greatest contamination were primarily in the central part of the study area and were correlated with greater population density, heavier traffic, and more industrial activity.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, 100085, China.
authors.forename: Tieyu
authors.initials: T
authors.lastname: Wang
authors.forename: Yonglong
authors.initials: Y
authors.lastname: Lu
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Shi
authors.forename: John P
authors.initials: JP
authors.lastname: Giesy
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
mesh_terms: D002681:China; D002849:Chromatography, Gas; D016000:Cluster Analysis; D003634:DDT / Q000032:analysis* / Q000378:metabolism; D003633:Dichlorodiphenyl Dichloroethylene / Q000032:analysis; D004784:Environmental Monitoring; D040362:Geographic Information Systems; D001556:Hexachlorocyclohexane / Q000032:analysis* / Q000378:metabolism; D007306:Insecticides / Q000032:analysis* / Q000378:metabolism; D015999:Multivariate Analysis; D010573:Pesticide Residues / Q000032:analysis*; D025341:Principal Component Analysis; D012989:Soil Pollutants / Q000032:analysis*