title: Historical contamination and ecological risk of organochlorine pesticides in sediment core in northeastern Chinese river.
abstract: Twenty-eight surface sediment samples and one sediment core were analyzed for 21 organochlorine pesticides (OCPs), in order to provide extensive information of distribution, sources, pollution history and ecological risk of these OCP compounds in Daling River area, China. The results showed that hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) were the most frequently detected contaminants in the surface sediment samples with concentrations (in ngg(-1) dry weight (dw)) from 1.1 to 30 and from 2.2 to 45, respectively. Analysis of variance showed significant (P<0.05) differences between HCHs and DDTs residues in surface sediment sampled from the various locations. Residues of HCHs and DDTs in sediment core (in ngg(-1)dw) ranged from 2.1 to 18 and 9.1 to 53, respectively. The temporal trends of HCHs and DDTs concentrations in the sediment core were affected by application history, emission and soil residues. Compositional analysis of HCHs and DDTs indicated that new sources were lindane and dicofol mainly due to agricultural activities. Additionally, based on the available sediment quality guidelines, slight potential health risks of DDTs may exist to benthic organisms in Daling River and Bohai Sea.
authors.affiliation: International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), Dalian Maritime University, Dalian, PR China.
authors.forename: Luo
authors.initials: L
authors.lastname: Wang
authors.forename: Hongliang
authors.initials: H
authors.lastname: Jia
authors.forename: Xianjie
authors.initials: X
authors.lastname: Liu
authors.forename: Yeqing
authors.initials: Y
authors.lastname: Sun
authors.forename: Meng
authors.initials: M
authors.lastname: Yang
authors.forename: Wenjun
authors.initials: W
authors.lastname: Hong
authors.forename: Hong
authors.initials: H
authors.lastname: Qi
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Li
mesh_terms: D002681:China; D004463:Ecology; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D001556:Hexachlorocyclohexane / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D009792:Oceans and Seas; D010575:Pesticides / Q000032:analysis*; D045483:Rivers / Q000737:chemistry; D012987:Soil; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012987:Soil; D014874:Water Pollutants, Chemical; D001556:Hexachlorocyclohexane