title: Residues and chiral signatures of organochlorine pesticides in sediments from Xiangshan Bay, East China Sea.
abstract: Residual levels and enantiomeric signatures of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in surface sediments from Xiangshan Bay, East China Sea were investigated. The concentrations of ∑HCHs (sums of α-, β-, γ-, and δ-HCH) and ∑DDTs (sums of p, p'-DDT, p, p'-DDD,p, p'-DDE, o, p'-DDT, and o, p'-DDD) ranged from 0.14 to 0.67 ng g⁻¹ and 0.61 to 22.38 ng g⁻¹, respectively. A slight potential health risk to the organism was then indicated for the residual levels of DDTs according to the ERL/ERM guidelines. Moreover, the predominant β-HCH implied that the technical HCH contamination was mainly due to the historical usage. But the high ratio of DDT/∑DDTs depicted a cocktail input pattern of fresh and weathered DDTs. The enantiomeric fractions (EFs) of α-HCH, o, p'-DDT, and o, p'-DDD were also determined. The degradation of α-HCH was enantioselective in all sediments samples, resulting in an enrichment of (-)-enantiomers. However, the racemic residues of o, p'-DDT and o, p'-DDD were observed in all sediments samples.
authors.affiliation: International Joint Research Center for Persistent Toxic Substances, Zhejiang University of Technology, Hangzhou, China.
authors.forename: Yun H
authors.initials: YH
authors.lastname: Yang
authors.forename: Shan S
authors.initials: SS
authors.lastname: Zhou
authors.forename: Yuan Y
authors.initials: YY
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: Xue
authors.forename: Teng
authors.initials: T
authors.lastname: Liu
mesh_terms: D002681:China; D003634:DDT / Q000737:chemistry*; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D001556:Hexachlorocyclohexane / Q000737:chemistry*; D009792:Oceans and Seas; D010573:Pesticide Residues / Q000737:chemistry*; D013237:Stereoisomerism; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D014874:Water Pollutants, Chemical; D001556:Hexachlorocyclohexane; D003634:DDT