title: Residues and enantiomeric profiling of organochlorine pesticides in sediments from Yueqing Bay and Sanmen Bay, East China Sea.
abstract: The spatial distributions and chiral signals of organochlorine pesticides (OCPs) in surface sediments from Yueqing Bay and Sanmen Bay, East China Sea were investigated. The total OCPs concentrations ranged from 2.11 to 18.15 ng g(-1) dry weight for all the sampling stations. HCHs and DDTs were dominant, although trans-chlorodane/cis-chlorodane were also observed in some sites. The predominant beta-HCH and the alpha-HCH/gamma-HCH ratios indicated that the residues of HCHs in these places mainly originated from the historical usage of technical HCH. However, the ratios of (DDE+DDD)/DDT reflected a cocktail input pattern of fresh and weathered DDTs. Based on ERL/ERM guidelines, p,p'-DDT and SigmaDDT posed a small risk to the bottom-dwelling consumers, while p,p'-DDD, p,p'-DDE and Sigmachlorodane were not found at concentrations expected to adversely affect sediment biota. Enantiomeric analysis showed that the degradation of chiral OCPs was enantioselective, resulting in enrichment of (-)-enantiomers for alpha-HCH, o,p'-DDT and o,p'-DDD in all samples. These results implied that the sediment quality guidelines of chiral OCPs should be reassessed using concentrations of their individual enantiomers.
authors.affiliation: International Joint Research Center for Persistent Toxic Substances, Research Center of Environmental Sciences, College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
authors.forename: Huayun
authors.initials: H
authors.lastname: Yang
authors.forename: Bin
authors.initials: B
authors.lastname: Xue
authors.forename: Peng
authors.initials: P
authors.lastname: Yu
authors.forename: Shanshan
authors.initials: S
authors.lastname: Zhou
authors.forename: Weiping
authors.initials: W
authors.lastname: Liu
mesh_terms: D002681:China; D003634:DDT / Q000737:chemistry; D003633:Dichlorodiphenyl Dichloroethylene / Q000737:chemistry; D003632:Dichlorodiphenyldichloroethane / Q000737:chemistry; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D009792:Oceans and Seas; D010573:Pesticide Residues / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*; D013237:Stereoisomerism; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D010575:Pesticides; D014874:Water Pollutants, Chemical; D003633:Dichlorodiphenyl Dichloroethylene; D003634:DDT; D003632:Dichlorodiphenyldichloroethane