title: Composition and distribution of organochlorine pesticide residues in surface sediments from the Wu-Shi River Estuary, Taiwan.
abstract: The contamination of organochlorine pesticides (OCPs) in sediments from the Wu-Shi River estuary was investigated to evaluate the pollution potentials and distribution of OCPs in central Taiwan. A total of 19 sediment samples were collected at five sampling stations along the River estuary. The concentrations of OCPs were in the range of 0.99-14.5 ng/g-dry weight (dw) for sigmaHCH (alpha-, beta-, gamma-, delta-HCH), 0.46-13.4 ng/g-dw for sigma cyclodiene and 0.53-11.4 ng/g-dw for sigmaDDT (p,p'-DDD, p,p'-DDE, p,p'-DDT). The mean concentrations of sigmaHCH, sigma cyclodiene and sigmaDDT were 3.79, 4.87 and 2.51 ng/g-dw, respectively. The total concentrations of OCPs correspond to 1.73-71.9 microg/g-OC when normalized to TOC contents. Among the organochlorine pesticides, endosulfan sulfate, beta-HCH, and p,p'-DDD were the most dominant compounds in the sediments with the average concentrations of 1.97, 3.43 and 2.08 ng/g, respectively. Also, different contamination patterns among sampling seasons were observed. The measured concentrations of OCPs collected in spring were higher than those in autumn and winter. A linear relationship between sediment characteristics and OCP residues was also demonstrated. The results obtained in this study show that there still exist a variety of organochlorine pesticide residues in the sediments from the near shore of central Taiwan.
authors.affiliation: Department of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, ROC. radoong@mx.nthu.edu.tw
authors.forename: Ruey-An
authors.initials: RA
authors.lastname: Doong
authors.forename: Chin-Kai
authors.initials: CK
authors.lastname: Peng
authors.forename: Yuh-Chang
authors.initials: YC
authors.lastname: Sun
authors.forename: Pei-Lin
authors.initials: PL
authors.lastname: Liao
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012621:Seasons; D013624:Taiwan; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D010573:Pesticide Residues; D014874:Water Pollutants, Chemical