title: Analysis of HCHs and DDTs in a sediment core from the Old Yellow River Estuary, China.
abstract: The present study analyzed the distribution of HCHs and DDTs in a sediment core from the Old Yellow River Estuary, China. The OCP levels were detected by Soxhlet extraction followed by gas chromatography (GC) using a mass-selective detector. Sediment age was analyzed for (210)Pb using an Ortec GWL HPGe gamma spectrometer. The results indicated that the concentrations of ∑DDT in the sediment core were much lower than those of ∑HCH. Compared with the other estuarine and coastal regions in Chinese rivers, HCHs levels in this area were higher or similar, while DDTs levels were lower. The compositional analysis indicated that β-HCH and p, p'-DDD were the predominant species. The temporal trends indicated that levels of HCHs and DDTs were related with their historical usage, emission and soil residues. According to the analysis of the ratio, HCHs in this area was mainly due to the technical historical residue and recent lindane. DDTs was mainly due to historical residue. The biodegradation conditions for DDTs were anaerobic. The dicofol-type DDTs application occurred in this area.
authors.affiliation: CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, PR China; Department of Biology & Environment Engineering, Hefei University, Hefei, Anhui 230022, PR China.
authors.forename: Chunnian
authors.initials: C
authors.lastname: Da
authors.affiliation: CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, PR China. Electronic address: lgj@ustc.edu.cn.
authors.forename: Guijian
authors.initials: G
authors.lastname: Liu
authors.affiliation: CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
authors.forename: Zijiao
authors.initials: Z
authors.lastname: Yuan
mesh_terms: D002681:China; D003634:DDT / Q000032:analysis*; D004784:Environmental Monitoring; D063366:Estuaries; D001556:Hexachlorocyclohexane / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D001556:Hexachlorocyclohexane; D003634:DDT; C023888:beta-hexachlorocyclohexane
keywords: DDT; HCH; Sediment core; Sedimentary record