College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
Mar Pollut Bull. 2018 Jun;131(Pt A):602-610. doi: 10.1016/j.marpolbul.2018.04.055. Epub 2018 May 3.
Trophodynamics and chiral signatures of organochlorine pesticides (OCPs), including dichlorodiphenyltrichloroethanes (DDTs), hexachlorocyclohexanes (HCHs), and chlordanes in a food web from Zhoushan Fishing Ground, China, were studied. Residues of OCPs in all teleost fishes were within food safety levels. Strong positive correlations were found between trophic levels (TLs) and wet weight concentrations of target chemicals, with trophic magnification factors (TMFs) from 4.17 to 9.77. Lipid contents and TLs significantly correlated, which indirectly affect the bioaccumulation processes of OCPs. The consistently racemic EF values of α-HCH, as well as invariability of the relative proportions of HCH isomers in different marine species implied that HCHs in animals originate directly from the surrounding environment. However, in vivo biotransformation and/or elimination of o,p'-DDT cannot be precluded. TMFs of the individual enantiomers further suggest that the influence of achiral biotransformation is too minor to induce enantioselective biomagnification of chiral OCPs through the studied food web.
研究了中国舟山渔场食物网中有机氯农药（OCPs），包括滴滴涕（DDTs）、六氯环己烷（HCHs）和氯丹的营养动力学和手性特征。所有硬骨鱼类中 OCPs 的残留均在食品安全水平之内。目标化学物质的湿重浓度与营养水平（TL）之间存在强烈的正相关关系，营养放大因子（TMF）从 4.17 到 9.77。脂质含量和 TL 显著相关，这间接影响了 OCPs 的生物累积过程。α-HCH 的一致外消旋 EF 值，以及不同海洋物种中 HCH 异构体比例的不变性，表明动物体内的 HCHs 直接来源于周围环境。然而，不能排除 o,p'-DDT 的体内生物转化和/或消除。单个对映体的 TMF 进一步表明，非手性生物转化的影响太小，无法通过研究的食物网诱导手性 OCPs 的对映体选择性生物放大。
