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电子垃圾拆解区污染池塘中鱼类多氯联苯及其代谢产物的组织分配及暴露风险
Polychlorinated Biphenyls and Their Methylsulfonyl Metabolites in Fish from an Electronic Waste Recycling Site in South China: Tissue Distribution and Human Dietary Exposure

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文摘 对一受电子垃圾污染池塘内两种鱼类(鲮鱼和乌鳢)体内各组织中多氯联苯(PCBs)及其甲磺基代谢产物(MeSO_2-PCBs)进行了分析.鲮鱼和乌鳢体内各组织中总PCBs(∑PCBs)的平均含量分别为560~10462ng·g~(-1)和580~50492 ng·g~(-1)(湿重),两种鱼体内肝脏中的PCBs含量均高于其他组织. PCBs在鱼体组织内的分布与不同组织的脂肪含量有关. 鲮鱼和乌鳢体内各组织中∑MeSO_2-PCBs的平均含量分别为0.44~53 ng·g~(-1)和1.86~132 ng·g~(-1),这一浓度水平比之前国外报道的最高浓度高1个数量级. 除PCB149外,鲮鱼体内手性PCB单体的EF值与沉积物相比存在下降趋势; 而在乌鳢体内则正相反,在鲮鱼体内已下降的EF值在乌鳢体内则出现回升,有些单体的EF值甚至高于沉积物. 这一结果可能表明PCBs在两种鱼体内的手性选择性代谢特征正好相反. 鱼体内高含量的 ∑PCBs和 ∑MeSO_2-PCBs对当地居民具有较高的暴露风险,因此,限制这些鱼类在市场的流通对于降低当地居民健康风险具有重要意义.
其他语种文摘 In the present study, we determined polychlorinated biphenyls and their methylsulfonyl metabolites (MeSO_2-PCBs) in the tissues of two fish species-mud carp and northern snakehead-from a natural pond in an electronic waste recycling site in the Pearl River Delta,Southern China. The mean concentrations of PCBs (∑PCBs)varied from 560 to 10462 ng·g~(-1) wet weight, and from 580 to 50492 ng·g~(-1)wet weight in the tissues of mud carp and northern snakehead, respectively, with the highest levels found in the liver. Lipid contents played an important role in the determination of tissue distribution of PCBs. The mean concentrations of∑MeSO_2-PCBs varied between 0.44 and 53 ng·g~(-1)wet weight in tissues of mud carp, while varied between 1.86 and 132 ng·g~(-1)wet weight in northern snakehead. These levels were one order of magnitude greater than the highest levels of MeSO_2-PCBs previously reported in fish. The EF values of chiral PCBs in mud carp were lower than those in the sediments, with an exception of PCB149. However, the declined EFs in mud carp were rebounded in northern snakehead, and some values were even higher than those in the sediment. This result may suggest that the mud carp and the northern snakehead preferred to biotransform different enantiomers of PCB congeners. The elevated levels of ∑PCBs and∑MeSO_2-PCBs detected in the present study indicated a high exposure risk to the local residents. Restricting the consumption of these fish in the local markets is important and essential for reducing the health risks to local residents.
来源 环境科学 ,2014,35(12):4655-4662 【核心库】
DOI 10.13227/j.hjkx.2014.12.032
关键词 多氯联苯 ; 甲磺基代谢产物 ; 组织分配 ; 对映体选择性代谢 ; 暴露风险
地址

中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 0250-3301
学科 环境科学基础理论;环境质量评价与环境监测
基金 国家环境保护公益性行业科研专项 ;  国家自然科学基金项目
文献收藏号 CSCD:5298891

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引证文献 6

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