New insights into the transfer and accumulation of dioxins and dioxin-like PCBs in the food web of farmed Chinese mitten crabs: A typical case from the Yangtze River area

文献类型： 外文期刊

第一作者： Rao, Qinxiong

作者： Rao, Qinxiong;Wang, Xianli;Zhang, Qicai;Li, Huaxi;Deng, Zhongsheng;Song, Weiguo;Cheng, Lin;Liu, Xing;Guan, Shuhui;Song, Wei;Yao, Chunxia;Chen, Shanshan;Zhou, Jiaxin;Rao, Qinxiong;Wang, Xianli;Zhang, Qicai;Li, Huaxi;Deng, Zhongsheng;Song, Weiguo;Cheng, Lin;Liu, Xing;Guan, Shuhui;Song, Wei;Yao, Chunxia;Chen, Shanshan;Zhou, Jiaxin;Hoogenboom, Ron

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关键词： Dioxins; DL-PCBs; Chinese mitten crab; Transfer route; Bioaccumulation

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：14.224； 五年影响因子：12.984 ）

ISSN： 0304-3894

年卷期： 2022 年 436 卷

页码：

收录情况： SCI

摘要： Dioxins and dioxin-like polychlorinated biphenyls (DL-PCBs) transfer and accumulation behavior remains poorly understood in the farmed Chinese mitten crab (Eriocheir sinensis). In this study, dioxins and DL-PCBs concentration in 48 farming crabs in lower reaches of the Yangtze River was monitored and controlled field design was conducted in a typical farm to dissect the dioxins and DL-PCBs contamination in crab food web (crab, feeds, and environment). Results showed that dioxins and DL-PCBs were ubiquitous in farmed crabs with concentrations ranging from 0.390 to 37.2 pg toxic equivalents (TEQ) g(-1) ww and do not present a health risk to general consumers. Of the total dioxins TEQ found in crab in treated farms, 45.6% was attributed to direct transfer from the aquaculture environment and 46.5% to the consumption of snails. Consumption of feed material accounted for nearly all of the total DL-PCBs TEQ, divided as 58.2% from feed and 41.8% from snails. These results demonstrated that dominant routes of dioxins accumulation in crabs were transferred for the sediment-snail-crab and sediment-crab chains, whereas DL-PCBs is mainly transferred through consumption of feeds and snails. To our knowledge, this work is the first report of snails serving as a biomagnification medium that promotes accumulation of dioxins in mitten crabs. This observation provided crucial insight to prevent and reduce contamination of crab by dioxins and DL-PCBs.

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