Deposition flux and mass inventory of polychlorinated biphenyls in sediments of the Yangtze River Estuary and inner shelf, East China Sea: Implications for contributions of large-river input and e-waste dismantling
Deposition flux and mass inventory of polychlorinated biphenyls in sediments of the Yangtze River Estuary and inner shelf, East China Sea: Implications for contributions of large-river input and e-waste dismantling
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长江口和东海内陆架沉积物中多氯联苯的沉积通量和质量库存：对大河输入和电子垃圾拆解贡献的影响
DOI：
10.1016/j.scitotenv.2018.08.076
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发表时间：
2019
影响因子：
9.8
通讯作者：
Lin Tian
中科院分区：
文献类型：
--
作者：
Zhao Tiange;Guo Zhigang;Yao Peng;Hu Limin;Wu Zilan;Lin Tian
以长江口至东海陆架泥质区表层沉积物样品为研究对象，从空间分布、沉积通量和总量等方面对多氯联苯（PCBs）的来源和归宿进行了综合研究。32种多氯联苯的总浓度为0.3 - 11.9纳克/克干重。在强水动力条件下，长江三峡库区TOC或MD与32PCB浓度之间的相关性较弱。相比之下，有相对较好的关系，多氯联苯与TOC含量和沉积物粒度的内部货架的ECS由于水文分选的影响，从YRE的内部货架的ECS。这表明长江输入对PCBs在沿海ECS中的分布起着相当大的控制作用。与长江入海PCBs的年排放量（3.21 t/a）相比，长江入海PCBs的沉积通量约为2.63 t/a。此外，沉积物中50吨的总质量库存表明，YRE和ECS的内陆架泥是一个重要的全球多氯联苯汇。据估计，21 - 39%的沉积多氯联苯来自本地排放（主要是电子废物的拆解），除了长江输入。在浙江中部海岸附近也观察到了较高比例的五氯苯，这进一步证明了沿海附近电子废物拆解的本地排放是沿海ECS沉积多氯联苯的重要贡献者。
Surface sediment samples were collected from the Yangtze River Estuary (YRE) to the inner-shelf mud area of the East China Sea (ECS) for a comprehensive study of the sources and fates of polychlorinated biphenyls (PCBs) based on their spatial distribution, deposition flux, and mass inventory. The total concentrations of 32 PCBs (Σ32PCBs) varied from 0.3 to 11.9 ng/g dry weight. Under strong hydrodynamic conditions, the weak correlations between TOC or MD and Σ32PCB concentrations were observed in the YRE. In contrast, there were relatively well relationships of PCBs with TOC content and sediment grain size in the inner shelf of the ECS due to the influence of hydrological sorting from the YRE to the inner shelf of the ECS. This suggests that the Yangtze River input plays a considerable role in controlling the distribution of PCBs in the coastal ECS. Compared with the annual discharge of Σ32PCBs from the Yangtze River to the sea (3.21 t/yr), the deposition flux was estimated to be ~2.63 t/yr. Furthermore, a total mass inventory of 50 tons in the sediments suggests that the YRE and inner shelf mud of the ECS represents an important global sink of PCBs. Estimated 21–39% of sedimentary PCBs were derived from local emissions (mainly dismantling of electronic waste) aside from Yangtze River input. Higher proportions of penta-CBs were also observed near the central Zhejiang Coast, providing further evidence that the local emission from e-waste dismantling near the coast is a significant contributor to sedimentary PCBs in the coastal ECS.