Benthic trace metal fluxes in a heavily contaminated bay in China: Does the sediment become a source of metals to the water column?
Benthic trace metal fluxes in a heavily contaminated bay in China: Does the sediment become a source of metals to the water column?
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中国严重污染海湾的底栖微量金属通量：沉积物是否成为水体金属的来源？
DOI：
10.1016/j.envpol.2019.113494
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发表时间：
2019-11
影响因子：
8.9
通讯作者：
Shi Xuefa
中科院分区：
文献类型：
--
作者：
Li Li;Zhen Xiaotong;Wang Xiaojing;Ren Yijun;Hu Limin;Bai Yazhi;Liu Jihua;Shi Xuefa
在三个不同的季节，从曾经严重污染的锦州湾采集海水、孔隙水和沉积物样本，定量评估近三十年来河流/污水排放减少后的底栖生物微量金属通量。报道了海水、表层沉积物中痕量金属的空间分布规律，以及短沉积物岩心孔隙水和固相金属的垂直分布规律。金州湾海水和沉积物中重金属Cd、Zn含量均高于渤海其他海域。Zn、Ni、Pb和Co从沉积物到水柱的底栖生物通量均为平均，对锦州湾现有存量的贡献分别为0.5%、0.3%、1.4%和14%。海水和孔隙水以及底栖生物通量也存在季节差异。总的来说，底栖生物通量和孔隙水浓度在夏季都趋于较高，这表明底栖生物通量与沉积物-水界面的温度依赖性有机质降解过程密切相关。目前，锦州湾水域中微量金属的主要来源显然还有其他来源，可能是河流/污水排放。对于Cd和Cu，水柱中的浓度每年都保持在较高水平，这表明沉积物仍然起着汇的作用。相反，对于Pb、Zn、Co和Ni，沉积物开始成为水柱的来源。虽然这可能还不是很重要，但随着时间的推移，它将变得越来越重要，并可能持续数百年至数千年。
Over three different seasons, seawater, porewater and sediment samples were collected from Jinzhou Bay, a previously heavily contaminated bay, to quantitatively assess the benthic flux of trace metals after a reduction in fluvial/sewage discharge for almost three decades. The spatial distribution patterns of trace metals in seawater, surface sediment, as well as the vertical distribution patterns of metals in porewater and solid phases in short sediment cores were reported. Metal concentrations in seawater and sediment all showed much higher Cd and Zn concentrations inside the Jinzhou Bay compared to the rest of Bohai Sea area. Zn, Ni, Pb and Co all had average benthic fluxes coming out of the sediments to the water column, contributing about 0.5%, 0.3%, 1.4% and 14% to their current standing stock in Jinzhou Bay. Seasonal difference was also identified in seawater and porewater, as well as in the benthic fluxes. In general, benthic fluxes and porewater concentrations all tended to be higher in summer, implying a close relationship between benthic flux and the temperature-dependent organic matter degradation process at the sediment-water interface.Currently, there are clearly still other sources, possibly fluvial/sewage discharge, as the main source of trace metals in Jinzhou Bay waters. For Cd and Cu, concentrations in the water column remain high on an annual basis indicating that sediment still acts as a sink. Conversely, for Pb, Zn, Co, and Ni, the sediment is beginning to act as a source to the water column. Although this may not yet be significant, it will become more and more important with time, and can last for hundreds to thousands of years.
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影响因子：
11.4
作者：
S. Squire;G. Scelfo;J. Revenaugh;A. Flegal
通讯作者：
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影响因子：
3.4
作者：
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通讯作者：
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影响因子：
3
作者：
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通讯作者：
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影响因子：
9.8
作者：
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通讯作者：
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DOI：
10.1029/2007eo470014
发表时间：
2007-11
期刊：
Eos, Transactions American Geophysical Union
影响因子：
--
作者：
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通讯作者：
T. Bianchi