Total nitrogen and pH-controlled chemical speciation, bioavailability and ecological risk from Cd, Cr, Cu, Pb and Zn in the water level-fluctuating zone sediments of the Three Gorges Reservoir
Total nitrogen and pH-controlled chemical speciation, bioavailability and ecological risk from Cd, Cr, Cu, Pb and Zn in the water level-fluctuating zone sediments of the Three Gorges Reservoir
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三峡水库消落带沉积物中Cd、Cr、Cu、Pb、Zn的总氮和pH控制的化学形态、生物有效性和生态风险
DOI：
10.1080/09542299.2017.1335179
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发表时间：
2017-01-01
影响因子：
--
通讯作者：
Zhao, Qiao-hua
中科院分区：
文献类型：
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作者：
He, Li-ping;Liu, Dan;Zhao, Qiao-hua
摘要研究了三峡水库主、支流消落带中Cd、Cr、Cu、Pb、Zn的分布和化学形态。采用潜在生态风险指数（RI）、风险评价准则（RAC）和次生相/原生相比值（RSP）评价了重金属的生态风险和污染水平。研究结果表明，支流中重金属总量和生物有效态含量均高于MS。MS和ZX站点均表现为Cd中度污染和Pb轻度污染，而MX站点表现为Cd重度污染和Cr、Pb轻度污染。结果表明，在本研究区，Cd的生态风险高于其他重金属。沉积物的pH值和氮含量可能对重金属生物有效性起关键控制作用，从而导致更高的潜在生态风险。
Abstract We investigated the distribution and chemical speciation of Cd, Cr, Cu, Pb and Zn in the water level-fluctuating (WLF) zone of the main stream (MS) and tributaries (ZX and MX) of the Three Gorges Reservoir. We evaluated the ecological risk and pollution level from heavy metals based on the Potential Ecological Risk Index (RI), Risk Assessment Code (RAC), and Ratio of Secondary Phase and Primary Phase (RSP). Our results indicated that the total and bio-available heavy metal contents were higher in the tributaries than in the MS. Moderate pollution from Cd and light pollution from Pb were observed both at the MS and ZX sites, whereas the MX site exhibited a pattern of heavy Cd pollution and light Cr and Pb pollution. In our study area, the results indicated that Cd exhibited a higher ecological risk than did the other heavy metals. Finally, the pH and nitrogen content of sediments may play a key role in controlling the amount of heavy metal bioavailability, further inducing a higher potential ecological risk.