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首页> 外文期刊>Environmental Science and Pollution Research >Chemical fractionation and risk assessment of surface sediments in Luhun Reservoir, Luoyang city, China
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Chemical fractionation and risk assessment of surface sediments in Luhun Reservoir, Luoyang city, China

机译:罗村水库表面沉积物的化学分级及风险评估,洛阳市洛阳市

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To understand the potential risks of heavy metals, including their bioavailability and toxicity, 15 surface sediment samples were collected from Luhun Reservoir in Luoyang city, China. Total concentrations and chemical fractions of Cd, Cr, Cu, Ni, Pb, and Zn were analyzed. Various rating methods were used to evaluate the degree, risk, and toxicity of the heavy metal pollution. Results showed that Cd and Pb were preferentially associated with exchangeable (55.77-69.76%) and reducible (53.54-69.43%) fractions, respectively, and therefore exhibited high potential availability. Cr (57.14-86.56%) and Ni (32.21-72.77%) occurred primarily in the residual fraction. Metal concentrations in the effective fraction of the sediment decreased in the order: Cd (96.32%) > Pb (91.61%) > Cu (64.54%) > Zn (57.23%) > Ni (41.51%) > Cr (21.68%). Risk assessment indicated that the risk for Cd is extremely high (62.96%); Cu, Pb, and Zn are ranked as medium risk. Based on the potential ecological risk index, these metals (especially Cd) showed higher potential risk near the dam region. Toxic unit values (2.89-6.05) in more than 60% of sediment sites exceeded a value of 4, and Pb had a relatively higher contribution (1.06-2.65). Cd and Pb are the main contaminants in sediments of Luhun Reservoir and should be paid more attention in the future.
机译:为了了解重金属的潜在风险,包括它们的生物利用度和毒性,从洛阳市罗润水库收集了15种表面沉积物样本。分析了CD,Cr,Cu,Ni,Pb和Zn的总浓度和化学级分。各种评级方法用于评估重金属污染的程度,风险和毒性。结果表明,CD和Pb优先与可交换(55.77-69.76%)和可再造成(53.54-69.43%)级分相关,因此表现出高潜在的可用性。 Cr(57.14-86.56%)和Ni(32.21-72.77%)主要发生在残留部分。沉积物的有效级分中的金属浓度有序下降:CD(96.32%)> Pb(91.61%)> Cu(64.54%)> Zn(57.23%)> Ni(41.51%)> Cr(21.68%)。风险评估表明CD的风险极高(62.96%); Cu,Pb和Zn被排名为中等风险。基于潜在的生态风险指数,这些金属(特别是CD)在坝区附近显示出更高的潜在风险。超过60%的沉积物位点的有毒单位值(2.89-6.05)超过了4的值,PB贡献相对较高(1.06-2.65)。 CD和Pb是鲁恒水库沉积物中的主要污染物,应在未来得到更多关注。

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