乐昌铅锌矿区水道底泥中的重金属潜在生态风险评价

Evaluation on Potential Ecological Risk of Heavy Metals in Waterway Sediments of Lechang Lead-zinc Mine Area

调查了乐昌铅锌矿区霜降河与武江乐昌段水道底泥中的重金属污染现状,对其潜在的生态风险进行了评价。结果表明,采选矿废水排泄水道和霜降河底泥中的重金属含量远远超过当地的背景值和全国的背景值,武江与霜降河水汇合后底泥中的重金属含量超过当地背景值的程度较轻;采选矿废水排泄水道和霜降河底泥中重金属的潜在生态风险已达到非常高的程度,分析认为乐昌铅锌矿的采选废水是当地水道底泥中重金属的主要污染源。

The present status of heavy metal pollution in sediments of the wastewater discharge channel of Lechang Lead-zinc Mine Area, Shuangjiang River and Lechang Segment of Wujiang River was investigated, and the potential ecological risk was evaluated. The results indicate that the heavy metal concentrations in sediments of the wastewater discharge channel from mining and beneficiation and Shuangjiang River are well above local and national corresponding background values while the heavy metal concentrations in sediments of the confluence of Wujiang River and Shuangjiang River are slightly above the above-mentioned values. The potential ecological risk of heavy metals in sediments of the wastewater discharge channel from mining and beneficiation and Shuangjiang River reaches a very high level. It is considered by analysis that the wastewater from mining and beneficiation of Lechang Lead-zinc Mine is the main contamination source of heavy metals in the local waterway sediments.