赣南某钨矿区土壤重金属污染生态风险评价
发布时间：2019-06-21 07:47
【摘要】：对赣南某钨矿区及周边农田土壤重金属的污染进行调查,分析了2个尾矿堆积区及17个农田采样区土壤中重金属Pb、Cr、Mn、Zn、Cu和Cd的总量和形态,采用潜在生态危害指数法和RAC风险评价法对研究区域土壤重金属的生态风险进行评价.结果表明,尾矿堆积区尾砂中6种重金属远远超过江西省土壤背景值和国家土壤环境质量二级标准,土壤重金属浓度水平分布表现为尾矿堆积区尾矿附近农田土壤矿区周边农田土壤.形态分析结果显示矿区农田土壤中6种重金属主要以可还原态、可氧化态和残渣态存在,尾矿附近农田土壤重金属Pb、Mn、Zn和Cd酸溶态占比均大于10%,具有较强的生物有效性.潜在生态危害指数评价表明研究区域表层(0—20 cm)和中层(20—40 cm)土壤存在极强的重金属生态危害,Cd是土壤重金属潜在生态风险主要的贡献因子.RAC风险评价结果表明,尾矿附近农田0—40 cm土壤中Zn和Cd存在的生态风险较大,而矿区周边农田0—40 cm土壤中Cd和Mn存在的生态风险相对较大.综合基于重金属总量分析的潜在生态风险指数和基于重金属有效态的RAC评价结果,Cd、Zn和Mn的污染是研究区域土壤污染风险控制需要关注的重点.
[Abstract]:The pollution of heavy metals in soil of a tungsten mining area and its surrounding farmland in southern Jiangxi was investigated. The total amount and form of heavy metals Pb,Cr,Mn,Zn,Cu and Cd in soil of 2 tailings accumulation areas and 17 farmland sampling areas were analyzed. The ecological risk of heavy metals in the study area was evaluated by potential ecological hazard index method and RAC risk assessment method. The results showed that the six kinds of heavy metals in tailings accumulation area far exceeded the soil background value of Jiangxi Province and the second grade standard of national soil environmental quality, and the distribution of soil heavy metal concentration was farmland soil around farmland soil mining area near tailings accumulation area. The results of morphological analysis showed that the six kinds of heavy metals in farmland soil were mainly reducable, oxidizing and residual. The proportion of Pb,Mn,Zn and Cd acid soluble state in farmland soil near tailings was more than 10%, which had strong bioavailability. The evaluation of potential ecological hazard index showed that there were strong ecological hazards of heavy metals in the surface (0 鈮，
本文编号：2503908
[Abstract]:The pollution of heavy metals in soil of a tungsten mining area and its surrounding farmland in southern Jiangxi was investigated. The total amount and form of heavy metals Pb,Cr,Mn,Zn,Cu and Cd in soil of 2 tailings accumulation areas and 17 farmland sampling areas were analyzed. The ecological risk of heavy metals in the study area was evaluated by potential ecological hazard index method and RAC risk assessment method. The results showed that the six kinds of heavy metals in tailings accumulation area far exceeded the soil background value of Jiangxi Province and the second grade standard of national soil environmental quality, and the distribution of soil heavy metal concentration was farmland soil around farmland soil mining area near tailings accumulation area. The results of morphological analysis showed that the six kinds of heavy metals in farmland soil were mainly reducable, oxidizing and residual. The proportion of Pb,Mn,Zn and Cd acid soluble state in farmland soil near tailings was more than 10%, which had strong bioavailability. The evaluation of potential ecological hazard index showed that there were strong ecological hazards of heavy metals in the surface (0 鈮，
本文编号：2503908
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