黔西北炼锌矿区土壤重金属形态分析及风险评价

发布时间：2018-07-20 13:06

【摘要】：为研究黔西北炼锌矿区土壤和矿渣中重金属总量及形态分布特征,采用Tessier五步连续提取法和风险评价编码法(RAC)探讨其污染程度。结果表明,除Cr和Ni外,其他各重金属平均值均超出贵州省的土壤背景值,其中Pb、Zn、Cd污染严重。形态分析表明,土壤和矿渣样品中Pb、Zn、Mn以残渣态(分别占其总量的45.91%、55.11%、42.71%)和铁锰结合态(分别占其总量的33.33%、28.26%、41.78%)为主;Cd的可交换态和碳酸盐结合态之和占总量的30.63%;Cu的有机结合态为65.11%,其次是残渣态30.79%;Cr和As则以残渣态为主要形态,平均占比均超过90%。RAC评价结果表明,矿区周边土壤中Cd元素具有极高的潜在生态风险,其他重金属潜在生态风险水平较低。
[Abstract]:In order to study the total amount and speciation distribution of heavy metals in soil and slag of zinc smelting mining area in Northwest Guizhou Province, Tessier five-step continuous extraction method and risk evaluation coding (RAC) method were used to study the pollution degree of heavy metals. The results showed that the average values of all heavy metals except Cr and Ni were higher than the soil background value of Guizhou Province, and the pollution of Pb ~ (2 +) Zn ~ (2 +) CD was serious. Morphological analysis shows that In soil and slag samples, Pb ~ (2 +) Zn ~ (2 +) mn (45.91% of the total) and Fe / mn (respectively 33.3328.262.78% of the total) in the residual state (45.91% of the total) and ferromanganese bound state (41.78% of the total) are the main exchangeable states of CD and the organic binding state of 30.63C / Cu in the total amount of carbonate-bound Cu, followed by the organic binding state of Cu (65.11%). The residual state of Cr and as is mainly in the residual state. The results showed that CD in the soil around the mining area had a high potential ecological risk, while other heavy metals had a lower potential ecological risk.
【作者单位】：环境保护部南京环境科学研究所/国家环境保护土壤环境管理与污染控制重点实验室;
【基金】：环保公益性行业科研专项(201409041,201409042) 2015年中央级公益性科研院所基本科研业务专项中国工程院全国土壤环境保护及污染防治战略咨询研究项目江苏省自然科学基金(BK20130104) 国家自然科学基金(41301278)
【分类号】：X753;X825

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