湖南某铅锌矿土壤重金属形态分析及淋溶液pH值对其淋滤的影响
发布时间：2018-07-29 21:03
【摘要】：为了解有色金属矿区土壤重金属形态及pH值对其迁移的影响,选取对土壤环境影响较大的Hg、Pb、Zn、Cr、Cd、Cu元素进行研究。采用欧共体参比司的三步连续提取法研究了某铅锌矿区周边农田10个土壤样品中重金属的形态分布,根据重金属形态中酸可提取态重金属的百分比,可得6种重金属的迁移能力大小顺序为CdZnCrCuPbHg;用2.3、4.1、5.6、7.2四个不同pH值的淋滤液淋溶尾砂矿柱50 d,检测数据显示,酸度的提高可以显著促进尾矿砂中重金属(Pb、Zn、Cu和Cd)的溶出;除Zn元素外,其他元素在50 d内的溶出量均随时间的推移而降低。根据不同检测时间段内淋溶液溶浸出的重金属元素含量分析可知,重金属对酸性淋滤的敏感程度顺序为CuPbZnCd。综合分析得出该农田重金属污染严重程度顺序为ZnCdPbCuHgCr。
[Abstract]:In order to understand the effects of heavy metal morphology and pH value on the migration of heavy metals in non-ferrous metal mining areas, the elements of HgPbPbPbZnCrCrOCDCu, which have a great influence on the soil environment, were selected to study the effects of heavy metals on their migration. The speciation and distribution of heavy metals in 10 soil samples from farmland around a lead-zinc mining area were studied by using the three-step continuous extraction method of the European Community reference Company. The percentage of acid-extractable heavy metals in heavy metal forms was determined. The order of migration ability of six heavy metals was CdZnCrCuPbHg, and the leaching of tailings pillar with 2.3L 4.1U 5.67.2 different pH value was used for 50 days. The test data showed that the increase of acidity could significantly promote the dissolution of heavy metals (PbZN Cu and CD) in tailings, except for Zn. The dissolution of other elements decreased with the passage of time. According to the analysis of heavy metal content in leaching solution during different detection periods, the sensitivity of heavy metals to acid leaching is in the order of CuPbZnCd. The order of heavy metal pollution in this farmland is ZnCdPbCuHgCr.
【作者单位】： 中南大学资源与安全工程学院;
【基金】：国家自然科学基金重点项目(51534008)
【分类号】：X53;X753
，
本文编号：2154011
[Abstract]:In order to understand the effects of heavy metal morphology and pH value on the migration of heavy metals in non-ferrous metal mining areas, the elements of HgPbPbPbZnCrCrOCDCu, which have a great influence on the soil environment, were selected to study the effects of heavy metals on their migration. The speciation and distribution of heavy metals in 10 soil samples from farmland around a lead-zinc mining area were studied by using the three-step continuous extraction method of the European Community reference Company. The percentage of acid-extractable heavy metals in heavy metal forms was determined. The order of migration ability of six heavy metals was CdZnCrCuPbHg, and the leaching of tailings pillar with 2.3L 4.1U 5.67.2 different pH value was used for 50 days. The test data showed that the increase of acidity could significantly promote the dissolution of heavy metals (PbZN Cu and CD) in tailings, except for Zn. The dissolution of other elements decreased with the passage of time. According to the analysis of heavy metal content in leaching solution during different detection periods, the sensitivity of heavy metals to acid leaching is in the order of CuPbZnCd. The order of heavy metal pollution in this farmland is ZnCdPbCuHgCr.
【作者单位】： 中南大学资源与安全工程学院;
【基金】：国家自然科学基金重点项目(51534008)
【分类号】：X53;X753
，
本文编号：2154011
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