| 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 |
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| 引用本文： | 李晓艳,吴超.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[J].环境工程,2017,35(5):172-176. |
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| 作者姓名： | 李晓艳 吴超 |
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| 作者单位： | 中南大学资源与安全工程学院,长沙,410083 |
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| 基金项目： | 国家自然科学基金重点项目 |
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| 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Cd>Zn>Cr>Cu>Pb>Hg;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Cu>Pb>Zn>Cd。综合分析得出该农田重金属污染严重程度顺序为Zn>Cd>Pb>Cu>Hg>Cr。
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| 关 键 词： | 土壤 铅锌矿 重金属 形态 淋溶液 p H值 |
FRACTION DISTRIBUTION AND EFFECT OF LEACHATE pH ON THE MIGRATION OF HEAVY METALS IN SOIL AROUND A LEAD-ZINC MINE IN HUNAN PROVINCE |
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| LI Xiao-yan,WU Chao.FRACTION DISTRIBUTION AND EFFECT OF LEACHATE pH ON THE MIGRATION OF HEAVY METALS IN SOIL AROUND A LEAD-ZINC MINE IN HUNAN PROVINCE[J].Environmental Engineering,2017,35(5):172-176. |
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| Authors: | LI Xiao-yan WU Chao |
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| Abstract: | To understand the effect of soil heavy metals speciations and pH values on their migration in the soil,Hg,Pb,Zn,Cr,Cd,Cu were selected as the object.The three-step sequential extraction method by EC Reference Division was used to study the speciation distribution of the 6 heavy metals in 10 soil samples collected from the surrounding farmland of a lead-zinc mine in Hunan Province.According to the percentage of acid extractable form,the migration capacity of the 6 heavy metals was in descending order of Cd ＞ Zn ＞ Cr ＞ Cu ＞ Pb ＞ Hg.Leaching liquid with the pH value of 2.3,4.1,5.6,7.2 was used in the leaching experiment,by tailings produced pillar for 50 days.The results showed that increase in acidity could significantly increase the dissolution of heavy metals in tailings (Pb,Zn,Cu and Cd);the dissolution amount decreased with the passage of leaching time except Zn.According to the contents of heavy metals in leaching solution with time,the sensitivity of heavy metals to acid leaching was in sequence of Cu ＞ Pb ＞ Zn ＞ Cd.And the contamination extent of each heavy metal on the farmland was in sequence of Zn ＞ Cd ＞ Pb ＞ Cu ＞ Hg ＞ Cr. |
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| Keywords: | soil lead-zinc mine heavy metals speciation leachate pH value |
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