| 不同来源重金属污染土壤中重金属的释放行为 |
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| 引用本文： | 王丽平,章明奎.不同来源重金属污染土壤中重金属的释放行为[J].环境科学研究,2007,20(4):134-138. |
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| 作者姓名： | 王丽平 章明奎 |
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| 作者单位： | 浙江大学 环境与资源学院资源科学系,浙江 杭州 310029 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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浙江省自然科学基金 |
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| 摘 要： | 根据重金属来源的不同把重金属污染土壤分为2类:外源重金属污染土壤和内源重金属污染土壤，后者重金属来自成土母质.2类污染土壤中的重金属在不同颗粒中的分布有很大差异:外源重金属污染土壤的重金属主要分布于细颗粒中，重金属具有明显的向细颗粒富集的特点；而内源重金属污染土壤的重金属颗粒分异特征相对不明显.提取试验表明，内源重金属污染土壤中重金属主要以残余态形式存在，较为稳定，释放较缓慢，内源重金属污染土壤颗粒磨细程度对土壤重金属释放的影响明显高于外源重金属污染土壤.pH对外源和内源重金属污染土壤中重金属的溶出均有较大影响.连续淋溶试验表明，外源重金属污染土壤释放重金属的强度虽然较高，但其释放持续时间较短；而内源重金属污染土壤释放重金属的强度较低，但其持续时间较长.
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| 关 键 词： | 重金属 释放 外源 内源 |
| 文章编号： | 1001-6929（2007）04-0134-05 |
| 收稿时间： | 2006/11/6 0:00:00 |
| 修稿时间： | 2006-11-062006-12-25 |
Release Behaviors of Heavy Metals from Polluted Soils with Heavy Metals of Different Sources |
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| WANG Li-ping and ZHANG Ming-kui.Release Behaviors of Heavy Metals from Polluted Soils with Heavy Metals of Different Sources[J].Research of Environmental Sciences,2007,20(4):134-138. |
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| Authors: | WANG Li-ping and ZHANG Ming-kui |
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| Affiliation: | Department of Natural Resource Science, College of Natural Resource and Environmental Sciences, Zhejiang University, Hangzhou 310029, China |
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| Abstract: | The soils contaminated with heavy metals could be classified into two groups: interior source heavy metal-polluted soils and exterior source heavy metal-polluted soils. Heavy metals in interior source-polluted soils were inherited from parent materials of the soils. The results showed that there were very different distribution patterns of heavy metals in various sizes of particles between these two groups of soils. Heavy metals in the exterior source-polluted soils were significantly enriched in fine particles, whereas the enrichment was small for the interior source-polluted soils. The heavy metals in interior source-polluted soils were mainly presented in residual form that was stable in normal conditions. The releases of the heavy metals in the interior source-polluted soils were much slower than those of exterior source-polluted soils. The increased release of heavy metals with decreasing size of ground soils were more significant inthe interior source-polluted soils than the exterior source-polluted soils.pH had great influence on release of heavy metals from both groups of the soils. Sequential leaching experiments indicated that release intensity of heavy metals was higher in the exterior source-polluted soils than the interior source-polluted soils. However, the release intensity declined more rapidly in the exterior source-polluted soils than the interior source-polluted soils. |
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| Keywords: | heavy metals release exterior source interior source |
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