| 摘要: |
| 污染土壤风险控制值对污染场地的修复至关重要；针对实际修复中风险控制值的计算常忽略浅层和深层土壤存在差异，提出了以层次化健康风险评估方法计算污染场地的风险控制值；通过监测重庆某机械加工企业遗留场地不同深度土层特征参数和重金属的含量，对场地土壤进行层次化健康风险评估；结果表明：场地部分土壤样品中的Cd和Hg的健康风险超过可接受水平，重金属Cd、Hg和Zn在地下0~4.3 m的风险控制值分别为7.23 mg〖KG-*2〗·〖KG-*4〗kg-1、4.61 mg〖KG-*2〗·〖KG-*4〗kg-1和4 070 mg〖KG-*2〗·〖KG-*4〗kg-1，在地下4.3~8 m的风险控制值分别为20.96 mg〖KG-*2〗·〖KG-*4〗kg-1、9.89 mg〖KG-*2〗·〖KG-*4〗kg-1和21 500 mg〖KG-*2〗·〖KG-*4〗kg-1，相比单一风险控制值，采用层次化风险控制值可以有效降低污染土壤的修复方量。 |
| 关键词: 污染场地；重金属；层次化方法 风险控制值 |
| DOI： |
| 分类号: |
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| Application of Tiered Health Risk Assessment to Heavy Metals Contaminated Site |
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WANG Jia1, LI Yu jie1*, CHEN Jing2, HE Shu jian2, HUANG Yan qiu2, LI Wen lin3, MENG Xi4
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| Abstract: |
| The risk control values of soil are crucial to remediation of contaminated sites. Based on that the calculation of risk control value often ignore the differences between surface and deep soil, the tiered health risk assessment approach is performed to evaluate the risk control values of soil. The heavy metals in soil and site characteristic parameters of a mechanical processing factory in Chongqing are investigated, the tiered health risk assessment approach was displayed for this contaminated site. The results showed that the health risk of Cd and Hg in some soil samples were unacceptable. The risk control values of Cd, Hg and Zn were 7.23 mg.kg-1, 4.61 mg.kg-1 and 4070 mg.kg-1 for 0 m to 4.3m under the ground, respectively while they were 20.96 mg.kg-1, 9.89 mg.kg-1 and 21500 mg.kg-1 for 4.3m to 8m under the ground, respectively. Compared with the single risk control values, the risk control values of tiered health risk assessment approach can effectively reduce the amount of polluted soil for remediation. |
| Key words: contaminated site heavy metals tiered approach, risk control values |
