收稿日期: 2008-04-12
修回日期: 2008-04-14
网络出版日期: 2008-05-10
基金资助
国家自然科学基金项目“川滇交界地区MVT铅锌矿床二元流体混合成矿机制研究”（编号：40172039）；环境地球化学国家重点实验室基金项目“贱金属矿床矿山环境中酸性水的形成对重金属元素的释放与迁移研究”(编号：SKLEG5010)资助.
Potential Ecological Risk Assessment Model for Heavy Metal Contamination of Agricultural Soils in Mining Areas
Received date: 2008-04-12
Revised date: 2008-04-14
Online published: 2008-05-10
Weeks(2005)提出有关土壤污染的生态风险“层叠式 (Tiered approach)”评价框架，有关各层次的评价技术是当前环境科学研究的热点。针对矿山环境土壤重金属污染生态风险特征，提出矿山环境土壤重金属污染潜在生态风险评价模型，属于Tire 1层次评价模型。根据矿山环境土壤重金属污染生态风险特征，遵循生态风险评价中的熵原理和证据权重原则，用土壤中重金属的浓度风险表征污染指数（Cif）；以其环境生物可利用性表征毒性响应系数（Tib），以对污染指数进行修正；以重金属元素的生物毒性响应因子（Tie）为权重，提出矿山环境土壤重金属污染潜在生态风险评价模型：RI=∑mi=1Eri其中，Eri= Tie×Tib×Cif；RI表示土壤中多种重金属潜在生态风险指数；Eri为元素i的潜在风险因子；Cif=Ci/Cio ，Ci为土壤中重金属浓度实测值，Cio为计算所需要的参照值。Tib=（Rib/ Pib）1/2，Rib为样品中某元素生物可利用相态占总含量的百分比，Pib为参照土壤的相应比值。
李泽琴 , 王奖臻 , 侯佳渝 . 矿山环境土壤重金属污染潜在生态风险评价模型探讨[J]. 地球科学进展, 2008 , 23(5) : 509 -516 . DOI: 10.11867/j.issn.1001-8166.2008.05.0509
The aim of this work was to develop a potential ecological risk index to be used as a diagnostic tool for heavy metal contaminated agricultural soils control purposes in mining areas. Taking consideration that the main-road for ecological risk of heavy metal contamination of soil is soil-vegetation-man. The environmental bioavailability largely determines the environmental impact of metal contaminated soils. Using environmental bioavailability explain the environmental toxicity sensitivity of the heavy metals in the soil-vegetation-man ecological system. The model is following: RI=∑mi=1Eri, with Eri= Tie×Tib×Cif. RI= the requested potential ecological risk index for soil; Eri = the potential ecological risk factor for the given substance (i); Cif= the degree of contamination, Cif=Ci/Cio , Ci= the metal concentration in the soil, Cio= the metal concentration for samples from referring area; Tie= the element toxic-response factor for the given substance: Zn=1, Pb=4, Cd=15, Cu=2, Cr=11, Ni=3. Tib=（Rib / Pib）1/2; Tib=the environment bioavailbability ratio factor, Tib =（Rib / Pib）1/2, Rib =[water soluble fraction + exchangeable fraction/total concentration of the metal in soil](100%] for the samples of contaminated soil, Pib=[water soluble fraction + exchangeable fraction/total concentration of the metal in soil]×100%] for samples from referring area.
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