基于物元可拓法的土壤重金属污染评价

土壤重金属污染具有典型的模糊性和不确定性。为准确地评估土壤重金属污染情况，利用物元理论、可拓理论和关联函数建立了土壤重金属污染评估的物元可拓模型。在此基础上，选择Cd、Pb、Cr、Hg、Cu和Zn 6个污染因子作为评价指标，对某金矿区46个采样点进行污染评价。结果表明，研究区46个采样点中，清洁级样点有23个，占总采样点的50%，尚清洁级样点11个，占总采样点的23.9%，轻污染级样点11个，占总采样点的23.9%，中污染采样点1个，占总采样点的2.2%。通过与4种传统的经典污染评价方法比较可知，物元可拓法用于土壤重金属污染评价是可行的，运用Matlab2010b进行评价结果计算，操作简便快捷，另外，物元可拓法在评价过程中避免了人为因素的影响，实现了对参评因子的量化处理，是进行土壤重金属污染评价的一种新方法。

Evaluation of Soil Heavy Metal Pollution Based on the Matter-element Extension Method

The soil heavy metal pollution has typical characteristics of fuzziness and uncertainty.In order to accurately evaluate the situation of soil heavy metal pollution，The matter-element extension model for evaluating soil heavy metal pollution was established based on theory of matter-element，extension theory and correlation function.Furthermore，pollutions from 46 sampling points in Goldfield were evaluated by choosing Cd，Pb，Cr，Hg，Cu and Zn as evaluation factors.The results showed that there were 23 sampling points at clean level among the 46 sampling points chosen from Goldfield，accounting for 50% of the total sample points，11 at light clean level，accounting for 23.9% of the total sampling points，and 11 at light pollution level and 1 at middle pollution level，accounting for 23.9% and 2.2% of the total sampling points respectively.Comparing with other four classical methods，it is concluded that using matter-element extension method to evaluate the situation of soil heavy metal pollution is feasible.It is simple and efficient to calculate the evaluation results with Matlab2010b.In addition，matter-element extension method avoided the influence of artificial factors in the process of evaluation and realized the quantitative processing with regard to these factors.Thus，it is a new and ideal method in evaluating heavy metal pollution of soil.