内梅罗指数法和模糊综合评价法在土壤重金属污染评价应用中的差异分析

现有土壤重金属污染评价方法较多,应用比较广泛的为内梅罗指数法和模糊综合评价法,为分析这2种方法存在的优势和局限之处,将其分别应用于贵溪冶炼厂和无锡市2个实例评价中,比较2种方法评价的差异并分析其原因。结果表明,不同评价方法的评价结果受到区域尺度和污染程度的影响。当研究区域污染严重且区域尺度较小时,内梅罗指数法的评价结果较为准确;当研究区域污染较轻且区域尺度较小时,模糊综合评价法的评价结果较为准确;而当研究区域污染较轻且区域较大时,2种方法评价结果基本无差别。

Differences of Nemerow Index Method and Fuzzy Comprehensive Evaluation Method in Evaluation Heavy Metal Pollution in Soil

There are many heavy metal evaluation methods. Nemerow index method and fuzzy comprehensive evaluation method are used widely. Comparing these two methods in evaluating a smelting plant in Guixi and two other cases in Wuxi, for the purpose of analyzing the advantages and limitations of the methods, results showed that the evaluation was influenced by the regional scale and the degree of pollution. Nemerow index method is relatively accurate in small regional scale with seriously pollution, while fuzzy comprehensive evaluation method is more accurate in small regional scale with slight pollution. When the evaluation is in large regional scale with slight pollution, there is no difference between the two methods.