A comparative analysis of environmental quality assessment methods for heavy metal-contaminated soils
A comparative analysis of environmental quality assessment methods for heavy metal-contaminated soils
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DOI：
10.1016/s1002-0160(08)60024-7
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发表时间：
2008-06-01
期刊：
影响因子：
5.7
通讯作者：
Cheng Shu-Pei
中科院分区：
文献类型：
--
作者：
Li Wei-Xin;Zhang Xu-Xiang;Cheng Shu-Pei
采用2个污染指数和2个模糊数学模型4种评价方法，对南京市某铁合金厂周围4种土壤的环境质量进行了调查。用单因素指数法评价土壤环境质量为IV类(中度污染)，用综合指数模型评价A、B、C、D土壤分别为IV、III、III、III类。与单因素指数法相比，综合指数模型既考虑了各因素对综合环境质量的主导参数，又考虑了各因素对综合环境质量的平均贡献。利用两种模糊数学方法(单因素决策模型和加权平均模型)，确定了土壤A、B、C和D的环境风险分别为IV、III、II(清洁)和II类。但两种方法对各污染类别的隶属度仍存在差异。在模糊数学方法中，用隶属度函数来描述不同污染程度之间的界限，并根据污染贡献度为各因素分配不同的权重。在模糊数学模型中引入各因素的隶属度和权重，使该方法在环境风险评价领域更加合理。
Four assessment methods (two pollution indexes and two fuzzy mathematical models) were employed to investigate the environmental quality of four soils around a ferroalloy plant in Nanjing City. Environmental quality was assessed as class IV (moderately polluted) for each soil with single-factor index method, and was identified to be classes IV, III (slightly polluted), III, and III for soils A, B, C, and D, respectively, with the comprehensive index model. In comparison with the single-factor index method, the comprehensive index model concerned both dominant parameter and average contribution of all factors to the integrated environmental quality. Using the two fuzzy mathematical methods (single-factor deciding and weighted average models), the environmental risks were determined to be classes IV, III, II (clean), and II for soils A, B, C, and D, respectively. However, divergence of the membership degree to each pollution class still occurred between the two methods. In fuzzy mathematical methods, membership functions were used to describe the limits between different pollution degrees, and different weights were allocated for the factors according to pollution contribution. Introduction of membership degree and weight of each factor to fuzzy mathematical models made the methods more reasonable in the field of environmental risk assessment.