区间数排序法在土壤重金属生态风险分析中的应用

将土壤重金属含量以区间形式表示,并引入区间数排序法,建立了一种基于区间数排序法的土壤重金属生态风险分析模型,并对土壤重金属进行生态风险分析.结果表明,7种重金属的区间排序向量排序为PbCdAsZnCuCrNi,重金属Pb、Cd、As和Zn的生态风险较大.此分析结果符合当地的实际情况,同时与地积累指数法的结果相符,说明区间数排序法在土壤重金属生态风险分析的应用是合理的,其分析结果具有可靠性,也为土壤重金属的风险管理提供理论依据.

Ecological Risk Analysis of Heavy Metals in Soil Based on Ranking-Method of Interval Numbers

The model for ecological risk analysis of heavy metals in soil was established and applied to the risk assessment of heavy metals in the farmland soil,in which the concentrations of heavy metals was expressed as interval numbers,the ranking-method of interval numbers was introduced.The results shown that the order of the risk for the seven kinds of different heavy metals in the sampling sites was Pb＞Cd＞As＞Zn＞Cu＞Cr＞Ni,the ecological risk of heavy metal of such as Pb,Cd,As and Zn was bigger than others.The evaluation results were in line with local conditions,which was consistent with the geoaccumulation index.In the same time,it presented that the method used in the evaluation of soil heavy metal ecological risk was reasonable,and the evaluation results were reliable,thus the ranking-method of interval numbers is more suitable for the risk management of heavy metals in soil.