城市表层土壤重金属污染分析

Analysis of Heavy Metal Pollution of Urban Topsoil

分析了城市表层土壤重金属的污染状况。采用线性三角网法插值,利用MATLAB绘制出重金属元素的空间分布图;运用单项污染指数评价法和综合污染指数评价法给出5个功能区的污染程度排序;通过相关系数分析和系统聚类分析将8种重金属元素归类,结合各功能区的污染状况分析污染原因;建立静态高斯扩散模型,采用最小二乘法,通过1stOpt软件拟合求得3种主要重金属的污染源位置,并建立局部搜索模型加以印证。

This paper analyses the heavy metal pollution situation of urban topsoil by using MATLAB to draw the spatial distribution of heavy metals and adopting linear triangular network interpolation. It proposes a pol- lution sort of five function areas by using Single Pollution pndex Evaluation Method and Integrated Pollution Index Evaluation Method. Eight kinds of heavy metal elements are classified by correlation analysis and hier- archical cluster analysis. Pollution causes are analyzed in association with each function area. Three main pol- lution sources have been identified by establishing a static Gaussian diffusion model, using least squares method and 1st Opt software and a local search model is set up to prove it.