金昌市城区土壤重金属空间分布及潜在生态危害评价  

Spatial Distributions of Heavy Metals and Assessment of Potential Ecological Risk in Jinchang Urban Area

作　　者：黄璜[1] 南忠仁[1] 胡小娜[1] 刘晓文[1] 李媛[1] 丁海霞[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室资源环境学院,甘肃兰州730000

出　　处：《环境监测管理与技术》2009年第5期30-34,共5页The Administration and Technique of Environmental Monitoring

基　　金：国家自然科学基金资助项目(NSFC40671167);国家环境保护公益性基金资助项目(NEPCP200809098);"九七三"基金资助项目(2008CB417212)

摘　　要：通过对金昌市区范围内74处土壤的取样研究分析,结果表明:Cd、Cu、Ni、Pb、Zn5种重金属平均含量均超过当地土壤背景值,其中以Cu和Ni最为显著,其平均含量分别达到430 mg/kg和361 mg/kg;5种重金属变异系数均较大,其中Cu和Ni变异系数达到了115%和123%,属强变异性;采用克立格最优内插法得到金昌市表层土壤重金属含量的空间分布图,发现Cu和Ni呈局部污染态势,矿业开采和金属冶炼加工等工业活动是Cu和Ni最大的污染源;Pb、Zn和Cd在整个研究区域内都有积累,工矿活动和交通运输是金昌市Pb、Zn和Cd的共同污染源。潜在生态危害评价结果表明,该地区重金属污染已构成中度生态危害。The 74 soil samples were analyzed from Jinchang urban area. The results showed that the average concentrations of Cd, Cu, Ni, Pb, Zn were more than the local background levels, especially Cu 430mg/kg and Ni 361mg/kg. The variation of coefficients of the five elements were all in high levels, and Cu 11.5% and Ni 12.3% , to show strong variability. Sketch-maps of spatial distributions of the five heavy metals were obtained by Kriging interpolation to indicate that mining and smelting had caused local pollution of Cu and Ni. The elements of Pb, Zn and Cd were obviously accumulated in the whole urban area. The industrial activities and trans-portation had brought about; intermediate ecological risk of heavy metal pollution.

关 键 词：金昌市 重金属 克立格插值 潜在生态危害评价 土壤 

分 类 号：X825[环境科学与工程—环境工程]