金昌城市居民区土壤重金属分布特征研究  

The characteristics of heavy metal pollution in the residential area soil of Jinchang city

作　　者：胡小娜[1] 南忠仁[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,兰州730000

出　　处：《干旱区资源与环境》2011年第1期180-184,共5页Journal of Arid Land Resources and Environment

基　　金：自然科学基金(NSFC40671167);国家环境保护公益性项目(NEPCP200809098);973项目(2008CB417212)资助

摘　　要：通过对甘肃省金昌市居民区土壤重金属含量的调查分析,以国家土壤环境质量标准和区域土壤背景值为评价标准,利用单项和综合污染指数对金昌市居民区土壤重金属进行分析评价。结果表明:金昌市居民区五种重金属元素的平均含量均超过该地区的背景值,90%以上研究区域的土壤重金属含量超过区域背景值,金昌市不同居民区土壤的重金属含量差异很大,土壤重金属含量的变异系数28.60-105.03%,变异系数相比较:Ni>Cu>Cd>Pb>Zn。对重金属含量进行相关性分析,Cu与Ni、Cd、Pb、Zn都达到显著性水平,Ni与Cu、Cd达到性显著水平。单项污染指数比较,污染程度是Cu>Ni>Cd>Zn>Pb,就平均值来看,Cu、Ni为轻度污染,Zn、Cd、Pb为非污染。综合污染指数最小值为0.82,最大值达到1.14,65%的研究区域为轻度污染。居民区土壤中重金属主要来源于该地区的矿业开采和金属冶炼等工业活动。Soil samples collected from residential areas in Jinchang city were analyzed for the concentrations of five heavy metals,and pollution assessments were conducted by using single pollution indices and integrated pollution indices,according to the criteria of National Standard for Soil Environmental Quality and background values in studied areas,respectively. Our findings showed that the concentrations of all five heavy metals exceeded their background levels,tne concentrations of heavy metals in 90% studied areas was bigger than the background values of heavy metals in the region . Concentrations of heavy metals varied with soil samples from different residential areas,and the variance coefficients of heavy metals concentrations ranged from 28. 60% to 105. 03% with an order of Ni Cu Cd Pb Zn. The results of correlation analysis showed that Cu had significant linear relationships with Ni,Cd,Pb and Zn,as well as Ni with Cu and Cd. The single pollution indices were in an order of Cu Ni Cd Zn Pb. Cu and Ni had already posed lightpollution,Zn ,Cd and Pb posed no pollution, respectively,according to their average values of concentrations. The minimum and maximum values of integrated pollution indices of studied areas were 0. 82 and 4. 14 respectively,65% of the studied areas were of light pollution. The main sources of heavy metals in soil of residential areas were the smelting industries and mining activities in the city.

关 键 词：土壤 重金属 污染 评价 

分 类 号：X53[环境科学与工程—环境工程]