地积累指数法在土壤重金属污染评价中的应用.doc

地积累指数法在土壤重金属污染评价中的 应用 摘要: 应用地积累指数对广州5 个郊区的土壤重金属污染情况进行了评价研究. 从广东省土壤重金属背景值计算 的地积累指数结果来看,广州郊区土壤中Hg 和Cd 都达到中度污染,Zn 为轻度- 中度污染,Pb ,As ,Cu ,Cr ,Ni 都不存在污染. 从8 种元素的分级频率来看, Hg 的污染频率最大,达到89. 8 %;其次是Cd 和Zn ,分别是78. 2 %和54. 6 %;其余5 种元素污染频率的大小顺序为Pb ,As ,Cu ,Cr ,Ni ;Hg 出现了5. 9 %的极严重污染. 广州5 个郊区的污染元素和元素的污染程度存在着明显的差别,Q 型聚类分析将海珠区、芳村区、天河区和黄埔区聚为一类,为较高程度污染区;而把白云区单列一类,为低污染区;同时,整个广州的污染情况与白云区聚为同一类. 关键词: 土壤重金属; 污染评价; 地积累指数; 广州 中图分类号: X 53 　　　　　　文献标识码: A 　　　　　　文章编号: 0253 - 374X(2006) 12 - 1657 - 05 Application of Index of Geoaccumulation ( Igeo) to Pollution Evaluation of Heavy Metals in Soil CHA I S hiwei1 ,2 , W EN Yanmao2 , ZHA N G Yalei1 , ZHA O Jianf u3 (1. State Key Laboratory of Pollution Control and Resources Reuse ,Tongji University ,Shanghai 200092 ,China ; 2. School of Environmental Science and Engineering ,Zhongshan University ,Guangzhou 510275 ,China ; 3. Key Laboratory of Yangtze River Water Environment of the Ministry of Education ,Tongji University ,Shanghai 200092 ,China) Abstract : Pollution of heavy metals in soil in Guangzhou suburbs is evaluated on the basis of the index of geoaccumulation. The result s show that the pollution of Hg and Cd in the soil of the suburbs of Guangzhou City is classified as moderate degree , and that of Zn as between slight and moderate de2 grees , and five other metals of no pollution according to the result s of Igeo based on the background val2 ue of heavy metals in the soil of Guangdong Province. The pollution f requency of Hg is 89. 8 % , the highest among the 8 metals , and those of Cd and Zn are 78. 2 % and 54. 6 % respectively , next to the highest , and the pollution degree of the other five metals can be put in this order :Pb ,As ,Cu ,Cr ,Ni ,of which Pb is the highest and Ni is the lowest . Hg causes very serious pollution ,for it reaches 5. 9 %. There are quite different polluting metals and polluting degrees in the 5 suburbs of Guangzhou City. Haizhu , Fangcun , Tianhe and Huangpu are grouped into the same degree , which are the