西安市城墙内公园土壤重金属含量水平及污染评价  

Concentration Determination and Contamination Evaluation for Heavy Metals in Soil of Three Parks inside Wall of Xi'an City

作　　者：孙先锋[1] 徐甜甜[1] 王敏[2] 刘舒[1] 沈旭丰[1] 

机构地区：[1]西安工程大学环境与化学工程学院,西安710048 [2]武汉纺织大学纺织印染清洁生产教育部工程研究中心,武汉430073

出　　处：《城市环境与城市生态》2011年第3期1-4,共4页Urban Environment & Urban Ecology

基　　金：陕西省教育厅专项科研计划项目(09JK458)

摘　　要：以西安市城墙以内3个公园的表层土壤为研究对象,分析测定了其基本理化性质和其中代表性重金属Cu、Ni及Zn的总量与不同形态的含量,并分别采用单项污染指数法和内梅罗污染指数法对各公园土壤重金属污染进行了评价。结果显示:西安市城墙以内3个公园的表层土壤均呈碱性并含有较多有机质;3个公园表层土壤中Cu、Ni及Zn的平均含量分别为36.96 mg/kg、24.32 mg/kg及106.50 mg/kg;Cu、Ni及Zn元素的形态分布均以残渣态为主,3种元素的有效态含量所占百分比顺序依次是Cu>Zn>Ni;3个公园Ni元素的单项污染指数平均值均小于1,说明这3个公园土壤未受到Ni元素的污染。3个公园整体内梅罗污染指数为2.47,说明这3个公园土壤中重金属污染已经达到中度污染,且Cu元素污染程度最严重。The concentration and the chemical speciation of Cu,Ni and Zn,as heavy metals＇ representives,were analyzed for the surface soil samples taken from the three parks inside the Wall of Xi＇an City,and the heavy metal pollution level was evaluated by single pollution index and Nemero pollution index.The result showed that the soil appeared alkaline and contained plenty of organic matter,and the average concentrations of Cu,Ni and Zn were 36.96 mg/kg,24.32 mg/kg and 106.50 mg/kg respectively.The chemical speciation of Cu,Ni and Zn mainly existed in residual form,and the content percentages of these heavy metals in the order of CuZnNi.The average single index of Ni in the three parks was less than the others,so the soil was not polluted by Ni.The average Nemero index was 2.47.That showed the soil was moderately polluted by heavy metals.And the soil contaminated by Cu was the most severe.

关 键 词：公园土壤 重金属 污染指数 污染评价 形态分布 西安 

分 类 号：X53[环境科学与工程—环境工程]