摘要: |
【目的】为了解陕西省西部某县农产品产地土壤重金属污染状况。【方法】采用单项污染指数法、内梅罗综合污染指数法和Hakanson 潜在生态风险指数法对该区域表层土壤中5种重金属元素进行污染及生态风险评价。【结果/结论】结果表明:Cd、Pb、Hg、As、Cr等 5 种元素的平均值分别为 0.318、29.6、0.138、14.0、68.4 mg.kg<sub><sup>-1</sup></sub>;各元素含量超过背景值的比例为Cd 96.75%、Hg 80.97%、Pb 99.77%、As 76.57%、Cr 51.28%,污染程度由强到弱依次为 Cd>Pb>Hg>As>Cr;研究区域综合潜在生态风险指数为266.1,属中等生态危害程度,其中52.67%土壤样点达到中等生态危害,9.28%土壤样点达到强及以上生态危害,应该引起相关政府部门的高度重视。 |
关键词: 农产品产地土壤 重金属 污染评价 陕西 |
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基金项目:农业部农业生态环境保护重大专项(农科教发〔2012〕3 号) |
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Evaluation of Heavy Metal Pollution in soil of Agricultural Products Producing Areas in Western Shaanxi Province |
liyan
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Shaanxi Farmland quality and Agricultural Environment Protection Work Station
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Abstract: |
[Purpose]To explore the contamination status of heavy metal in agricultural producing area soils in a western county of Shaanxi province。[Method]single factor index method,Nemerow comprehensive pollution index method and potential ecological risk index method were used to assess the pollution degree and ecological risk of five heavy metal elements in the topsoil (0~20cm) in the district. [Result/Conclusion]The results showed that: The average contents of heavy metal Cd , Pb , Hg ,As and Cr in soils were 0.318, 29.6, 0.138, 14.0 and 68.4 mg?kg<sup>-1</sup>,respectively. The percentage of heavy metal elements in soil exceeding the background values of the elements in the study area were as follow respectively:Cd(96.75%), Pb(99.77%), Hg(80.97%), As(76.57%)and Cr(51.28%).The results showed that the pollution rank were Cd>Pb>Hg>As>Cr. The average value of comprehensive potential ecological risk index is 266.1, which belongs to the degree of moderate ecological damage, 52.67% of samples reached moderate ecological harm, and 9.28% of the samples reached strong or above ecological hazards, which should be paid attention by relevant government agencies. |
Key words: agricultural producing area soil heavy metal pollution assessment Shaanxi Province |