摘要:
以网格布点方式采集省内地块较为集中的成片耕地表层土壤样本327个,进行镉、汞、砷、铜、铅、铬、锌、镍8种主要重金属污染物含量的测定。应用单因子污染指数法、内梅罗综合污染指数法及Hacanson潜在生态风险指数法,对耕地土壤污染状况及生态风险进行评价。结果表明,福建省区域内耕地土壤环境质量状况总体良好,属于清洁与尚清洁的区域占全部监测区域的86.7%,但单因子评价结果显示耕地土壤中无机元素汞和镉超标较为严重。生态风险评价结果显示,福建省耕地土壤中有73.1%的土壤处于低风险等级,22.0%的土壤处于中等风险等级,强风险等级土壤占3.98%,很强风险等级土壤仅占0.92%。土壤中各项重金属对土壤潜在生态风险贡献率大小顺序为: Hg>Cd>As>Pb>Cu>Ni>Cr>Zn。
Abstract:
Using the grid sampling methodology, 327 cultivated topsoil samples were collected in Fujian for this study. Contents of eight heavy metals(i.e., Cd, Hg, As, Cu, Pb, Cr, Zn and Ni)were determined. The Single Factor Pollution Index (SFPI), Nemerow Integrated Pollution Index and Hacanson Potential Ecological Risk Index (PERI) were applied for the soil pollution and risk evaluation. The results showed that the quality of the cultivated soils in the province were generally good. Majority of the sampled soils (86.7%) belonged to the clean and relatively clean categories. The SFPI evaluation showed that Hg and Cd contents exceeded the limits. The PERI assessment indicated that, among all soils sampled, 73.1% were at a low risk, 22.0% at medium risk, 3.98% at high risk, and only 0.92% posted a severe risk. The contribution of various heavy metals on pollution was found to be in the order of: Hg>Cd>As>Pb>Cu>Ni>Cr>Zn.
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