摘要
利用野外采样与实验室分析相结合的方法,以湘中某冶炼区稻田土壤(0—20 cm)为研究对象,分析其中的Cd、Zn及Pb含量,评价其重金属污染程度与潜在生态风险.单因子污染评价结果表明,100%的土壤样点Cd处于重度污染;有96.0%的样点Zn处于重度污染,有99.5%的样点Pb处于重度污染,土壤的重金属污染程度为Cd>Pb>Zn.潜在生态风险评估结果显示,大多数样点Zn处于轻度生态风险;Pb每个生态风险级别的样点都有,其中处于强生态风险样点居多;100%的样点Cd处于极强生态风险水平.综合潜在生态风险表明,11.0%样点综合潜在生态风险达到很强水平,89.0%样点综合潜在生态风险处于极强水平.上述各项指标综合表明,湘中某冶炼区农田土壤受到了严重的重金属污染.
The concentrations of Cd, Zn and Pb in the topsoil of paddy fields in a smelting area located in the central Hunan province were analyzed by field degrees and potential ecological risks of sampling and laboratory analysis, aiming to evaluate the pollution soil heavy metals. The assessment results from Single Factor Pollution Index showed that 100%, 96.0%, 99.5% of the sampling sites were at the serious pollution level for Cd, Zn, and Pb, respectively, and the pollution degree of heavy metals followed the order of Cd 〉 Pb 〉 Zn in the paddy soils. The assessment results from Potential Ecological Risk showed that most of the sampling sites were at light ecological risk level for Zn, and all the sampling sites were at extremely high ecological risk level for Cd. There were different ecological risk levels for Pb in the sampling sites, but most of them belonged to high ecological risk level. Integrated Potential Ecological Risk Index of the three heavy metals revealed that 11.0% of the sample sites were at very high level, while 89.0% were at extremely high level. All the results indicated that the paddy soils in this smelting area were polluted seriously by heavy metals.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第1期132-138,共7页
Environmental Chemistry
基金
环保部公益项目"重金属污染耕地农业利用风险控制技术研究"(201009047)
湖南省环境科学重点学科建设项目资助
关键词
水稻土
重金属
污染程度
潜在生态风险
评价
paddy soils, heavy metals, pollution degree, potential ecological risk, assessment.
