农业环境科学学报2016，Vol.35Issue(8)：1523-1531,9.DOI:10.11654/jaes.2016-0492
某多金属矿周围牧区土壤重金属形态及环境风险评测
Speciation distribution characteristics of heavy metals in soil of multi-metal mining pastoral area and pollution assessment
摘要
Abstract
Mining and tailings may bring impacts on surrounding environment, one of which is heavy metal pollution. The analysis of heavy metal speciation and distribution can provide scientific basis for control, management and remediation of soil pollutants. The total and ex-tractable contents of heavy metals(Cr, Cu, Ni, Pb, Sr, Zn)in soil samples collected around a multi-metal mining area were measured and the degree of heavy metal pollution was evaluated with pollution load index(PLI), Nemerow index method and risk assessment code(RAC) in this research. The results showed that the total contents of most measured heavy metals were higher than the background values of soil. The PLI results indicated that the soil around the mining area was in the middle pollution level and the degree order of heavy metal pollution was Zn>Cu>Ni>Cr>Pb>Sr. Furthermore, the occurrence state of measured heavy metals showed that the main chemical speciation was resid-ual fraction in these soil samples. The exchangeable fraction(4.99%~42.11%)and carbonate fraction(4.05%~41.10%)of Sr were the highest, while the organic fractions for Cu and Ni were obviously higher than that of other elements. The RAC results indicated that Sr <br> was in high ecological risk; Cu, Ni, Pb and Zn were in a substantially low risk, while Cr showed no risk. Cluster analysis(CA)showed that the non-residual fractions for measured heavy metals in soil samples could be revealed as two clusters:Ni , Pb, Cu and Cr, Sr and Zn. Sr and Zn in the measured heavy metals were the most risk elements to environmental pollution. The above results suggested that this region has been contaminated to varied extents, and there exists further pollution risk. So, the management and supervision of multi-metal mining and tailing in this region should be strengthened.关键词
土壤/重金属/赋存形态/污染负荷指数法(PLI)/内梅罗综合指数法/风险评估编码法(RAC)/聚类分析Key words
soil/heavy metal/speciation/pollution load index(PLI)/nemerow index method/risk assessment coding method(RAC)/cluster analysis(CA)分类
资源环境引用本文复制引用
罗浪,刘明学,董发勤,向莎,张格格,宗美荣,杨刚,张倩,张伟..某多金属矿周围牧区土壤重金属形态及环境风险评测[J].农业环境科学学报,2016,35(8):1523-1531,9.基金项目
国家973项目（2014CB846003）；国家自然科学基金项目 （）
