何家小岭尾矿库周边土壤重金属污染状况分析及潜在风险评价  

Pollution Status Analysis and Potential Risk Assessment of Heavy Metals in Soils Around the Tailing of Hejiaxiaoling

作　　者：刘盛萍[1,2] 笪春年 岳梅[1,2] 叶劲松[1,2] LIU Shengping;DA Chunnian;YUE Mei;YE Jinsong(School of Biology,Food and Environment,Hefei University,Hefei 230601,China;Collaborative Innovation Center for Environmental Pollution Precaution and Ecological Rehabilitation of Anhui,Hefei 230601,China)

机构地区：[1]合肥学院生物食品与环境学院,安徽合肥230601 [2]安徽省环境污染防治与生态修复协同创新中心,安徽合肥230601

出　　处：《安庆师范大学学报（自然科学版）》2020年第3期84-89,共6页Journal of Anqing Normal University(Natural Science Edition)

基　　金：国家自然基金后续研究项目(1800070928);合肥学院院级重大项目(16ZR04ZDA);安徽省高校优秀青年骨干人才国内访问研修项目(gxgnfx2018032)。

摘　　要：对合肥市庐江矿区何家小岭尾矿库周边土壤中重金属的总量和形态分布进行分析,通过内梅罗指数法和风险评价编码法(RAC)对其污染状况进行评价。结果表明,除Ni外,其他重金属元素均高于庐江县土壤背景值,其中Cu、Cd两种元素超过风险筛选值(GB15618-2018)。土壤中金属元素(除Cd以外)主要以残渣态为主,Cd元素的弱酸提取态占相当大的比例(11.25%~52.18%),金属元素弱酸提取态顺序由大到小依次为Cd、Zn、Ni、Cu、Pb、As、Cr。基于单因子和内梅罗污染的结果表明,Cu、Cd、As属于轻微污染,土壤重金属总体水平属于轻度污染,基于形态的RAC表明该地区Cd为高风险,Zn为中风险,其他元素无风险或具有较低的风险水平。The total amount and speciation distribution of heavy metals in the soils around the Tailing of Hejiaxiaoling,Lujiang,Hefei City were determined to evaluate the level of contamination by Nemerow index and risk assessment code(RAC).The results showed that the contents of heavy metals(except of Ni)were higher than the background values of Lujiang soils,the contents of Cu and Cd were beyond the risk screening value(GB15618-2018).The metal elements(except Cd)in the soil are mainly in the residue state,and the weak acids soluble fraction of Cd accounts for a considerable proportion(11.25%~52.18%).The extraction of weak acids soluble fraction became weaker in the order Cd,Zn,Ni,Cu,Pb,As,Cr.Single factor and Nemerow index indicated that Cu、Cd、As were minor pollution,in this area heavy metals were light pollution,and the overall level of heavy metocls in the soil was slightly polluted.RAC showed that Cd was a high risk and Zn was a medium risk,while other heavy metals were no or risk or have a low risk level.

关 键 词：尾矿库 土壤 重金属 形态 风险评价编码(RAC) 

分 类 号：X53[环境科学与工程—环境工程]