平原地区多期次高龄生活垃圾填埋场重金属污染  

Study on heavy metal pollution of multi-stage aged domestic waste landfill in plain area

作　　者：金志鹏[1] 祁超[1] 丁祉潮 翁智灏 Jin Zhipeng;Qi Chao;Ding Zhichao;Weng Zhihao(Geological Exploration Technology Institute of Jiangsu Province,Nanjing 210049,Jiangsu,China)

机构地区：[1]江苏省地质勘查技术院,江苏南京210049

出　　处：《地质学刊》2024年第1期92-99,共8页Journal of Geology

基　　金：江苏省地质矿产勘查科研项目“土壤及地下水污染调查综合勘查技术研究”(苏地矿发[2019]102号:2019KY11)。

摘　　要：通过对江苏某市郊生活垃圾填埋场及周边耕地中Cu、Zn、Ni、Cd、Pb、Hg、As、Cr 8种重金属元素含量进行调查分析,研究重金属元素在土壤中的分布特征,采用内梅罗指数法与潜在生态危害指数法对土壤重金属污染风险进行评价。结果表明:填埋场表层土壤中Cu、Zn、Ni、Cd、Pb、Cr含量均高于所在区域背景值,Hg、As含量低于区域背景值,重金属元素总体变异程度高,受人类活动影响显著;生活垃圾填埋场内部表层土壤污染较填埋场深部及周边严重,填埋场内外部重金属污染存在较强的关联性。两种方法的评价结果均表明,Cd、Cu和Hg在填埋场表深层、内外部一致性好,污染风险高,应予重点关注。两种方法对Hg、Zn的生态风险评价结果相差较大,可能与重金属毒性赋值相关。Based on investigation of eight heavy metal elements including Cu,Zn,Ni,Cd,Pb,Hg,As,and Cr in a waste landfill and its surrounding farmland in the suburbs of a certain city in Jiangsu Province,the distribution characteristics of those heavy metal elements in soil have been studied,and heavy metal pollution risk of soil has been evaluated by Nemerow index method and potential ecological risk index method.Contents of Cu,Zn,Ni,Cd,Pb and Cr in the surface soil of the landfill site are higher than the local background values,while contents of Hg and As are relatively low.The overall variability of heavy metal elements is high,and contents are significantly affected by human activities.Pollution of surface soil inside the landfill site is severer than that of deep soil inside the landfill site and its surrounding area.There is an obvious correlation of heavy metal pollution between inside and outside the landfill site.Evaluation results of both methods indicate that Cd,Cu,and Hg have good consistency in the surface and deep layer,and the internal and external landfill site,and have a high pollution risk,which should be paid special attention to.There is a significant difference in the ecological risk assessment results of Hg and Zn with both methods,which may be related to the assignment of heavy metal toxicity.

关 键 词：垃圾填埋场 重金属 污染评价 多期次 

分 类 号：P595[天文地球—地球化学] X825[天文地球—地质学]