Heavy metal(loid)s(HMs)pollution has become a common and complex problem in industrial parks due to rapid industrialization and urbanization.Here,soil and groundwater were sampled from a retired industrial park to inv...Heavy metal(loid)s(HMs)pollution has become a common and complex problem in industrial parks due to rapid industrialization and urbanization.Here,soil and groundwater were sampled from a retired industrial park to investigate the pollution characteristics of HMs.Results show that Ni,Pb,Cr,Zn,Cd,and Cu were the typical HMs in the soil.Source analysis with the positive matrix factorization model indicates that HMs in the topsoil stemmed from industrial activities,traffic emission,and natural source,and the groundwater HMs originated from industrial activities,groundwater-soil interaction,groundwater-rock interaction,and atmosphere deposition.The sequential extraction of soil HMs reveals that As and Hg were mainly distributed in the residue fraction,while Ni,Pb,Cr,Zn,Cd,and Cu mainly existed in the mobile fraction.Most HMs either in the total concentration or in the bioavailable fraction preferred to retain in soil as indicated by their high soil-water partitioning coefficients(K_(d)),and the K_(d) values were correlated with soil pH,groundwater redox potential,and dissolved oxygen.The relative stable soil-groundwater circumstance and the low active fraction contents limited the vertical migration of soil HMs and their release to groundwater.These findings increase our knowledge about HMs pollution characteristics of traditional industrial parks and provide a protocol for HMs pollution scrutinizing in large zones.展开更多
为了解长江下游某化工园区公共区域表层土壤中的重金属分布特征、污染现状及污染来源,在某化工园区公共区域共采集了514个表层土壤样品,检测了11种元素浓度.基于GIS(Geographic Information Systems)进行重金属浓度分布平面表征,采用单...为了解长江下游某化工园区公共区域表层土壤中的重金属分布特征、污染现状及污染来源,在某化工园区公共区域共采集了514个表层土壤样品,检测了11种元素浓度.基于GIS(Geographic Information Systems)进行重金属浓度分布平面表征,采用单因子指数、潜在生态风险指数、主成分分析(principal component analysis,PCA)和绝对主成分得分多元线性回归受体模型(absolute principal component score multiple linear regression receptor model,APCS-MLR)进行了研究分析.研究结果表明:化工园区公共区域表层土壤中除Cr(Ⅵ)低于检出限外,其他10种重金属均有检出,且均存在超背景值区域,占比分别为Cu(86%)>Cd(71%)>Co(53%)>Ni(50%)>Be(45%)>As(42%)>Sb(40%)>Pb(23%)>V(16%)>Hg(4%),主要位于火力发电厂和垃圾焚烧厂周边.研究区域表层土壤中Cd元素和Sb元素的生态风险指数较高,且均存在极强(Cd占比1.7%、Sb占比1.5%)和很强(Cd占比1.0%、Sb占比0.2%)生态风险等级的区域,均位于园区西北侧大型化工企业附近.表层土壤中重金属复合生态风险指数属于中等生态危害,存在着一定的生态危害风险.研究区域表层土壤中的重金属污染来源主要包括化工源和燃烧源、自然源、交通源,载荷量分别为27.2%、17.0%、11.0%.展开更多
基金supported by the Science and Technology Research Program of Zhejiang Province(No.2020C03011)the National Key Research and Development Program of China(No.2022YFC3702100)Zhejiang Provincial Natural Science Foundation of China(No.LD21B070001)。
文摘Heavy metal(loid)s(HMs)pollution has become a common and complex problem in industrial parks due to rapid industrialization and urbanization.Here,soil and groundwater were sampled from a retired industrial park to investigate the pollution characteristics of HMs.Results show that Ni,Pb,Cr,Zn,Cd,and Cu were the typical HMs in the soil.Source analysis with the positive matrix factorization model indicates that HMs in the topsoil stemmed from industrial activities,traffic emission,and natural source,and the groundwater HMs originated from industrial activities,groundwater-soil interaction,groundwater-rock interaction,and atmosphere deposition.The sequential extraction of soil HMs reveals that As and Hg were mainly distributed in the residue fraction,while Ni,Pb,Cr,Zn,Cd,and Cu mainly existed in the mobile fraction.Most HMs either in the total concentration or in the bioavailable fraction preferred to retain in soil as indicated by their high soil-water partitioning coefficients(K_(d)),and the K_(d) values were correlated with soil pH,groundwater redox potential,and dissolved oxygen.The relative stable soil-groundwater circumstance and the low active fraction contents limited the vertical migration of soil HMs and their release to groundwater.These findings increase our knowledge about HMs pollution characteristics of traditional industrial parks and provide a protocol for HMs pollution scrutinizing in large zones.
文摘为了解长江下游某化工园区公共区域表层土壤中的重金属分布特征、污染现状及污染来源,在某化工园区公共区域共采集了514个表层土壤样品,检测了11种元素浓度.基于GIS(Geographic Information Systems)进行重金属浓度分布平面表征,采用单因子指数、潜在生态风险指数、主成分分析(principal component analysis,PCA)和绝对主成分得分多元线性回归受体模型(absolute principal component score multiple linear regression receptor model,APCS-MLR)进行了研究分析.研究结果表明:化工园区公共区域表层土壤中除Cr(Ⅵ)低于检出限外,其他10种重金属均有检出,且均存在超背景值区域,占比分别为Cu(86%)>Cd(71%)>Co(53%)>Ni(50%)>Be(45%)>As(42%)>Sb(40%)>Pb(23%)>V(16%)>Hg(4%),主要位于火力发电厂和垃圾焚烧厂周边.研究区域表层土壤中Cd元素和Sb元素的生态风险指数较高,且均存在极强(Cd占比1.7%、Sb占比1.5%)和很强(Cd占比1.0%、Sb占比0.2%)生态风险等级的区域,均位于园区西北侧大型化工企业附近.表层土壤中重金属复合生态风险指数属于中等生态危害,存在着一定的生态危害风险.研究区域表层土壤中的重金属污染来源主要包括化工源和燃烧源、自然源、交通源,载荷量分别为27.2%、17.0%、11.0%.