摘要
为了识别江西省乐平市土壤重金属污染来源问题,科学制定土壤重金属源-汇高效诊断技术方案,对 20世纪该地区水系沉积物中重金属Cd、Cr、Pb、Zn、Cu和Ni的污染状况、生态风险和来源情况进行研究,揭示历史时期重金属含量及来源特征.运用地累积指数法、潜在生态风险指数法和潜在生物毒性效应协同评估水系沉积物中重金属的潜在生态风险,采用相关性分析、主成分分析和PMF模型进行源解析.结果表明:① 重金属Cd、Cr、Pb、Zn、Cu和Ni浓度平均值分别为0.15,68.07,25.35,66.84,23.98,25.59 mg/kg;除Zn外,其余元素含量均值均超过中国水系沉积物背景值;除Pb和Zn外,其余元素含量平均值均超过江西省土壤背景值.6种重金属含量高值区分布基本吻合,主要分布在研究区东北部.② 地累积指数和潜在生态风险指数结果均表明Cd和Cu的贡献较大.潜在生物毒性评价结果显示Ni的贡献较大.主成分和PMF模型分析结果具有一致性,结果显示6 种重金属主要来源于自然源,受当地成土母质控制.Cd和Cu是引起环境风险的主要因子,需要加强关注.研究成果可为该地区重金属污染防治、水环境和土壤科学管理提供参考.
Abstract
To identify the source of soil heavy metal pollution in Leping City,Jiangxi Province,and scientifically formulate an ef-ficient diagnostic technique for soil heavy metal source-sink,the pollution status,ecological risk,and source of heavy metals Cd,Cr,Pb,Zn,Cu and Ni in the sediments of the river system in the 20th century were studied.The potential ecological risk of heavy metals in stream sediments was evaluated using the soil accumulation index,potential ecological risk index,and potential biologi-cal toxicity effect.The correlation analysis,principal component analysis,and PMF model were used for source analysis.The re-sults showed that:① the average values of heavy metals Cd,Cr,Pb,Zn,Cu,and Ni were 0.15,68.07,25.35,66.84,23.98,and 25.59 mg/kg,respectively.Except for Zn,the average contents of other elements exceeded the background values of Chinese stream sediments.Except for Pb and Zn,the average content of other elements exceeded the soil background value of Jiangxi Prov-ince.The distribution areas of high values of 6 kinds of heavy metals were basically the same,mainly distributed in the northeast of the study area.②Soil accumulation index and potential ecological risk index showed that Cd and Cu contributed more.The results of the potential biotoxicity evaluation showed that Ni contributed more.The results of the principal component analysis and PMF model are consistent,and the results show that the 6 heavy metals are mainly from natural sources and controlled by local parent materials.Cd and Cu are the main factors causing environmental risks and need to be paid more attention to.The research results can provide a reference for the prevention and control of heavy metal pollution,water environment,and soil scientific management in this area.
基金项目
江西省重大科技研发专项(20194ABC28010)
江西省自然科学基金(209016963094)
国家科技期刊平台
NSTL
维普
万方数据