摘要
为了解广州市钟落潭镇的土壤重金属污染程度和风险现状,调查分析了 33个土壤样品的重金属元素含量(As、Cd、Cr、Cu、Hg、Ni、Pb、Zn),并采用富集因子(EF)、内梅罗综合污染指数(PN)和潜在生态风险指数(RI)3项指标分别评价土壤单一重金属元素富集程度、多元素综合污染程度和综合潜在生态风险.结果表明:钟落潭镇土壤重金属元素处于无富集～少量富集状态,单一重金属元素均未达到污染水平,土壤总体属于清洁状态;西部区域潜在生态风险主要以中等风险为主,东部主要以低风险为主;中部偏西区域存在局部的重度风险区,其中As、Cd和Hg元素是潜在生态风险的主要贡献者.结合相关性矩阵与主成分研究结果进一步发现,Cr、Cu、Ni、Pb和Zn等元素含量主要受以土壤母质为主的自然源影响,As和Hg则可能受工业污水排放、农药化肥、采矿等人为源影响,Cd则受自然源和人为源共同影响.
Abstract
In order to comprehensively understand the pollution degree and risk status of soil heavy metals in Zhongluotan Town,Guangzhou City,the contents of heavy metal elements(As,Cd,Cr,Cu,Hg,Ni,Pb and Zn)in 33 soil samples were investigated and analyzed.The enrichment factor(EF),Nemerow compre-hensive pollution index(P N)and potential ecological risk index(RI)were used to evaluate the concentra-tion degree of single heavy metal elements,comprehensive pollution degree of multiple elements and com-prehensive potential ecological risk.The results showed that the heavy metal elements in the soil of Zhongluotan Town were in the state of no enrichment to a small amount of enrichment,and the single heavy metal elements did not reach the pollution level.The potential ecological risks in the western region are mainly moderate,while in the eastern region,the potential ecological risks are mainly low.There was a local severe risk area in the western part of central China,in which As,Cd and Hg were the main contribu-tors to the potential ecological risk.Combined with the correlation matrix and principal component study results.Cr,Cu,Ni,Pb and Zn mainly affected by the natural sources mainly composed of soil parent materi-als.As and Hg may be affected by industrial sewage discharge,pesticide and fertilizer,mining and other hu-man sources.Cd is affected by both natural and anthropogenic sources.
基金项目
广东省城市感知与监测预警企业重点实验室基金项目(2020B121202019)
广州市城市规划勘测设计研究院科技基金项目(RDI2210204049)
维普
万方数据