北京市昌平区南口镇土壤重金属污染风险评估及来源分析  

Risk assessment and source analysis of heavy metals in soil,Nankou Town,Changping District,Beijing

作　　者：贾唯远 刘清俊 刘芬芬 孟美杉 白江伟 顾海波 王天宇 罗伊 JIA Weiyuan;LIU Qingjun;LIU Fenfen;MENG Meishan;BAI Jiangwei;GU Haibo;WANG Tianyu;LUO Yi(Beijing Institute of Eco-Geology,Beijing 100120,China)

机构地区：[1]北京市生态地质研究所,北京100120

出　　处：《城市地质》2024年第2期167-175,共9页Urban Geology

基　　金：北京市昌平南口示范区地表基质调查与评价研究项目(PXM2021_158307_000007)资助。

摘　　要：采集昌平南口镇473件表层土壤样品,收集65件土壤样品(1970年采集的),测试土壤中砷(As)、镉(Cd)、铜(Cu)、铬(Cr)、汞(Hg)、铅(Pb)、镍(Ni)、锌(Zn)等8种重金属元素及三氧化二铝(Al_(2)O_(3))、二氧化硅(SiO_(2))和三氧化二铁(Fe_(2)O_(3))等地球化学指标。采用多种污染评价方法和统计学方法,运用Pearson相关性分析和主成分分析,评估土壤重金属污染风险,分析污染来源。结果表明:重金属Cd含量普遍较高,超筛选值点位较广,Pb、Hg、Cr、Ni、Cu、Zn存在个别点位超筛选值的情况;Cd、Hg、Pb、Zn存在轻微及以上污染点位,Pearson相关性分析和主成分分析显示Cd、Hg、Zn来源相近;Cd和Zn的人为贡献率在1970—2021年间增长明显,且平均值明显高于北京地区背景值,表明研究区可能存在一定的人为污染。473 surface soil samples and 65 soil samples were collected from Nankou Town,Changping,to test for eight heavy metal elements including arsenic(As),cadmium(Cd),copper(Cu),chromium(Cr),mercury(Hg),lead(Pb),nickel(Ni),and zinc(Zn),as well as geochemical indicators such as aluminum(Al_(2)O_(3)),silicon(SiO_(2)),and iron oxide(Fe_(2)O_(3)).Various pollution evaluation methods and statistical methods were adopted.Pearson correlation analysis and principal component analysis were used to assess the risk of soil heavy metal pollution and analyze the pollution sources.The results show that heavy metal Cd content is generally high;super screening value points are wide spread;some individual points exceed the screening values with Pb,Hg,Cr,Ni,Cu,and Zn;and mild or above pollution points exist with Cd,Hg,Pb,and Zn.Pearson correlation analysis and principal component analysis show that the sources of Cd,Hg,Zn are similar;the human contribution rate of Cd and Zn increased significantly from 1970 to 2021,and the average value is significantly higher than the background value in Beijing,indicating the presence of man-made pollution in the study area.

关 键 词：南口镇 筛选值 背景值 地积累指数 人为贡献率 重金属污染评估 来源分析 主成分分析 

分 类 号：X53[环境科学与工程—环境工程] X820.4