宿州市煤矿区土壤重金属地球化学基线及污染评价研究  

Study on geochemical baseline and contamination evaluation of soil heavy metals in Suzhou coal mining area

作　　者：苏海民 孙朋 张勇 SU Haimin;SUN Peng;ZHANG Yong(College of Environmental and Surveying Engineering,Suzhou University,Suzhou Anhui 234000)

机构地区：[1]宿州学院环境与测绘工程学院,安徽宿州234000

出　　处：《环境污染与防治》2021年第12期1568-1572,1601,共6页Environmental Pollution & Control

基　　金：安徽省高校优秀青年人才计划重点项目(No.gxyqZD2016347);宿州学院优秀人才项目(No.2014XJGG06、No.2018XJHB04);宿州学院资源与环境教学团队项目(No.szxy2018jxtd01);宿州学院土壤生物地理重点课程项目(No.szxy2018zdkc54)。

摘　　要：采集宿州市煤矿区40个土壤样品并测定其Zn、Cr、Cd、Pb、Cu、As的含量,运用标准化法和相对累积频率法确定各重金属的地球化学基线值,在此基础上,利用地积累指数法和富集因子法评价宿州市煤矿区土壤重金属污染富集状况。结果表明:(1)除Cd外宿州市煤矿区土壤重金属含量低于《土壤环境质量农用地土壤污染风险管控标准(试行)》(GB 15618—2018)中的风险筛选值,但基本都高于宿州市非矿区土壤环境背景值;(2)两种方法计算的重金属地球化学基线值比较接近,取两者平均值得到宿州市煤矿区Zn、Cr、Cd、Pb、Cu、As的地球化学基线值分别为63.93、67.20、0.32、20.26、23.62、13.90 mg/kg;(3)6种重金属地积累指数排序为Cd>Cu>Pb>As>Zn>Cr,Cd、Cu和Pb基本处于无污染至轻度污染状态,Zn、Cr和As大多处于无污染状态;(4)宿州市矿区土壤Cd、Cu属中度富集,Pb、As、Zn和Cr为轻度富集,Cd、Cu富集因子呈偏态分布,不同采样点富集程度差异大,Zn、Cr污染程度相对集中、均匀,宿州市煤矿区土壤重金属污染一定程度上受到了人为活动的扰动,主要污染元素为Cd、Cu,其次是Pb。40 soil samples were collected from Suzhou coal mining area,and the contents of Zn,Cr,Cd,Pb,Cu and As in these soil samples were determined.The geochemical baseline of heavy metals were calculated using the standardization method and relative cumulative frequency method,base on which,the soil heavy metals pollution enrichment was evaluated by the geoaccumulation index method and enrichment factor method.Results showed that:(1)the concentration of heavy metals(expect Cd)were lower than the risk screening values of“Soil environmental quality-risk control standard for soil contamination of agricultural land”(GB 15618-2018),but they were all basically higher than the soil environmental background values of non-mining areas in Suzhou.(2)The geochemical baseline value calculated by the standardization method were similar to the relative cumulative frequency method.Takeing the average value of two methods,the geochemical baseline of Zn,Cr,Cd,Pb,Cu,As were 63.93,67.20,0.32,20.26,23.62 and 13.90 mg/kg,respectively.(3)The geoaccumulation indexes of 6 heavy metals followed the order of Cd>Cu>Pb>As>Zn>Cr.Most of Cd,Cu and Pb were no-pollution to mildly pollution,and Zn,Cr and As were no-pollution.(4)The enrichment factor showed Cd and Cu were moderate enrichment,and Pb,As,Zn and Cr were mildly enrichment.The enrichment factors of Cd and Cu were skewed distribution,indicating that the concentrations of heavy metals at different sampling points were significantly different,while the contamination levels of Zn and Pb were relatively concentrated and well-distributed.The heavy metals in Suzhou coal mining area were disturbed by human activities to some extent.The main pollution elements were Cd and Cu,and Pb was next.

关 键 词：重金属 地球化学基线 地积累指数 富集因子 宿州市 煤矿区 

分 类 号：X53[环境科学与工程—环境工程]