Cr(Ⅵ)踪迹指标现场测定用于铬污染地下水源解析  

Field Determination of Trace Ion in Cr(Ⅵ)-polluted Groundwater and Its Application in Source Apportionment

作　　者：边超[1] 蔡五田[1] 吕永高[1] 张维 杨骊 刘金巍[1] BIAN Chao;CAI Wutian;LYU Yonggao;ZHANG Wei;YANG Li;LIU Jinwei(Center for Hydrogeology and Environmental Geology Survey,CGS,Baoding 071051,China;Baoding Center for Disease Control and Prevention,Baoding 071000,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051 [2]河北省保定市疾病预防控制中心,河北保定071000

出　　处：《环境科学与技术》2020年第2期150-155,共6页Environmental Science & Technology

基　　金：国家水体污染控制与治理科技重大专项子课题(2018ZX07109-001-02);国家重点研发计划科技基础资源调查专项课题(2017FY100401)。

摘　　要：根据研究区地下水样品测试结果,该文选定与Cr(Ⅵ)极强相关,且物理化学性质较稳定的钠离子作为研究地下水中Cr(Ⅵ)迁移规律的踪迹指标,并采用钠离子复合电极建立了踪迹指标现场检测方法。实验结果表明,钠离子浓度在5~500 mg/L线性范围内的电极响应斜率为-61.09 mV/pNa(103%),方法检出限为0.69 mg/L,加标回收率为92.8%~103.4%,现场测试结果与实验室测试结果一致。该研究根据踪迹指标钠离子与污染物现场检测数据,构建了钠离子与Cr(Ⅵ)浓度比值的对数函数,并有效识别出主污染源、次级污染源、污染物迁移主路径、潜在污染区、潜在影响区及背景区,为铬渣类污染场地土壤和地下水环境风险评价及污染修复提供了技术支撑和参考依据。According to the test results of groundwater samples in study area,sodium ion,which is highly correlated with Cr(Ⅵ)and has stable physical and chemical properties,was selected as the trace index to study the migration law of Cr(Ⅵ)in groundwater.In this paper,an on-site detection method of trace ion was established by sodium ion composite electrode,and the accuracy of method was studied.Results indicate that,the electrode response slope was-61.09 mV/pNa(103%),the detection limit was 0.69 mg/L,the recovery rate(n=5)was 92.8%~103.4%,and the field test results were in agreement with the laboratory test results.The logarithmic function of the ratio of sodium ion and Cr(Ⅵ)concentration was constructed based on the on-site detection data of trace ion and pollutant,and the main pollution source,secondary pollution source,main pathway of pollutant migration,potential pollution area,potential impact area and background area were effectively identified,which can provide technical support and reference basis for the environmental risk assessment and contamination remediation of soil and groundwater in chrome-slag contaminated sites.

关 键 词：铬 踪迹指标 迁移规律 钠离子 现场检测 

分 类 号：X523[环境科学与工程—环境工程]