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引用本文:易玲,高柏,丁小燕,马文洁,杜超超,樊骅,李艳梅.鄱阳湖流域上游铀尾矿库周边水体中铬形态及健康风险评估.湖泊科学,2020,32(1):79-88. DOI:10.18307/2020.0108
YI Ling,GAO Bai,DING Xiaoyan,MA Wenjie,DU Chaochao,FAN Hua,LI Yanmei.Species and health risk assessment of chromium around uranium tailing pond in the upper reaches of Lake Poyang Basin. J. Lake Sci.2020,32(1):79-88. DOI:10.18307/2020.0108
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鄱阳湖流域上游铀尾矿库周边水体中铬形态及健康风险评估
易玲1, 高柏1, 丁小燕2, 马文洁1, 杜超超1, 樊骅1, 李艳梅1
1.东华理工大学核资源与环境国家重点实验室, 水资源与环境工程学院, 南昌 330013;2.中国科学院南京土壤研究所, 南京 210008
摘要:
以鄱阳湖流域上游铀尾矿库周边水体为研究对象,在研究铬(Cr)污染程度的基础上,采用水文地球化学模拟软件PHREEQC计算Cr各不同赋存形态的浓度,讨论不同条件下Cr形态的变换规律以及健康风险评价,对研究水体中Cr生物有效性具有实际意义.结果表明:铀尾矿区排放水、渗滤水、浅层地下水中Cr浓度均未超出相关标准值.水体中Cr主要赋存形态大多为Cr(Ⅲ)的水解产物Cr(OH)2+和Cr(OH)2+.pH和电子活度(pe)共同影响Cr在水体中的赋存形态,当pH=3~5时,以CrF2+为优势离子;当pH > 5时,随pH递增,pe值对Cr赋存形态的影响增加,pe值增大,Cr(Ⅲ)水解产物浓度逐渐减少,而Cr(Ⅵ)氧化产物逐渐增加.浅层地下水中的Cr不会对人体产生致癌风险和非致癌风险,但当pH、pe变化时,Cr致癌风险系数均高于ICRP和USEPA推荐的最大可接受值.由于Cr(Ⅵ)的毒性远强于Cr(Ⅲ),故应密切关注水体中pe与pH值,避免污染加重.
关键词:  铬(Cr)  PHREEQC  赋存形态  风险评价  鄱阳湖流域
DOI:10.18307/2020.0108
分类号:
基金项目:国家自然科学基金项目(41362011,41502235)和江西省重点研发计划项目(20181ACG70023)联合资助.
Species and health risk assessment of chromium around uranium tailing pond in the upper reaches of Lake Poyang Basin
YI Ling1, GAO Bai1, DING Xiaoyan2, MA Wenjie1, DU Chaochao1, FAN Hua1, LI Yanmei1
1.State Key Laboratory of Nuclear Resources and Environment, School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, P. R. China;2.Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
Taking the water around the uranium tailing pond in the upper reaches of Lake Poyang Basin as the research object, the pollution characteristics of chromium (Cr) were studied, and the contents of Cr in different speciations were calculated by the hydrogeochemical simulation software PHREEQC. Then the morphological variations under different conditions were discussed, and health risk assessment was realized. The results showed that the concentrations of Cr in the uranium tailing discharge water, tailing leachate and shallow groundwater did not exceed the relevant standard values. It was found that trivalent chromium was the main form with exhibition of Cr(OH)2+ and Cr(OH)2+ in most samples. Chromium speciation were affected by pH and electron activity (pe) together. In the condition of pH=3-5, CrF2+ was the dominant species. When pH>5, the effect of pe value on the chromium speciation was more obvious with the increase of pH. When the pe value increased, the concentration of hydrolysate Cr(Ⅲ) decreased gradually but the oxidation product Cr(Ⅵ) increased gradually. The health risk assessment proves that chromium in shallow groundwater did not cause carcinogenic risk and non-carcinogenic risk to human health. While the pH and pe changed, the carcinogenic risk coefficient of chromium will be higher than the maximum acceptable level recommended by ICRP and USEPA. As the toxicity of hexavalent chromium is much stronger than trivalent, it is necessary to pay close attention to the pe and pH values in the water to avoid the increase of pollution.
Key words:  Chromium(Cr)  PHREEQC  speciation  risk assessment  Lake Poyang Basin
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