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贵州某典型汞矿区流域水稻中总汞和甲基汞含量及暴露风险

李瑞阳 徐晓航 许志东 敖明 商立海 仇广乐 汤顺林

李瑞阳, 徐晓航, 许志东, 敖明, 商立海, 仇广乐, 汤顺林. 贵州某典型汞矿区流域水稻中总汞和甲基汞含量及暴露风险[J]. 环境科学研究, 2016, 29(12): 1829-1839.
引用本文: 李瑞阳, 徐晓航, 许志东, 敖明, 商立海, 仇广乐, 汤顺林. 贵州某典型汞矿区流域水稻中总汞和甲基汞含量及暴露风险[J]. 环境科学研究, 2016, 29(12): 1829-1839.
LI Ruiyang, XU Xiaohang, XU Zhidong, AO Ming, SHANG Lihai, QIU Guangle, TANG Shunlin. Total Mercury and Methylmercury Concentrations and Risk Assessments in Rice Plants Collected from a River Watershed in a Typical Mercury Mining Area of Guizhou[J]. Research of Environmental Sciences, 2016, 29(12): 1829-1839.
Citation: LI Ruiyang, XU Xiaohang, XU Zhidong, AO Ming, SHANG Lihai, QIU Guangle, TANG Shunlin. Total Mercury and Methylmercury Concentrations and Risk Assessments in Rice Plants Collected from a River Watershed in a Typical Mercury Mining Area of Guizhou[J]. Research of Environmental Sciences, 2016, 29(12): 1829-1839.

贵州某典型汞矿区流域水稻中总汞和甲基汞含量及暴露风险

基金项目: 国家重点基础研究计划项目(2013CB430004);国家自然科学基金项目(41273152,0)

Total Mercury and Methylmercury Concentrations and Risk Assessments in Rice Plants Collected from a River Watershed in a Typical Mercury Mining Area of Guizhou

  • 摘要: 鉴于流域尺度内水稻植株不同组织中总汞和甲基汞含量及人群进食稻米的汞暴露风险研究较少,系统采集了贵州省铜仁市受万山废弃汞矿影响的瓦屋河流域内水稻植株及对应根际土壤样品,分析水稻植株不同组织中的w(总汞)、w(甲基汞)及其影响因素,以及流域内人群食用稻米的汞暴露风险.结果表明:瓦屋河流域水稻精米中w(总汞)平均值为(14.2±7.0)μg/kg(范围为4.1~34.0 μg/kg,n=24),精米中w(甲基汞)平均值为(7.229±3.957)μg/kg(范围为1.974~17.364 μg/kg,n=24).精米中w(总汞)与水稻茎、叶中w(总汞)均呈较显著正相关(R=0.531,P<0.01;R=0.499,P<0.05),精米中w(甲基汞)与水稻根、茎中w(甲基汞)也均呈显著正相关(R=0.525,P<0.01;R=0.612,P<0.01);w(总汞)、w(甲基汞)均与土壤理化参数存在一定正相关关系,并均与距污染源距离呈负相关.根据精米中w(甲基汞)平均值,并按照US EPA(美国国家环境保护局)推荐的甲基汞日暴露量(ID)和危害指数(HI)的评估方法计算的瓦屋河流域居民甲基汞日暴露量为(0.075±0.041)μg/(kg·d),低于较为严厉的US EPA推荐的甲基汞日安全摄入量(RfD),危害指数为0.75.从平均状况来看,人体摄入该地区生产的精米相对较为安全.

     

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  • 收稿日期:  2016-06-23
  • 修回日期:  2016-08-27
  • 刊出日期:  2016-12-25

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