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题名: 小浪底水库鱼体和沉积物中汞稳定同位素组成特征
作者: 花秀兵; 毛宇翔; 刘洪伟; 程柳; 史建波; 江桂斌
刊名: 环境化学
出版日期: 2016
卷号: 35, 期号:11, 页码:2245-2252
关键词: ; 同位素 ; 质量分馏 ; 非质量分馏
其他题名: Characteristics of stable mercury isotopic compositions in fish and sediments from Xiaolangdi Reservoir
中文摘要: 使用多接收器电感耦合等离子体质谱仪(MC-ICP-MS)测定了小浪底水库鱼体和沉积物中汞同位素的组成.结果显示,小浪底水库鱼体具有偏负的delta~(202)Hg和偏正的Delta~(199)Hg(delta~(202)Hg:-0.260.30;Delta~(199)Hg:0.790.08),而沉积物比鱼体具有更加偏负的delta~(202)Hg和趋近于0值的Delta~(199)Hg(delta~(202)Hg:-1.480.38;Delta~(199)Hg:0.010.02).与以往的研究相比,小浪底水库鱼体内汞同位素特征与淡水水库区域鱼体中类似,而Delta~(199)Hg/Delta~(201)Hg的比值为1.22,表明小浪底水库鱼体内汞的非质量分馏主要是甲基汞的光化学降解产生的;沉积物的同位素特征表明其受到了人为源排放的影响.鱼体内delta~(15)N数据表明在营养转移的过程中会发生质量分馏,但不会发生非质量分馏.
部门归属: 环境化学与生态毒理学国家重点实验室
英文摘要: The isotopic compositions of mercury (Hg) in fish and sediment samples collected from the Xiaolangdi Reservoir,Henan province, were determined using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Negative delta~(202)Hg (-0.260.30) and positive Delta~(199)Hg (0.79 0.08) observed in fish samples are similar to those in fish species from freshwater reservoirs reported in previous studies. The slope of Delta~(199)Hg /Delta~(201)Hg in fish was 1.22, indicating the mass independent fractionation in fish from the Xiaolangdi Reservoir subject to the photodegradation of monomethylmercury. Negative delta~(202)Hg (-1.480.38) and near-zero Delta~(199)Hg (0.010.02) in sediments indicate the influence of anthropogenic emission. The relationships between mercury isotopic compositions and delta~(15)N in fish indicate that the mass-dependent fractionation occured during trophic transfer,while mass-independent fractionation was absent during this process.
收录类别: CSCD
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36620
Appears in Collections:环境化学与生态毒理学国家重点实验室_期刊论文

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