高低锑地下水溶解性有机物分子组成差异和控锑机制分析
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1.湖南省自然资源事务中心;2.华北科技学院 化工安全学院

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TD745

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湖南省自然资源厅科技计划项目(20230150ST); 河北省自然科学(D2021508004);第一作者:梅金华(1972-),女,硕士,研究员级高级工程师。主要从事水工环地质、矿山生态修复方面的研究。Email:292381529@qq.com*通信作者:郝春明(1978-),男,汉族,河北廊坊人,博士,副教授。研究方向:矿山环境污染防治与生态修复。E-mail: haocm@ ncist.edu.cn ,3,孙倩倩2,郝春明2,3,李海兵1,3


Molecular composition of dissolved organic matter and mechanism on antimony activities in high and low antimony groundwater
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1.Hunan Center of Natural Resources Affairs,Changsha;2.China;3.North China Institute of Science and Technology,Hebei,;4.PR China;5.Observation and Research Station of Lengshuijiang mining ecological environmental monitoring,Ministry of Natural Resources,Changsha;6.North China Institute of Science and Technology,Hebei

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    摘要:

    溶解有机质(DOM)的荧光组分可有效的调控锑(Sb)在地下水中的运移。然而,其分子组成对Sb环境行为的影响还不明晰。为此,本文采集了湖南锡矿山锑矿区10组高低Sb地下水样品,通过对比分析DOM分子组成的差异,揭示了DOM分子组成对高Sb地下水形成的调控机制。研究结果表明高低锑地下水中DOM的含量分别为2.24 mg/L~10.45 mg/L(均值5.19 mg/L)和3.22 mg/L~3.23 mg/L(均值3.23 mg/L)。相比低Sb地下水,高Sb地下水拥有较多的高度不饱和烃类和多酚,较低的脂肪类化合物、饱和烃类和多环芳烃。高O/C>0.50和低H/C<1.20的高度不饱和烃类和多酚与Sb浓度密切正相关。大分子芳香族DOM可通过与Sb(V)竞争吸附沉积物界面的吸附点位,与Fe和Sb(V)形成DOM-Fe-(V)络合物,以及增强Fe(Ⅱ)和Sb(Ⅲ)共氧化速率来促进高Sb地下水的形成。

    Abstract:

    The fluorescence components of dissolved organic matter (DOM) is a crucial controlling factor in mobilizing antimony in groundwater. However, the effect of molecular composition of DOM on Sb behaviors is still unclear. Hence a total of 10 samples were collected from high- and low-Sb groundwater in the Xikuangshan mine to compare the molecular composition of DOM and to determine the roles of DOM in Sb mobility. The results showed that the DOM content in high- and low-Sb groundwater was 2.24 mg/L~10.45 mg/L(mean 5.19 mg/L) and 3.22 mg/L-3.23 mg/L(mean 3.23 mg/L), respectively. Compared with low-Sb groundwater, high-Sb groundwater has more highly unsaturated and phenolic compounds and polyphenols, and lower aliphatic compounds, saturated compounds and polycyclic aromatics. Sb positively associated with high O/C ratio (O/C > 0.5) and low H/C ratio molecules (H/C <1.2), which mainly grouped as highly unsaturated and phenolic compounds and polyphenols. Complexing agents with Fe and Sb(V), competitive adsorption with Sb(V), and accelerating the rate of Sb(III) and Fe(II) co-oxidation were considered as the formation mechanisms for DOM on Sb migration at a molecular level.

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梅金华,兰建梅,孙倩倩,等. 高低锑地下水溶解性有机物分子组成差异和控锑机制分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-30
  • 最后修改日期:2024-05-22
  • 录用日期:2024-06-05
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