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土壤和底泥间隙水中汞-硫-铁纳米颗粒物的形成条件、结构特征及其在甲基汞生物合成中的作用

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吉云芸, 杨麒弘, 张彤. 土壤和底泥间隙水中汞-硫-铁纳米颗粒物的形成条件、结构特征及其在甲基汞生物合成中的作用[J]. 环境化学, 2020, (1): 1-7. doi: 10.7524/j.issn.0254-6108.2019092705
引用本文: 吉云芸, 杨麒弘, 张彤. 土壤和底泥间隙水中汞-硫-铁纳米颗粒物的形成条件、结构特征及其在甲基汞生物合成中的作用[J]. 环境化学, 2020, (1): 1-7. doi: 10.7524/j.issn.0254-6108.2019092705
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JI Yunyun, YANG Qihong, ZHANG Tong. Formation and structure of mercury-sulfide-iron nanoparticles and their role in the microbial production of methylmercury in soil and sediment porewater[J]. Environmental Chemistry, 2020, (1): 1-7. doi: 10.7524/j.issn.0254-6108.2019092705
Citation: JI Yunyun, YANG Qihong, ZHANG Tong. Formation and structure of mercury-sulfide-iron nanoparticles and their role in the microbial production of methylmercury in soil and sediment porewater[J]. Environmental Chemistry, 2020, (1): 1-7. doi: 10.7524/j.issn.0254-6108.2019092705
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土壤和底泥间隙水中汞-硫-铁纳米颗粒物的形成条件、结构特征及其在甲基汞生物合成中的作用

  • 南开大学环境科学与工程学院, 教育部环境污染过程与基准重点实验室, 天津市城市生态环境修复与污染防治重点实验室, 天津, 300350

    • 通讯作者: 张彤, E-mail: zhangtong@nankai.edu.cn
  • 基金项目:

    国家自然科学基金（41603099）资助.

Formation and structure of mercury-sulfide-iron nanoparticles and their role in the microbial production of methylmercury in soil and sediment porewater

  • College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, 300350, China

    • Corresponding author: ZHANG Tong, zhangtong@nankai.edu.cn
  • Fund Project: Supported by the National Natural Science Foundation of China (41603099).

  • 摘要: 如何有效降低具有强生物毒性的甲基汞的生成和积累是汞污染研究领域的热点和难点.目前，国内外学术界对于甲基汞生物合成的反应机理，特别是究竟哪种无机汞化合物可以被厌氧微生物转化为甲基汞尚缺乏系统准确的认识.本文以阐明土壤和底泥间隙水这一甲基汞生成和积累的主要环境中无机汞的化学存在形式及其甲基化倾向为目标，研究该环境中大量存在的还原性铁对甲基汞生物合成前体物质的影响.本项目将研究不同环境条件下汞-硫-铁之间的相互作用，明确该过程的反应产物，特别是汞-硫-铁纳米颗粒物的形成条件、稳定性和结构特征；分析这种复合纳米颗粒物对于甲基化微生物的生物可利用性；考察纳米颗粒物向微生物细胞内部传递甲基汞前体物质的方式，包括溶解、巯基络合离子交换、穿越细胞膜等.本研究可为建立基于环境指标预测甲基汞合成的量化模型提供理论基础，对准确评价汞污染产生的环境风险，有效开展环境修复具有重要的理论意义和应用价值.
    Abstract: How to effectively reduce the generation and accumulation of the potent toxin, methylmercury, has been the focus of recent research on mercury pollution. Thus far, the mechanism of microbial generation of methylmercury, particularly what forms of inorganic mercury can be methylated by anaerobic bacteria, remains poorly understood. The overarching goal of the proposed project is to elucidate the speciation and methylation potential of inorganic mercury in soil and sediment porewater, where microbial production of methylmercury often occurs. This research will study the effect of reduced iron, which is abundant in porewater, on the precursor of mercury methylation. Specifically, this research will investigate the reactions between mercury, sulfide and iron under various environmental conditions that lead to a series of products, including mercury-sulfide-iron nanoparticles. This research will evaluate the formation, stability and structure of these nanoparticles as well as their bioavailability to methylating microorganisms. This research will assess the potential mechanisms via which mercury-sulfide-iron nanoparticles deliver mercury into the cells of the methylating microorganisms for methylation, including dissolution, thiol ligand exchange and cell membrane penetration. This proposed project will help construct quantitative models for predicting methylmercury production based on environmental parameters and provide insight to risk analysis and environmental remediation of mercury pollution.
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  • 收稿日期:  2019-09-27
  • 刊出日期:  2020-01-01

土壤和底泥间隙水中汞-硫-铁纳米颗粒物的形成条件、结构特征及其在甲基汞生物合成中的作用

    通讯作者: 张彤, E-mail: zhangtong@nankai.edu.cn
  • 南开大学环境科学与工程学院, 教育部环境污染过程与基准重点实验室, 天津市城市生态环境修复与污染防治重点实验室, 天津, 300350
  • 收稿日期:  2019-09-27
  • 网络出版日期:  2020-01-01
基金项目:

国家自然科学基金（41603099）资助.

摘要: 如何有效降低具有强生物毒性的甲基汞的生成和积累是汞污染研究领域的热点和难点.目前，国内外学术界对于甲基汞生物合成的反应机理，特别是究竟哪种无机汞化合物可以被厌氧微生物转化为甲基汞尚缺乏系统准确的认识.本文以阐明土壤和底泥间隙水这一甲基汞生成和积累的主要环境中无机汞的化学存在形式及其甲基化倾向为目标，研究该环境中大量存在的还原性铁对甲基汞生物合成前体物质的影响.本项目将研究不同环境条件下汞-硫-铁之间的相互作用，明确该过程的反应产物，特别是汞-硫-铁纳米颗粒物的形成条件、稳定性和结构特征；分析这种复合纳米颗粒物对于甲基化微生物的生物可利用性；考察纳米颗粒物向微生物细胞内部传递甲基汞前体物质的方式，包括溶解、巯基络合离子交换、穿越细胞膜等.本研究可为建立基于环境指标预测甲基汞合成的量化模型提供理论基础，对准确评价汞污染产生的环境风险，有效开展环境修复具有重要的理论意义和应用价值.

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