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首页> 外文期刊>Environmental Science & Technology >Isotopic Fractionation and Source Appointment of Methylmercury and Inorganic Mercury in a Paddy Ecosystem
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Isotopic Fractionation and Source Appointment of Methylmercury and Inorganic Mercury in a Paddy Ecosystem

机译：在稻田生态系统中的同位素分级和甲基汞和无机汞的源儿

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摘要

Bioaccumulation of methylmercury (MeHg) in rice grains has been an emerging issue of human health, but the mechanism of bioaccumulation is still poorly understood. Mercury (Hg) isotope measurements are powerful tools for tracing the sources and biogeochemical cycles of Hg in the environment. In this study, MeHg compound-specific stable isotope analysis (CSIA) was developed in paddy soil and rice plants to trace the biogeochemical cycle of Hg in a paddy ecosystem during the whole rice-growing season. Isotopic fractionation was analyzed separately for MeHg and inorganic Hg (IHg). Results showed distinct isotopic signals between MeHg and IHg in rice plants, indicating different sources. δ~(202)Hg values of MeHg showed no significant differences between roots, stalks, leaves, and grains at each growth stage. The similar △~(199)Hg values of MeHg between rice tissues (0.14 ± 0.08 ‰, 2SD, n = 12), soil (0.13 ± 0.03 ‰, 2SD, n = 4), and irrigation water (0.17 ± 0.09 ‰, 2SD, n = 5) suggested that the soil-water system was the original source of MeHg in rice plants. △~(199)Hg values of IHg in the paddy ecosystem indicated that water, soil, and atmosphere contributed to IHg in grains, leaves, stalks, and roots with varying degree. This study demonstrates that successful application of MeHg CSIA can improve our understanding of the sources and bioaccumulation mechanisms of MeHg and IHg in the paddy ecosystems.
机译：大米谷物中甲基汞（Mehg）的生物累积一直是人类健康的新出现问题，但生物累积机制仍然明白。汞（HG）同位素测量是追踪环境中HG的源和生物地球化学循环的强大工具。在本研究中，在水稻土壤和水稻植物中开发了MeHG复合特异性稳定同位素分析（CSIA），以追踪全稻生态系统中HG的生物地球化学循环。分别分别分析同位素分级，用于MEHG和无机HG（IHG）。结果表明米植物中的Mehg和Ihg之间的明显同位素信号，表明不同的来源。 Δ〜（202）MeHG的Hg值在每个生长阶段的根部，茎秆，叶子和谷物之间没有显着差异。水稻组织（0.14±0.08‰，2SD，N = 12），土壤（0.13±0.03，2SD，N = 4）和灌溉水（0.17±0.09‰ 2SD，n = 5）表明土壤水系统是水稻植物中的MEHG原始来源。 △〜（199）稻田IHG的Hg值表明，水，土壤和大气在谷物，叶子，茎秆和根系中贡献的水，叶子，茎秆和具有不同程度的根。本研究表明，成功应用Mehg CSIA可以改善我们对稻田和IHG的来源和生物累积机制的理解，在稻田生态系统中。

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  • 来源
    《Environmental Science & Technology》 |2020年第22期|14334-14342|共9页
  • 作者

    Chongyang Qin; Buyun Du; Runsheng Yin; Bo Meng; Xuewu Fu; Ping Li; Leiming Zhang; Xinbin Feng;

  • 作者单位

    State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China;

    State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China;

    State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China;

    State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061 China;

    State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061 China;

    Air Quality Research Division Science and Technology Branch Environment and Climate Change Canada Toronto M3H 5T4 Canada;

    State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    methylmercury; mercury isotope; paddy ecosystem; accumulation;

    机译：甲基汞;水星同位素;稻田生态系统;积累;

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