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首页> 外文期刊>Environmental Science & Technology >Formation of Organic Iodine Supplied as Iodide in a Soil-Water System in Chiba, Japan
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Formation of Organic Iodine Supplied as Iodide in a Soil-Water System in Chiba, Japan

机译：日本千叶市土壤-水系统中碘化物形式有机碘的形成

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摘要

Speciation of iodine in a soil-water system was investigated to understand the mechanism of iodine mobility in surface environments. Iodine speciation in soil and pore water was determined by K-edge XANES and HPLC-ICP-MS, respectively, for samples collected at a depth of 0-12 cm in the Yoro area, Chiba, Japan. Pore water collected at a 0～6 cm depth contained 50%-60% of organic iodine bound to dissolved organic matter, with the other portion being I~-. At a 9-12 cm depth, 98% of iodine was in the form of dissolved I~-. In contrast, XANES analysis revealed that iodine in soil exists as organic iodine at all depths. Iodine mapping of soil grains was obtained using micro-XRF analysis, which also indicated that iodine is bound to organic matter. The activity of laccase, which has the ability to oxidize I to I_2, was high at the surface of the soil-water layer, suggesting that iodide oxidizing enzymes can promote iodine organification. The distribution coefficient of organic iodine in the soil-water system was more than 10-fold greater than that of iodide. Transformation of inorganic iodine to organic iodine plays an important role in iodine immobilization, especially in a surface soil-water system.
机译：研究了土壤-水系统中碘的形态，以了解表面环境中碘迁移的机理。在日本千叶县Yoro地区，用K-edge XANES和HPLC-ICP-MS分别测定了土壤和孔隙水中的碘形态。在0〜6 cm深度收集的孔隙水含有50％-60％的有机碘与溶解的有机物结合，其余部分为I〜-。在9-12厘米深处，98％的碘以溶解的碘形式存在。相反，XANES分析表明，土壤中的碘在所有深度都以有机碘的形式存在。使用微型XRF分析获得了土壤颗粒的碘图，这也表明碘与有机物结合。漆酶具有将I氧化为I_2的能力，在土壤-水层表面具有很高的活性，这表明碘氧化酶可以促进碘的组织。在土壤-水系统中有机碘的分配系数比碘化物大10倍以上。无机碘向有机碘的转化在固定碘中起着重要作用，特别是在地表土壤-水系统中。

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  • 来源
    《Environmental Science & Technology》 |2011年第6期|p.2086-2092|共7页
  • 作者

    Yoko S. Shimamoto; Yoshio Takahashi; Yasuko Terada;

  • 作者单位

    Department of Earth and Planetary Systems Science, Faculty of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;

    Department of Earth and Planetary Systems Science, Faculty of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;

    SPring-8, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5158, Japan;

  • 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);
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  • 正文语种 eng
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