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Metal mobilization in soil by two structurally defined polyphenols

机译：两种结构上定义的多酚在土壤中的金属动员

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摘要

Polyphenols including tannins comprise a large percentage of plant detritus such as leaf litter, and affect soil processes including metal dynamics. We tested the effects of tannins on soil metal mobilization by determining the binding stoichiometries of two model polyphenols to Al(III) and Fe(III) using micelle-mediated separation and inductively coupled plasma optical emission spectroscopy (ICP-OES). By fitting the data to the Langmuir model we found the higher molecular weight polyphenol (oenothein B) was able to bind more metal than the smaller polyphenol (epigallocatechin gal late, EGCg). For example, oenothein B bound 9.43 mol Fe mol~(-1), while EGCg bound 4.41 mol of Fe mol~(-1). Using the parameters from the binding model, we applied the Langmuir model for competitive binding to predict binding for mixtures of Al(III) and Fe(lll). Using the parameters from the single metal experiments and information about polyphenol sorption to soils we built a model to predict metal mobilization from soils amended with polyphenols. We tested the model with three natural soils and found that it predicted mobilization of Fe and Al with r~2 = 0.92 and r~2 = 0.88, respectively. The amount of metal that was mobilized was directly proportional to the maximum amount of metal bound to the polyphenol. The secondary parameter in each model was the amount of weak organically chelated Fe or Al that was in the soil. This study provides the first compound-specific information about how natural polyphenols interact with metals in the environment. We propose a model that is applicable to developing phytochelation agents for metal detoxification, and we discuss how tannins may play a role in metal mobilization from soils.
机译：包含单宁酸的多酚占植物碎屑（例如凋落物）的大部分，并影响土壤过程，包括金属动力学。我们使用胶束介导的分离和电感耦合等离子体发射光谱法（ICP-OES），通过确定两种模型多酚与Al（III）和Fe（III）的结合化学计量，测试了单宁酸对土壤金属迁移的影响。通过将数据拟合到Langmuir模型，我们发现，分子量较高的多酚（卵磷脂B）比较小的多酚（表没食子儿茶素半乳糖，EGCg）能结合更多的金属。例如，oenothein B结合了9.43 mol Fe mol〜（-1），而EGCg结合了4.41 mol Fe mol〜（-1）。使用结合模型中的参数，我们将Langmuir模型用于竞争性结合，以预测Al（III）和Fe（III）混合物的结合。使用来自单金属实验的参数和有关多酚吸附到土壤的信息，我们建立了一个模型来预测多酚改性土壤中的金属迁移。我们在三种天然土壤上测试了该模型，发现该模型预测铁和铝的动员程度分别为r〜2 = 0.92和r〜2 = 0.88。动员的金属量与与多酚结合的最大金属量成正比。每个模型中的次要参数是土壤中弱有机螯合的Fe或Al的量。这项研究提供了有关天然多酚如何与环境中的金属相互作用的第一个化合物特定的信息。我们提出了一种模型，该模型适用于开发用于金属排毒的植物螯合剂，并且我们讨论了单宁如何在土壤中的金属动员中发挥作用。

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  • 来源
    《Chemosphere》 |2013年第6期|1870-1877|共8页
  • 作者

    Michael A. Schmidt; Javier M. Gonzalez; Jonathan J. Halvorson; Ann E. Hagerman;

  • 作者单位

    Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, United States;

    National Soil Erosion Research Laboratory, USDA-ARS, West Lafayette, IN 47907, United States;

    Northern Great Plains Research Laboratory, USDA-ARS, Mandan, ND 58554, United States;

    Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, United States;

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

    phytochelation; metal mobilization; tannin; polyphenol; phytoremediation;

    机译：植物螯合;金属动员;单宁多酚;植物修复;

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