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首页> 外文期刊>Environmental Science & Technology >A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice
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A New Approach to Sampling Intact Fe Plaque Reveals Si-Induced Changes in Fe Mineral Composition and Shoot As in Rice

机译：采样完整铁斑的新方法揭示了硅诱导的水稻中铁矿物质组成和枝条的变化

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摘要

The Fe (oxyhydr)oxide rind, or Fe plaque, that forms on aquatic plant roots is an important sorbent of metal(loid)s and plays a role in the attenuation of metal(loid) uptake into higher plants. However, the mineral composition of Fe plaque and thus its potential to sorb metal(loid)s is affected by solution chiemistry. the predominant strategy to characterize Fe plaque using dithionite-citrate-bicarbonate (DCB) extraction and elemental analysis reveals total Fe quantity but misses the mineral structure of the Fe (oxyhydr) oxide. Here, we developed a new tedinique using gentle sonication to sample intact Fe plaque from root system and concentrate it for subsequent mineralogical characterization using syndirotron-based X-ray diffaction and X-ray absorption spectroscopy. We then coupled that data with conventional DCB enaction. The sample preparation method was effective at concentrating As†bound Fe plaque minerals in a unifonn coating onto membranes that could easily be analyzed with X-ray techniques. Using these methods, we show that the percentage of poorly ordered Fe minerals in Fe plaque increases with increasing pore-water Si in flooded rice paddy soils. These findings have implications for understandng mineral controls on As cycling in the soil-rice nexus, and the sampling approach can be adopted for other aquatic plant systems.
机译：在水生植物根部形成的Fe（羟基）氧化物外皮或Fe斑块是金属（金属）的重要吸附剂，并在金属对高等植物的金属吸收的吸收中起作用。但是，溶液中的铁斑的矿物成分及其吸附金属（胶体）的潜力受到影响。用亚硫酸氢盐-柠檬酸氢盐-碳酸氢盐（DCB）萃取表征铁斑的主要策略是通过元素分析揭示总的铁含量，但却错过了氧化铁的结构。在这里，我们开发了一种新的泰坦尼克号，使用轻柔的超声处理从根系中取样完整的铁斑，并将其浓缩以用于随后的基于Syndirotron的X射线衍射和X射线吸收光谱的矿物学表征。然后，我们将该数据与常规DCB操作结合在一起。样品制备方法可以有效地将单层涂层中的As†结合的Fe斑块矿物浓缩到膜上，该膜很容易用X射线技术分析。使用这些方法，我们表明，淹没的稻田土壤中，斑块中铁矿物质的不良排列比例随孔隙水中硅含量的增加而增加。这些发现对于理解土壤-土壤联系中的砷循环的矿物控制具有意义，并且采样方法可用于其他水生植物系统。

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  • 来源
    《Environmental Science & Technology》 |2017年第1期|38-45|共8页
  • 作者

    Douglas C. Amaral; Guilherme Lopes; Luiz R. G. Guilherme; Angelia L. Seyfferth;

  • 作者单位

    Department of Plant and Soil Sciences, College of Agriculture and Natural Resources, University of Delaware, Newark, Delaware 19716, United States,Soil Science Pepartment, Federal University of Lavras, CEP 37200-000 Lavras, Minas Gerais, Brazil;

    Soil Science Pepartment, Federal University of Lavras, CEP 37200-000 Lavras, Minas Gerais, Brazil;

    Soil Science Pepartment, Federal University of Lavras, CEP 37200-000 Lavras, Minas Gerais, Brazil;

    Department of Plant and Soil Sciences, College of Agriculture and Natural Resources, University of Delaware, Newark, Delaware 19716, United States;

  • 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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