Phytic acid is a common phosphate monoester that is present in soils due to the deposition of plant-derived materials. Thus far, its interaction with dissolved Fe and Fe minerals has not been as extensively investigated as phosphate, although it is expected be highly reactive due to its multiple phosphate functional groups. In this study, the effects of phytic acid on the formation of iron oxyhydroxide was investigated at near neutral pH as a function of the phytic acid/Fe ratio (0.05–0.5) and aging time using zeta potential measurements, X-ray diffraction, Fe K-edge X-ray absorption spectroscopy, and scanning electron transmission spectroscopy. It was found that an iron(III) phytate-like precipitate was formed when the phytic acid/Fe ratio was as low as 0.05. On increasing the ratio to 0.5, the quantity of iron(III) phytate-like precipitate increased to ∼60% in the ferrihydrite background. Interestingly, 10 month aging at 22 °C or hydrothermal treatment at 70 °C for 60 h did not transform the background ferrihydrite into goethite or hematite, suggesting the adsorbed phytic acid played an important role in inhibiting the transformation of ferrihydrite. The adsorption and incorporation of phytic acid into the Fe(III)O₆ polymers should be useful in understanding the complex phosphorus, iron, and hard acid chemistry in a terrestrial environment.

中文翻译：

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植酸共沉淀对水铁矿转化的影响。

植酸是一种常见的磷酸单酯，由于植物来源材料的沉积而存在于土壤中。迄今为止，尽管它由于具有多个磷酸盐官能团而具有很高的反应活性，但它与磷酸盐和铁矿物质的相互作用还没有像磷酸盐那样得到广泛研究。在这项研究中，研究了植酸对中性pH值附近植酸/铁比（0.05-0.5）和老化时间的影响的植酸对羟基氧化铁形成的影响，方法是使用ζ电位测量，X射线衍射，Fe K边缘X射线吸收光谱法和扫描电子透射光谱法。发现当植酸/ Fe之比低至0.05时，形成植酸铁（III）样沉淀。在将比率增加到0.5时，在水铁矿背景中，类似植酸铁（III）的沉淀物的含量增加到约60％。有趣的是，在22°C下老化10个月或在70°C下进行水热处理60 h不会将背景亚铁酸盐转变为针铁矿或赤铁矿，表明吸附的植酸在抑制亚铁酸盐转变中起了重要作用。植酸在Fe（III）O中的吸附和结合_6种聚合物应有助于理解地球环境中复杂的磷，铁和硬酸化学。