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首页> 外文期刊>Environmental Science & Technology >Role of Heterogeneous Precipitation in Determining the Nature of Products Formed on Oxidation of Fe(Ⅱ) in Seawater Containing Natural Organic Matter
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Role of Heterogeneous Precipitation in Determining the Nature of Products Formed on Oxidation of Fe(Ⅱ) in Seawater Containing Natural Organic Matter

机译：非均相沉淀在确定天然有机物海水中Fe（Ⅱ）氧化形成的产物的性质中的作用

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摘要

A detailed kinetic model has been developed to describe the formation of the oxidation products, organically complexed Fe(Ⅲ) and amorphous ferric oxide (AFO), on oxidation of Fe(Ⅱ) in seawater containing Suwannee River fulvic acid (SRFA). Experimental data were collected using spectrophotometric detection of the Fe(Ⅲ)-SRFA complex for a range of initial concentrations of Fe(Ⅱ) and SRFA. Initial sensitivity analysis identified rate constants to which the model was most sensitive including those for heterogeneous precipitation of AFO and Fe(Ⅱ)-SRFA formation and dissociation which to date have only been determined with a high degree of uncertainty. Using these rate constants as fitting parameters, an accurate fit to the experimental data could be obtained using a kinetic model describing key processes. However, reasonable fits could only be achieved with the inclusion of the heterogeneous precipitation reaction suggesting the importance of this reaction in determining the outcome of oxidation in the presence of organic ligands. The rate constants for Fe(Ⅱ)-SRFA formation and dissociation were highly correlated and could not be determined uniquely, however their ratio revealed a stability constant of ～10~5,3 orders of magnitude higher than previously reported. The fitted model also suggested that a complex interaction between Fe(Ⅱ) and SRFA in the initial stages of the oxidation process determines the pathway of Fe(Ⅲ)-SRFA formation.
机译：建立了详细的动力学模型，描述了在含苏旺尼河黄腐酸（SRFA）的海水中Fe（Ⅱ）氧化时有机合成的Fe（Ⅲ）和非晶态三氧化二铁（AFO）的氧化产物的形成。用分光光度法检测Fe（Ⅲ）-SRFA配合物在一定范围的初始Fe（Ⅱ）和SRFA浓度下收集实验数据。最初的敏感性分析确定了模型最敏感的速率常数，包括那些对于AFO和Fe（Ⅱ）-SRFA形成和解离的非均相沉淀的速率常数，到目前为止，这些常数仅在高度不确定的情况下才能确定。使用这些速率常数作为拟合参数，可以使用描述关键过程的动力学模型获得对实验数据的精确拟合。但是，只有包含非均相沉淀反应才能实现合理的拟合，表明该反应在确定有机配体存在下氧化结果中的重要性。 Fe（Ⅱ）-SRFA形成和解离的速率常数高度相关，无法唯一确定，但是它们的比率显示出比以前报道的稳定常数高约10〜5.3个数量级。拟合模型还表明，在氧化过程的初期，Fe（Ⅱ）与SRFA之间的复杂相互作用决定了Fe（Ⅲ）-SRFA的形成途径。

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  • 来源
    《Environmental Science & Technology》 |2010年第17期|p.6667-6673|共7页
  • 作者

    MARK W. BLIGH; T. DAVID WAITE;

  • 作者单位

    School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;

    rnSchool of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;

  • 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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