Abstract

The paper gives a summary of data on the kinetics of oxygen oxidation of sulfite in the presence of manganese(II) salts at ambient temperature in a medium with pH 2–4. The results of data analysis have revealed contradictions and errors in determining the partial orders of this reaction when metal ions are present in excess to sulfite. It is shown that the kinetics of oxidation of sulfite under such conditions actually is of zero order with respect to manganese ions and one and a half order with respect to sulfite, and the reaction rate slightly depends on pH. The averaged observed reaction rate constant is 12 ± 4 L^1/2 mol^–1/2 s^–1. The found new partial orders agree with a common free radical mechanism of this reaction. Using the partial orders redefined in this study for components, it is possible to bring into agreement various data obtained by numerous authors on the kinetics of this environmentally important reaction.

中文翻译：

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锰 (II) 离子催化亚硫酸盐氧化：金属离子过量时的反应动力学

摘要

该论文总结了在环境温度下，在 pH 2-4 的介质中，在锰 (II) 盐存在下，亚硫酸盐的氧氧化动力学数据。数据分析的结果揭示了当金属离子超过亚硫酸盐存在时，在确定该反应的偏序时存在矛盾和错误。结果表明，在这种条件下亚硫酸盐的氧化动力学实际上对于锰离子是零级的，对于亚硫酸盐是一级半的，并且反应速率略微取决于pH值。平均观察到的反应速率常数为 12 ± 4 L ^1/2 mol ^–1/2 s ^–1. 发现的新偏序与该反应的常见自由基机制一致。使用本研究中重新定义的组分偏序，可以将众多作者获得的有关这种环境重要反应动力学的各种数据达成一致。