Reactions between cyanide and compounds, which contain S–S bonds, in aqueous media result in formation of thiocyanate. In this work, we studied the kinetics of reactions of thiosulfate with free cyanide and its complexes under environmental conditions. Rates of reactions between cyanide species and thiosulfate decrease in the following order: CN⁻ > HCN > [Fe(CN)₆]³⁻ > [Fe(CN)₆]⁴⁻. However, at neutral and slightly acidic pH range, reaction of thiosulfate with iron-cyanide complexes outcompetes its reaction with free cyanide, which exists in equilibrium with complexed cyanide. At environmentally relevant conditions, the characteristic time of reaction between free cyanide and thiosulfate was found to be tens of thousands of years, while for iron-cyanide complexes it was found to be hundreds to millions of years. Examples of application of kinetic parameters for calculation of rates of cyanide consumption in industrial (coke oven wastewater) and non-polluted natural aquatic system (Delaware Great Marsh) are provided.

中文翻译：

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氰化物及其铁配合物与硫代硫酸盐反应生成硫氰酸盐的动力学

氰化物与含有S–S键的化合物在水性介质中的反应会导致形成硫氰酸盐。在这项工作中，我们研究了在环境条件下硫代硫酸盐与游离氰化物及其配合物的反应动力学。氰化物物类和以下列顺序降低硫代之间的反应率：CN ^-  > HCN>的[Fe（CN）₆ ] ^3-  >的[Fe（CN）₆ ] ^4-。但是，在中性和弱酸性pH范围内，硫代硫酸盐与氰化铁络合物的反应胜过了其与游离氰化物的反应，后者与络合物氰化物处于平衡状态。在与环境相关的条件下，发现游离氰化物与硫代硫酸盐之间的特征反应时间为数万年，而对于氰化铁络合物则为数百至数百万年。提供了用于计算工业（焦炉废水）和无污染自然水生系统（特拉华大沼泽）中氰化物消耗速率的动力学参数应用示例。