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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Oxidative Reaction of Thiosulfate with Hydrogen Peroxide by Freezing
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Oxidative Reaction of Thiosulfate with Hydrogen Peroxide by Freezing

机译：硫代硫酸盐与过氧化氢的冷冻氧化反应

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In order to investigate the characteristics of the oxidative reactions of low-value sulfur compounds with H_2O_2 in the freezing process, a Na_2S_2O-3 aqueous solution was mixed with a H_2O_2 aqueous solution, followed by freezing at - 15 deg C. After the designated time had passed, the concentrations of sulfur compounds were measured. The oxidation of thiosulfates was accelerated due to the freeze-concentration effect. The maximum reaction rate of the freezing reaction (-15 deg C) was about 20-times faster than that in an aqueous solution (25 deg C). In the aqueous-phase reaction, thiosulfates were transformed to tetrathionates as intermediates, or directlyh to sulfates, and all sulfur compounds were finally oxidized to sulfates. On the other hand, the tetrathionates and sulfates transformed by the freezing reaction were preserved in ice for a long time. The maximum amounts of the tetrathionates formed by freezing were about twice those in the aqueous-phase reaction. Once tetrathionates were formed by the freezing reaction, most of the formed tetrathionates coexisting with high concentrations of H_2O_2 were not transformed to sulfate, regardless of whether or not the sample was re-frozen. This observed is probably attributable to the difference in the pH value when tetrathionates are formed.
机译：为了研究冷冻过程中低价硫化合物与H_2O_2的氧化反应特性，将Na_2S_2O-3水溶液与H_2O_2水溶液混合，然后在-15℃下冷冻。通过后，测量了硫化合物的浓度。由于冷冻浓缩作用，硫代硫酸盐的氧化被加速。冷冻反应（-15℃）的最大反应速率比水溶液（25℃）中的最大反应速率快约20倍。在水相反应中，硫代硫酸盐被转化为四硫酸酯作为中间体，或直接转化为硫酸盐，所有硫化合物最终被氧化为硫酸盐。另一方面，通过冷冻反应转化的四硫酸盐和硫酸盐在冰中保存了很长时间。冷冻形成的四硫代酸盐的最大量约为水相反应中的四倍。一旦通过冷冻反应形成了四硫代酸盐，无论样品是否重新冷冻，大多数与高浓度H_2O_2共存的形成的四硫代酸盐都不会转化为硫酸盐。观察到的这可能归因于形成四硫代酸盐时pH值的差异。

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