We studied sonochemical reactions resulting from ultrasonic treatment of potassium hexacyanoferrate(II) in aqueous solutions using a custom-built apparatus working at 536 kHz. We concluded that primary reactions are completely dominated by oxidation of Fe(II) to Fe(III) and did not find any evidences for degradation of cyanide. At the highest concentration used in the present study (0.1 M) we detected formation of pentacyanoaquaferrate(II) complex, which is most probably formed in reactions between hexacyanoferrate(III) anions and hydrogen atoms or hydrated electrons formed in sonochemical processes. We also determined that hydroxyl radicals formation rate in our system, (8.7 ± 1.5)∙10-8 M∙s-1, is relatively high compared to other reported experiments. We attribute this to focusing of the ultrasonic wave in the sample vessel. Finally, we suggest that oxidation rate of hexacyanoferrate(II) anions can be a convenient benchmark of efficiency of sonochemical reactors.

中文翻译：

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水溶液中六氰合铁酸钾（II）的声化学氧化反应动力学。

我们使用定制的工作频率为536 kHz的设备研究了超声处理六氰合铁酸钾（II）在水溶液中产生的声化学反应。我们得出的结论是，主要反应完全由Fe（II）氧化为Fe（III）进行，没有发现任何氰化物降解的证据。在本研究中使用的最高浓度（0.1 M）下，我们检测到五氰基四水合五价铁（II）配合物的形成，该配合物很可能是六氰合高铁酸根（III）阴离子与氢原子或声化学过程中形成的水​​合电子之间的反应所形成的。我们还确定，与其他报道的实验相比，我们系统中的羟基自由基形成速率（8.7±1.5）∙10-8 M∙s-1相对较高。我们将其归因于超声波在样品容器中的聚焦。最后，