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Kinetics and mechanism of oxidation of pyruvate by permanganate ion in aqueous perchlorate solution

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Abstract

The kinetics and mechanism of permanganate oxidation of pyruvic acid in aqueous perchlorate at a constant ionic strength of 2.0 mol dm−3 have been investigated spectrophotometrically. The pseudo-first-order plots showed two distinct phases for the reaction, characterized as induction and auto-acceleration periods. The induction phase is relatively slow at the early stages of reaction and is followed by a faster process. The rate law for the oxidation was described by the sum of two exponential terms. The oxidation showed overall second-order kinetics with respect to the reactants in the initial slow phase. However, second-order kinetics was not maintained throughout the faster second stage. The effects of added salts lead to the conclusion that Mn(III) and/or Mn(IV) play the main role in the reaction kinetics of the second stage. A reaction mechanism consistent with the kinetic results is suggested and discussed.

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Acknowledgements

This work was supported by Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt. The authors would like to thank all staff members of Chemistry Department for their continuous encouragement throughout performing this research.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt

    Refat M. Hassan

  2. Chemistry Department, Faculty of Science, Assiut University, New Valley Branch, El-Kharja, New Valley, 72511, Egypt

    Samia M. Ibrahim

  3. Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah Al-Mukarramah, 13401, Saudi Arabia

    Khalid S. Khairou

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  1. Refat M. Hassan
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  3. Khalid S. Khairou
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Correspondence to Refat M. Hassan.

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Hassan, R.M., Ibrahim, S.M. & Khairou, K.S. Kinetics and mechanism of oxidation of pyruvate by permanganate ion in aqueous perchlorate solution. Transit Met Chem 43, 683–691 (2018). https://doi.org/10.1007/s11243-018-0257-x

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