Influence of the Isotopic Composition of Aqueous Solutions on the Kinetics of the Redox Process

Abstract

The article presents a study of the reaction rate of reduction of an aqueous solution of methylene blue Mb⁺ to its leukoform MbH⁰ when adding a solution of ascorbic acid. The possibility of controlling the rate of redox reactions accompanied by proton transfer in aqueous solutions is shown. The reaction rate is controlled by varying the deuterium content in water over a fairly narrow range of values. The reaction rate was controlled by changing the intensity of the spectra of solutions in the range of 500--700 nm. The rate of the redox process, a reaction involving methylene blue, depends on the deuterium content and has a nonmono-tonic character with a local minimum in the range of 10²--10⁴ ppm. The possibility of controlling the rate of the Mb⁺ reduction reaction to its MbH⁰ leukoform by using an ascorbic acid solution prepared on a water basis with an adjacent isotopic composition is shown. The reduction reaction rate of a methylene blue solution prepared with light water decreased by 1.4 times when using an ascorbic acid solution prepared with D₂O. For the methylene blue solution prepared in distilled water, the reaction rate decreased by 1.65 times. For the methylene blue solution prepared with D₂O and ascorbic acid solution prepared with light water, the reaction rate increased by more than 2 times. The dependence of the completeness of the reaction on the isotopic composition of the aqueous base is determined

Please cite this article in English as:

Bunkin N.F., Timchenko S.L., Bolotskova P.N., et al. Influence of the isotopic composition of aqueous solutions on the kinetics of the redox process. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2025, no. 4 (121), pp. 78--95 (in Russ.). EDN: QYDUNY

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