Abstract
The kinetics of oxidant formation in water and aqueous solution of Mohr's salt under the action of radiation from a hot plasma of a spark discharge and products formed in the discharge itself has been investigated. The oxidizing agents are nitrous acid, radicals HO2∙/HO2•−, and a long-lived complex that decompose into peroxynitrite and peroxynitrous acid. Nitrous acid is identified directly by its absorption spectrum. The detector of all active species is ferrous iron in the Mohr's salt solution, which is oxidized to ferric. It has been shown that radiation plays the main role in the formation of oxidants, which creates active species in distilled water at a depth of 3–4 cm. In a solution of Mohr's salt, radiation acts to a depth of no more than 1 cm. Radiation does not carry active species; it creates active species throughout the entire thickness of the liquid that it penetrates. In contrast, cold plasma, itself, carries active species and transfers them to the sample through the gas–liquid interface. Products formed in the water under the action of radiation and water solutes absorb radiation. As a result, after processing the distilled water, the depth of the radiation effect decreases. The mechanism of active species formation under the action of radiation is based on the direct absorption of radiation by the parent molecules, bypassing the stage of ionization. Due to this, the yield of oxidants under the action of hot plasma pulsed radiation turns out to be more appreciable than under the action of cold plasma and reaches ~ 10 (100 eV)−1. Plasma radiation may be a more advantageous technology for producing activated water.
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Piskarev, I.M. Features of the Impact of Pulsed Radiation of Hot Plasma on Water and Aqueous Solutions. Plasma Chem Plasma Process 41, 1347–1361 (2021). https://doi.org/10.1007/s11090-021-10188-1
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DOI: https://doi.org/10.1007/s11090-021-10188-1