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- W2950836422 abstract "Four As(IV) species assumed to be As(OH){sub 4} and HAsO{sub 3}{sup {minus}} and the corresponding bases As(OH){sub 3}O{sup {minus}} and AsO{sub 3}{sup 2{minus}} (pK{sub a} = 7.38 and 7.81, respectively) were observed by the radiolysis technique in aqueous arsenious acid, arsenite, and arsenate solutions. As(OH){sub 4} and As(OH){sub 3}O{sup {minus}} were observed in acid and weakly alkaline solution by the reaction of arsenious acid or arsenite with OH. HAsO{sub 3}{sup {minus}} and/or AsO{sub 3}{sup 2{minus}} are formed by the reaction of e{sup {minus}}{sub aq} with H{sub 2}AsO{sub 4}{sup {minus}} and HAsO{sub 4}{sup 2{minus}}; AsO{sub 3}{sup 2{minus}} is formed by the reaction of arsenite with O{sup {minus}} in strongly alkaline solution and by the reaction of arsenite with the carbonate radical anion CO{sub 3}{sup {minus}}. As(OH){sub 4} and As(OH){sub 3}O{sup {minus}} convert into HAsO{sub 3}{sup {minus}} and AsO{sub 3}{sup 2{minus}} by general-base-catalyzed reactions. In acid solution an equilibrium between As(OH){sub 4} and HAsO{sub 3}{sup {minus}} is observed. The kinetics of dehydration of As(OH){sub 4} suggest a slow dehydration step catalyzed by H{sup +} followed by protolysis. The thermodynamic parameters are reported. By comparison with activation parameters of other dehydration-hydration processes, these values are taken to suggest a cyclic transition state containingmore » an extra water molecule. While As(OH){sub 4} and As(OH){sub 3}O{sup {minus}} react with O{sub 2} to yield directly HO{sub 2} and O{sub 2}{sup {minus}}, HAsO{sub 3}{sup {minus}} and AsO{sub 3}{sup 2{minus}} react with O{sub 2} with formation of a relatively stable complex that subsequently decomposes to HO{sub 2} or O{sub 2}{sup {minus}} in reactions catalyzed by H{sup +} and OH{sup {minus}}. The various As(IV) species disappear in second-order reactions. 42 refs., 8 figs., 2 tabs.« less" @default.
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- W2950836422 date "1989-10-31" @default.
- W2950836422 modified "2023-09-24" @default.
- W2950836422 title "ChemInform Abstract: Arsenic(IV). A Pulse-Radiolysis Study." @default.
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- W2950836422 doi "https://doi.org/10.1002/chin.198944021" @default.
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