| Autor: |
Read, John F., Bewick, Sharon A., Donaher, Sandra C., Eelman, Melanie D., Oakey, Jan, Schaubel, Catherine, Nga Chiu Tam, Theriault, Annie, Watson, Keith J. |
| Předmět: |
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| Zdroj: |
Inorganic Reaction Mechanisms (De Gruyter); 2005, Vol. 5 Issue 4, p281-304, 24p |
| Abstrakt: |
The kinetics and mechanism of the oxidation of trithionate (S3042-) and pentathionate (S5O42-) ions by ferrate ions (FeO42-) were studied under pseudo first-order conditions. Trithionate was studied over the pH range 7.6 to 10.5 with initial concentrations in the range 1 to 12 mM, and pentathionate was studied over the pH range 7.7 to 9.0, with the same initial concentrations. In both cases the products were dithionate and Fe(III). Above a pH of 8.0 the proposed mechanism for trithionate involves reaction between protonated ferrate and trithionate as the rate- determining step with a rate constant of 2.9 M-1s-1. For pentathionate above a pH of 8.4, the proposed rate-determining step involves unprotonated ferrate, with a rate constant of 3.3M-1s-1. At lower pH values both thiosalts show a direct dependence on the hydrogen ion concentration, but increased hydrolysis complicates the interpretation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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