Oxidation of Sb(III) to Sb(V) by O2 and H2O2 in aqueous solutions |
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| Authors: | Ann-Kathrin Leuz C Annette Johnson |
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| Institution: | a Swiss Federal Institute for Environmental Science and Technology (EAWAG), Postfach 611, CH-8600 Dübendorf, Switzerland |
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| Abstract: | The rates of Sb(III) oxidation by O2 and H2O2 were determined in homogeneous aqueous solutions. Above pH 10, the oxidation reaction of Sb(III) with O2 was first order with respect to the Sb(III) concentration and inversely proportional to the H+ concentrations at a constant O2 content of 0.22 × 10−3 M. Pseudo-first-order rate coefficients, kobs, ranged from 3.5 × 10−8 s−1 to 2.5 × 10−6 s−1 at pH values between 10.9 and 12.9. The relationship between kobs and pH was: |
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