The Influence of Oxalate on Fe-Catalyzed S(IV) Oxidation by Oxygen in Aqueous Solution |
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| Authors: | A Wolf F Deutsch P Hoffmann H M Ortner |
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| Institution: | (1) Fachbereich Materialwissenschaft, Fachgebiet Chemische Analytik, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany |
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| Abstract: | This study demonstrates that oxalate has a strong inhibiting effect onFe-catalyzed S(IV) oxidation by oxygen in aqueous solution. While thepseudo-first order rate constant of S(IV) oxidation was determined to be1.6 × 103 M-1 s-1 in experimentswithout oxalate, the oxidation of S(IV) was totally inhibited at a molarconcentration ratio of iron:oxalate = 1:5 at an oxalate concentration of 4 M. Under these conditions, the Fe(II)/Fe(III) ratio remained nearlyconstant during the observed reaction time. The determined rate constants wereindependent of the initial oxidation state of iron. However, with increasingconcentrations of oxalate, a longer induction period is observed forexperiments with iron initially in the Fe(II) oxidation state. |
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| Keywords: | atmospheric chemistry S(IV) oxidation iron oxalate inhibition speciation |
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