Abstract
The kinetic characteristics of the oxidation of iron monosulfide with molecular oxygen and hydrogen peroxide in a neutral aqueous medium were studied. The rate of oxidation of FeS with oxygen was proportional to the concentration of O2 and quadratically depended on the initial concentration of FeS, W 0 = k ef [FeS]2[O2], where k ef = (2.5 ± 0.5) × 105 M−2 s−1 (pH 8, 22°C). During the oxidation of FeS, the iron ion retained the valence state +2. Oxidation products contained about 50% elemental sulfur. The interaction of FeS with H2O2 was characterized by the half-time of reaction less than 15 s. The products of oxidation of initially nontoxic FeS contained toxic compounds, supposedly the sulfoxylate ion HS 2 − .
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