Kinetics and mechanism of the reaction of hydrogen sulfide with lepidocrocite

The initial reaction between hydrogen sulfide and the surface of lepidocrocite was studied in the pH range between 4 and 8.6 by monitoring the change of the emf of a pH 2 S sensor. The rate of H 2 S oxidation is pseudo first order with respect to H 2 S and shows a strong pH dependence with a maximum at pH 7.