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Electrochemical characterizations of high purity natural crystals of orpiment (As2S3) and realgar (As2S2) were performed in the presence of a bacteria-free, acidic bacterial growth medium for Thiobacillus ferrooxidans, name M2. A carbon-paste electrode (CPE), composed of a mixture of pure mineral grains with graphite powder and silicon oil as a binder, was used for the experiments. Reproducibility of the mineral surfaces was assured by monitoring the open-circuit potential (OCP) of the initial CPE-mineral-electrolyte interface. The voltammetric study revealed that the oxidation processes for both of these arsenic-bearing minerals involves two steps: an initial oxidation of the sulfide mineral to H3AsO3 and HSO4-, followed by the oxidation of H3AsO3 to H3AsO4. The reduction processes for the two minerals, however, differ. While the reduction of orpiment occurs in a dual step process, for realgar, the process is achieved in a single step.
Characterization; Crystals; Cyclic voltammetry; Electrochemical electrodes; Electrolytes; Interfaces (materials); Minerals; Optical microscopy; Oxidation; Carbon paste electrode; Electrochemical cell; Open circuit potential; Orpiment; Realgar; Electrochemistry
Electrochemical study of orpiment (As2S3) and realgar (As2S2) in acidic medium
Generically Dependent Continuant
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