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The photochemical reaction of mercuric sulfide was studied in aqueous solutions. The photo‐solubilization of mercuric sulfide occurred under irradiation with light of ≤650nm and was enhanced in the presence of oxygen and electrolytes. The resultant mercuric ions were easily methylated in the presence of acetate ions via the photosensitized reaction by the simultaneously produced “photo‐sulfur” under irradiation with light of ≤420nm. The photoelectrochemical studies of mercuric sulfide electrode revealed that black mercuric sulfide was an n‐type semiconductor and the photo‐current due to the dissolution as mercuric ions was observed on anodic polarization. The photo‐solubilization of mercuric sulfide may be interpreted in terms of the local‐cell mechanism.
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Akagi et al. (1977) studied this question.
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