Abstract
The photochemical behavior of mercury ore (cinnabar) in water was studied using a blacklight lamp as a substitute of sunlight. The mercury ore was photosolubilized in water as mercuric ion, and metallic mercury was then volatilized from the aqueous suspension of mercury ore by photoirradiation. The photosolubilization of the mercury ore and the mercury volatilization were enhanced by the presence of an electrolyte in suspension. From the results of chemical analysis of the aqueous suspension after the photoirradiation, it appears that the mercury sulfide in the ore is dissociated into mercuric ions and free sulfur in water by photoexcitation, and hence mercury ore is solubilized into water. Furthermore, the oxidation of the free sulfur into sulfate ions via polythionic acid results in the reduction of mercuric ions to metallic mercury; hence, the metallic mercury is volatilized.
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