Abstract
A sulfonated dithizone, disodium dithizonedisulfonate (DzS) was synthesized and immobilized on an anion-exchange resin. The DzS-loaded resin (DzS resin), which is prepared very easily, was confirmed to behave as a chelate-forming resin and to be useful for the collection of mercury(II), methylmercury, and silver(I). The collection of mercury(II) and silver(I) was complete in the pH range between 1.0 and 7.0, and that of methylmercury was complete in the pH range between 3.5 and 7.0. The uptake of cadmium(II) and zinc(II) was incomplete in the pH range between 1.0 and 7.0. The sorption capacities for mercury(II) and methylmercury increased proportionally with the amount of DzS immobilized on the anion-exchange resin. The mercury(II) sorbed was almost completely removed from the resin with concentrated mineral acids such as hydrochloric acid and nitric acid, and also with 10% thiourea. The anion-exchange resin was regenerated with acids, whereas the DzS resin was recovered with thiourea; both of them could be used repeatedly.
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