Adsorption of I~ ions on natural cinnabars, whose localities are Spain, USA, and Mexico, have been studied by batch method. Only Spain cinnabar (S-cinnabar) was found to have relatively high adsorptivity to I ions even in the presence of Cl~ ions. The value of distribution ratio (Kd) is 10 3 ml/g under the conditions of initial [I"] = 1.0X10" 6 M (1 Μ = 1 mol/dm 3 ), pH = 6.0, and solution/S-cinnabar = 100 ml/g. It was found that the adsorptivities of S-cinnabar to I" ions increase with an increase in the specific surface area and a decrease in pH, that the adsorption of Γ ions on S-cinnabar is irreversible, and that S-cinnabars heated at temperatures higher than 100°C decrease the adsorptivities to Γ ions. Furthermore, I" ions were found to be not adsorbed on HgS reagent which is the main component of cinnabar. From these results, the adsorption of I" ions on S-cinnabar is considered to be due to the reaction between I" ions and certain species in the surface, which are thermally unstable and minor component.
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