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The diffusion coefficient values of In(III) in potassium chloride and potassium nitrate supporting electrolytes have been determined by polarography. Also, the half-wave potential, E 1/2 , and the |E 3/4 −E 1/4 | values have been calculated. The results show ionic strength and chloride concentration effects on electrode kinetics in the reduction of In(III).
Acid diffusion in the presence of hexamethyldisiloxane (HMDS) enables complete recovery of ionic fluoride from standards containing varying concentrations of aluminium as one of the main interfering ions. Acid diffusion without HMDS shows a decrease in fluoride recovery as aluminium ion concentration increases. The fluoride concentration in the trapping solution is determined directly on the diffusion...
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