二酸化マンガン水和物によるインジウムの共沈捕集

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The carrier precipitation of μgmg range of indium in 25ml of diluted nitric acid (<0.1N) with hydrated manganese dioxide has been studied using In-114m as a tracer, and the results were discussed by assuming the adsorption of indium on a surface of the collector. The μgmg range of indium in 25ml of solution was almost completely coprecipitated with 27.5mg of manganese carrier. The carried-down percentage of indium decreased effectively by the elevation of initial concentration of indium above 2mg/25ml following the Freundlich's isotherm: log (In)ad=log k+1/n log (In)ini, where k and n are constants. The amounts of the carrier also showed the effect on the entrained percentage of indium according to the equation: log (In)ad=a log (Mn-Mn0)+log b, where (Mn-Mn0) denotes the quantities of precipitated manganese and a, b are constants. The presence of more than 10-6mol/l of EDTA, 0.1mol/l of H+, 10-4mol/l of Pb2+ or 10-4mol/l of Fe3+ diminishes the recovery of μg quantities of indium.
社団法人日本分析化学会の論文