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Extraction of indium(III) from sulfuric acid solutions with di-2-ethylhexyl hydrogen phosphate and isododecylphosphethanic and diisooctylphosphinic acids was studied. The effect of H 2 SO 4 and In(III) concentrations in the aqueous phase, type and concentration of the extractant in the organic phase, temperature, and time of phase contact on the extraction of In(III) and impurity metal ions was considered. The In(III) extraction constants were estimated.