[en] Conditions for americium and curium isolation on the KU-2-8 cation exchanger with grain size of 0.15-0.25 mm from hydrochloric and nitric acid solutions with concentration of 0.1-6 mol/l and purification from macrosalts and interfering alpha-emitters were investigated. The studies were carrier out using saltless solutions and solutions of environmental samples with introduction of americium-241 and curium-244 into them. It is ascertained that on the KU-2 americium and curium in saltless solutions behave like hydrochloric and nitric acid media. The values of purification coefficients from alpha-emitters: plutonium, uranium, neptunium, thorium, rodium, polonium and the values of americium and curium in the process of analysis of environmental samples of the mass up to 50 g are determined