FIELD: analytical methods. SUBSTANCE: optically thin submicron film of selective ion-exchange material (or chelate) is formed on smooth surface of a substrate. Investigated solution is brought in contact with the film for a specified time and remains of solution are removed. The thus prepared film is subjected to primary monochromatized radiation within specified spectral range. Desired signal is registered by X-ray- fluorescent spectrometer and element composition is calculated. EFFECT: increased reliability of analysis. 4 cl, 1 dwg
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