METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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SORPTION OF U(VI) BY SUBMICRON ZnS PARTICLES FROM AQUEOUS SOLUTION

A.P. KRASNOPYOROVA, K.N. BELIKOV, D.S. SOFRONOV, A.V. BULGAKOVA, A.Yu. RUBAILO

 Sphalerite ZnS powder with the size of particles of 100-200 nm was obtained using the method of chemical deposition from thiourea solutions. Sorption properties of ZnS towards U(VI) within pH range of 2-9 are studied in batch experiments at 25°C using the method of limited volume. The residual concentration of U(VI) in solutions after sorption was determined by a luminescent method. It was found that sorption equilibrium in the studied system at рН 7 is established during 60-90 min. Recovery rate of U(VI) in the range of pH 4-9 was 95-99 %. Fine-dispersed ZnS can be used as a component of sorption-scintillation materials for determination of low contents of radioactive uranium in natural waters.

Key words: U(VI), sorption, ZnS particles, fluorimetry