Determination of osmium by the sorption-X-ray fluorescence technique

Sorption of osmium(IV, VI) on complexing sorbents POLYORGS XXIV, POLYORGS 3 2 M, and POLYORGS 32 V and on the PVA-PGMA-PEPA sorbent from alkaline and h ydrochloric acid solutions is studied. It is demonstrated that equilibrium in systems under study is attained within 40 min for the POLYORGS XXIV sorb ent and within 2.5 h for the POLYORGS 32 V sorbent and that the sorbents ex hibit a sufficiently high sorptive capacity with respect to osmium: from 3. 4 to 8 mg of Os(VI) in alkaline solutions and 2.2 mg of Os(IV) in acidic so lutions. Optimal conditions of analysis of a concentrate on an EDX-771 ener gy-dispersive X-ray fluorescence spectrometer are revealed and, on this bas is, a sorption-X-ray fluorescence method that provides the determination of osmium in a wide concentration range with the detection limit down to 10(- 6)% is developed.