It is shown that strongly basic anion exchangers AV-17 and Varion-AD in definite conditions are able to retain Cr(III)-containing ions from Cr(III) sulfate solution. It is found that the sorption of Cr(III)-containing ions on the polymers is essentially dependent on the pH, temperature, and Cr(III) sulfate concentration. The maximum temperature dependence of sorption was found to be about 608C. The sorption isotherms are well described by Langmuir's equations. The sorption kinetics is determined by the diffusion of Cr(III)-containing ions into polymer's phase. It is assumed that the Cr(III)-containing ions are retained through formation, in polymer's phase, of the jarosite-type mineral compounds: R 4 N[Cr 3 (OH)

No abstract

The sorption and partial destruction of the Fe(III)-containing compounds in the aqueous medium in strongly basic anion exchangers AV-17 and Varion-AD phase have been investigated. It is shown that partial destruction of the Fe (III) compounds in acidulated water (pH 5 2) and in K 2 SO 4 , Fe 2 (SO 4 ) 3 solutions takes place. With increasing of temperature up to 508C, the desorption degree of the iron ions from polymer phase decreases. In dried polymer, the structural and electronic state of iron compounds, according to their magnetic susceptibility, remains stable for a long time. The sorption of the Fe(III)-containing cations at 508C during 12 h depends essentially on the sizes of polymer granules. Sorption increases with growing of polymer granules. For comparison of sorptional capacities, the sorption of Fe(III)-containing cations was determined on different cation and anion exchangers.