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Abstract
The samples of mixed Mn-M oxides (M-transition metal) were synthesized by redox reaction of KMnO4 and MnSO4 in the presence of Co2+ and Fe2+ cations. Co3+ and Fe3+ ions, having similar ionic radii to Mn3+, were incorporated into MnO2 structure and were not removed even by concentrated HNO3 solution. Mixed oxides exhibit higher affinity for heavy alkaline earth ions (Ba2+ and Ra2+) than α-MnO2 and lower selectivity for alkali metal cations. The separation factor for Ra-Ba pair on mixed oxides is much higher than on α-MnO2 and cation exchange resins. The obtained α-MnO2 samples can be used for the determination of 226,228Ra in natural water containing significant amounts of potassium and barium salts.
ACKNOWLEDGMENT
We are grateful to Dr. Robert Delmas from Pierre Süe laboratory, C.E.N Saclay, France for activation analysis of the samples.
