Abstract
The chromatographic behaviour of 48 metal ions on plain and stannic arsenate papers has been studied in DMSO/1 mol dm−3 HNO3 in (9∶1), (7∶3), (5∶5), (3∶7), and (1∶9) ratios and DMSO/8 mol dm−3 HNO3 in (7∶3) ratio. It has been found that for K(I), Rb(I), and Cs(T) Rf=KC1/2 where C is the nitric acid concentration. DMSO/8 mol dm−3 HNO3 (7∶3) is almost specific for In(III) and separates In(III) from Ga(III) and Al(III). Even on plain papers pure DMSO is a useful solvent which separates: Ca(II)−Mg(II), Sn(II)−Sb(III), Cd(II)−Zn(II), Mg(II)−Al(III), Be(II)−Mg(II) and TiO2+−VO2. A comparative study has been made of DMSO−HNO3 and butanol-HNO3 systems for K(II), Rb(I) and Cs(I).
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