Abstract
Paper and thin-layer chromatography—which generally give analogous results—have been carried out in HNO 3, HBr, HI, HSCN and HClO 4 systems, using supports impregnated with high-molecular-weight amines and substituted ammonium salts. Based on results previously obtained in the HCl system, 5–7 liquid anion-exchangers were investigated, using approx. 10 cations for each acid system. The HBr and HI systems generally give results comparable to those found with HCl as an eluant. A more divergent picture is shown by HSCN, with which eluant it is preferable to use paper chromatography for the time being. The HNO 3 system shows fairly low adsorption for most ions, but some interesting applications are outlined. Results with HClO 4, on the other hand, are not particularly successful. The use of HI and HBr solutions containing some free I 2 and Br 2, respectively, has no unfavourable effects. The R F spectra in the HBr and HNO 3 systems show good agreement with literature data on solid anion-exchangers. Most curves may be explained assuming an anion-exchange mechanism, adsorption to the support being important incidentally. The adsorption sequence previously reported for the liquid anion-exchangers appears to be reliable for general guidance.
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