Abstract
Gas-solid and liquid-solid chromatography have been performed on chromia layers bonded to silica gel 62 and to LiChrosorb Si 100, 10 μm, respectively. Compared to gas chromatography on plain silica gel 62, aliphatics are much stronger, aromatics much less retained on the chromia layers. There occurs a peculiar cross-over between homologous series: 1-olefins are less retained at low, but more retained at high molecular weight than are 2-olefins. When Carbowax 20M is “bonded” to the chromia surface, this retention behaviour is somewhat moderated but remains still distinctly different from that of silica. LiChrosorb-supported chromia shows the same high efficiency as the bare silica gel in high-performance liquid chromatography, but differs in selectivity. Generally, chromia is more retentive than silica towards a variety of organic structures, but shows the opposite behavior towards free phenols.
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