Planar electrochromatography on silica and alumina

Electrochromatography is one of the newest chromatographic methods. This pa per reports an evaluation of thin-layer electrochromatography on silica gel and aluminum oxide, two of the most popular adsorbents, with a strong homo genous electric field and the monocomponent organic mobile phases usually u sed in adsorption chromatography, The electric field influenced the migrati on velocity of mobile phases and the chromatographic parameters of chromato graphed substances. The influence was greater on the cathode side than on t he anode side, with the result that mobile phases and chromatographed subst ances migrated faster on the anode side than on the cathode side. The diffe rences were not great for weak and strongly polar solvents. The influence o f an homogenous electric field on the migration velocity of the mobile phas e and the chromatographed substances on the cathode side was most evident f or ethyl methyl ketone and ethyl acetate.