Summary
A column with alumina of activity level I (according to H. Brockmann) can be inactivated by injecting the appropriate quantity of water with an air flow, so that its activity continuously increases from the lowest level V to the originan level I. Such columns permit separations of nonpolar fluids in an extended range and with fairly sharp zones.
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Diplomarbeit, Univ. Erlangen-Nürnberg, 1957
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Hesse, G., Roscher, G. Über die Herstellung einer Aluminiumoxidsäule mit stetig zunehmender Aktivität. Chromatographia 2, 512–514 (1969). https://doi.org/10.1007/BF02261259
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DOI: https://doi.org/10.1007/BF02261259