Abstract
CHANGES in dielectric constant, the measurement of which is quite non-destructive, have been employed for the detection of gas chromatographic bands while still in the adsorbed state1. The method involved the measurement of the change in capacity of a condenser the dielectric of which was either a portion of the column, or a finely divided carbon packing, on which the organic vapour was adsorbed. The technique used, though sensitive, involved the measurement of small changes in radio-frequency employing apparatus of some complexity.
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