Abstract
The preparation of spherical silica with sieve fractions between 5 and 35 μm is described. Permieabilities ( K) and relative peak broadenings ( h) have been determined experimentally to be a functionof the average particle size ( d p) of the narrow-sieve fractions ( h ??? d p 1.3). The average particle size can be calculated to a reasonable approximation from the permeability of the column packed by the balanced density method. Simple relationships are proposed for estimating the constants in the equation h = A + Cu as a function of d p . The maximum sample size is about 2·10 1 g of sample per gram of silica. Some consequences of the pressure limits in high-pressure liquid chromatography are discussed.
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