Abstract
Abstract The volume of wet ES 28 and C 25 sulfonic ion exchange resin beads was determined by pycnometry for the H+, Na+, and K+ foms in water, and the relative volume variations were determined by precisely measuring the variations of the bed height in columns when the resins were converted from one ionic form to another. A straightforward correlation was found for the ES 28 resin for which the packing factor β remains sufficiently constant with double-sieved, sufficiently homogeneously dispersed beads. The variations of β have to be taken into account for C 25.
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