Abstract
A survey is given of the methods for determining the size of agglomerates in suspensions. Counting methods, photometric methods, and sedimentation methods are most frequently used. With the latter two methods, the agglomerate size can only be determined if the porosity of the agglomerates is known. The mean size and the mean porosity of agglomerates in suspensions can be determined by the simultaneous measurement of the specific extinction cross-section area by means of a photometer, and the mean settling velocity by means of a sedimentation balance. As shown for suspension of quartz in water with NaCl or a cationic polyelectrolyte as agglomerating agent, the porosity of the agglomerates increases with increasing agglomerate size.
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