Electroosmosis can be conveniently used to assess the electrokinetic p
otential of granular matter compressed in a plug. The method is based
on measuring the flux of the surrounding solution through a capillary
tube. A procedure is described that accounts for the pressure drop acr
oss the capillary which, if neglected, may affect the results of the e
lectroosmotic measurements. (C) 1996 Academic Press, Inc.