Cation Replacement Studies on Heteroionic Bentonitic Clay Fractions Using Specific Ion Glass Electrodes

Walter Fertl and F. W. Jessen
Department of Petroleum Engineering, The University of Texas, Austin, Texas

Abstract: Centrifuged fractions, ranging in size from 2·0 to 0·05 µ of a Wyoming bentonite, Bentonita de Durango from Mexico, and Helms clay from Texas were studied. The variation in replacement of Na+, Ca2+, Mg2+, K+, and H+ from these heteroionic clay systems under specific equilibrium conditions of salt concentrations was measured.

The displacement cation distribution was monitored by using specific ion glass electrodes, such as a sodium ion electrode, a cationic glass electrode, a calcium ion electrode and a Tektite electrode. Some factors affecting the exchange reactions are discussed and application of findings to drilling and production techniques is indicated.

Clays and Clay Minerals; May 1969 v. 17; no. 1; p. 1-8; DOI: 10.1346/CCMN.1969.0170102
© 1969 The Clay Minerals Society
Clay Minerals Society (www.clays.org)