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This article in SSSAJ

  1. Vol. 24 No. 4, p. 261-264
    Received: Dec 16, 1959
    Accepted: Jan 15, 1960

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Activity Measurements in Water and Clay-Water Systems With Tertiary Electrodes1

  1. Goro Uehara and
  2. M. M. Mortland2



A tertiary amalgam electrode was utilized in the measurement of CaCl2 and Ca++ activities. Activity coefficients from electromotive force data compared favorably with those in the literature. The relative influence of various metal ion salts on the CaCl2 and Ca++ activities followed the sequence Rb ≥ Mg > K > Na > Li for both kaolinite and Wyoming bentonite. The activities of CaCl2 and Ca++ in bentonite-kaolinite mixtures differed from predicted activity values based on pure clay systems.

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