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This article in SSSAJ

  1. Vol. 22 No. 2, p. 99-103
    Received: Oct 21, 1957



The Density of Water Adsorbed by Lithium-, Sodium-, and Potassium-Bentonite1

  1. Duwayne M. Anderson and
  2. Philip F. Low2



A clay-water paste was compressed between a porous filter and a column of mercury and, by means of capillaries, the change in volume of the paste and the volume of water forced through the filter were observed simultaneously. From these observations a plot was made of the volume of the clay-water paste against the weight of water in the paste. The slope of the line at any water content is the reciprocal of the density of the last increment of water.

By this method, it was found that the density decreased continuously as the clay surface was approached. At distances of about 10Å, the densities of the water on lithium, sodium, and potassium bentonites were 0.975, 0.972 and 0.981, respectively. Thus, the adsorbed water is less dense than free water.

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