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Soil Science Society of America Journal Abstract -

Infrared Study of Exchangeable Cation Hydration in Montmorillonite1


This article in SSSAJ

  1. Vol. 39 No. 6, p. 1095-1099
    Received: May 8, 1975
    Accepted: July 9, 1975

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  1. Garrison Sposito and
  2. Duwayne M. Anderson2



Infrared absorption spectra in the 3000 cm-1 and 1600 cm-1 regions are reported for thin films of Na-, K-, Li-, and Ca-Wyoming bentonite previously dehydrated over P2O5 and over LiCl · H2O at room temperature. The spectra of Na- and K-clay exhibited very similar features in the 3000–3500 cm-1 region, which, together with other data, lead to the proposal that the exchangeable cations on these montmorillonites are dehydrated at relative humidities less than about 11%. The spectra of Li- and Ca-clay are very different from those of Na- and K-clay. A sharp doublet structure appears to be centered near 3650 cm-1 and the absorption in the 3000–3500cm-1 region generally is much deeper and broader. These differences are interpreted as evidence of the hydration of the exchangeable cations Li+ and Ca2+ at relative humidities less than about 11%. The conclusions drawn here are in agreement with previous findings based on infrared, differential thermal analysis, and desorption isotherm studies.

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