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This article in SSSAJ

  1. Vol. 31 No. 3, p. 361-365
    Received: Oct 9, 1966
    Accepted: Dec 15, 1966

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Cation Exchange Reactions of Soil and Specimen Vermiculites1

  1. J. D. Rhoades2



Magnesium-calcium and sodium-calcium ion-exchange isotherms and potassium-sorption properties were determined for two vermiculitic materials isolated from soils as well as for three specimen vermiculites and four montmorillonitic materials. The soil vermiculites differed considerably from the specimen vermiculites in their ion-exchange and K-sorption properties. The soil vermiculites did not demonstrate the strong preference for Mg over Ca, the tendency to form interstratified layers upon K-sorption, as marked a temperature dependence in their exchangeable sodium ratio—sodium absorption ratio (ESR-SAR) relations, or as great an affinity for Na as was observed for specimen vermiculites. Their behavior deviated considerably from the ESR-SAR relation commonly used as a reference for Na-Ca, Mg exchange in soils. Soil montmorillonites, on the other hand, reacted the same as specimen montmorillonites in the ion-exchange reactions studied and followed the usual ESR-SAR relation quite closely.

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