Experiment on the adsorption of a ealcium-sodium-humate (Ca-Na-HA, Ca2+: Na+; 3.5:3.4 in molar ratio=HA(D')) on a Ca-montmorillonite (Ca-Mt) was conducted to analyze the process of adsorption of HA on Ca clays. The adsorption experiment was carried out in solution under conditions whereby a constant (minimum) HA(D') molecular size was maintained in the dissolved state. The saturated adsorption amo'unt of the HA(D') monomolecular layer was 20-38 g kg -1 at pH 6-7 and in a NaC1 concentration range of 0.004-0.028 M. It was concluded that HA(D') adsorption only takes place on the Ca-Mt edge (E)-surface, because the relations of the adsorption amount vs. pH corresponded to the variation in the electrical potential with the pH of the E-surfaces, and the adsorption amount and the characteristics of these adsorption curves were similar to those of the Na-HA adsorption on Na-Mt.
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