Abstract
The influence of exchangeable cations on montmorillonite, illite, and kaolinite and of lattice charge of montmorillonite on clay-humic acid complexation were studied with complexes which were subjected to drying. The amounts of humic acid (HA) nonextractable by water from the complexes (termed “fixed” humic acid) were determined. The fixation of HA by montmorillonite followed the order Li+
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