Abstract

                                Clay fractions were separated from representative black, red, alluvial and laterite soils. Various cationic clays were prepared and ion exchange experiments were condu- cted by equilibrating the clay salts with chloride solutions of the cations. After the attainment of equilibrium. the cations remaining in solution ware estimated. The por centage of cation exchanged increased as the concentration of the replacing cation in- creased upto 2 to 3 symmetry and then there was a definite decrease. This trend, however, varied with soil type. clay salts and electrolytes used. NaCl as the replacing cation showed very poor exchange, whereas maximum exchange was observed with CaCl2.

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