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Smectites are the most commonly found clay mineral in many temperate region soils. It exhibits variability in shrink – swell behavior and sorption of organic molecules. Previous research has established the relationship between extent of swelling and sorption of organic compounds by smectites. The effect of the interlayer cation on sorption of organic compounds and the inter-relationship between cation exchange selectivity and extent of swelling has also been demonstrated. We investigated the effect of sorption of an organic compound on cation exchange selectivity and the interaction between organic sorption, cation exchange, and clay swelling. Our hypothesis was that adsorption of organic molecules in the interlayers of smectite influences the affinity of the clay for inorganic cations in aqueous systems. Caand Ksaturated SPV (bentonite) and SAz-1 were equilibrated with mixed salt solutions containing 0.01 M KCl and 0.005 M CaCl2 in the presence or absence of 200 ppm m-dinitrobenzene (DNB). Concentrations of Ca and K in solution and on the clay and concentrations of m-DNB were measured. The clay suspensions, both with and without the m-DNB, were also analyzed on the x-ray diffractometer to study the clay structure and the d-spacing. In general, SPV that was initially saturated with Ca sorbed more m-DNB than the SPV that was initially saturated with K. In general, the SPV sorbed more m-DNB than the SAz-1. Sorption of m-DNB on SPV increased preference for K relative to Ca for samples initially saturated with Ca, but it had little effect on exchange selectivity for samples that

Interaction of m-Dinitrobenzene (DNB) with Calcium and Potassium saturated reference smectites in aqueous suspensions