Abstract
The adsorption of nucleic acids by montmorillonite was found to be largely dependent on the pH of the system. Below pH 5 · 0 the adsorption was found to be of an internal nature and to increase with decreasing pH. Above pH 5·0 adsorption fell to a minimum and was confined to the external surfaces of the clay. The addition of electrolyte was found to increase adsorption at all pH values. The only difference found between RNA and DNA was that the former is more readily adsorbed internally from high concentrations. X-ray diffraction results suggested that adsorption produces a random interstratification of nucleic acid-expanded units and non-expanded units. The implications of these results in the degradation of nucleic acids in soils are discussed.
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