Abstract
The distribution coefficients, Kd of 36 elements from Na to Bi on a silica were determined at pH 4, 7, 9 and in the absence and presence of fulvic acid (FA) using a multitracer technique. The multitracer solution was prepared by irradiation of Th(NO 3)4 with 40 Ar ion beam. The effects of pH and fulvic acid on the Kd values of 36 elements were studied. It was found that the sequences of the Kd values of alkali elements (Cs>Rb>K>Na) and of alkaline earth elements (Ba>Ca>Mg) in the absence of FA can be qualitatively explained in terms of chemical bond formati on and hydration. Various effects of pH and the negative or positive effect of FA on the adsorption of 36 elements were observed and a re probably related to the species of 36 elements in the aqueous solutions containing CO 3 2– , OH – , Cl – and FA. For most of the elements studied here the Kd values are increased with increasing pH and are decreased with adding FA.
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