科研之友
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摘要
The distribution coefficients, K-d 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 Tb(NO3)(4) with Ar-40 ion beam. The effects of pH and fulvic acid on the K-d values of 36 elements were studied. It was found that the sequences of the K-d 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 formation and hydration. Various effects of pH and the negative or positive effect of FA on the adsorption of 36 elements were observed and are probably related to the species of 36 elements in the aqueous solutions containing CO32-, 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.
- 出版日期2001-12
- 单位兰州大学
