カルボキシメチルセルロース-硝酸ナトリウム水溶液系における希土類元素の薄層クロマトグラフィーとイットリウムの分離

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The adsorption behavior of all the rare earths, except for promethium, was surveyed on carboxymethyl cellulose thin layers in sodium nitrate solutions as a function of the concentration of salt. At lower salt concentrations, the R_f values of the lanthanoids showed an S-shaped variation with their atomic number, and yttrium lay near to lanthanum, relatively analogous to the adsorption behavior in chloride solutions. At higher salt concentrations, the behavior of the metals was considerably different from that in the chloride solutions, and the R_f values of the lanthanoids decreased with an increase of their atomic number. The R_f value of yttrium gradually approached that of europium with increasing salt concentration in nitrate media. Two-dimensional development appeared first with a 0.5 M sodium chloride solution and second with a 5 M sodium nitrate solution, allowing yttrium to be separated from all of the rare earths.
2004-11-05