A Sorbent Based on Prefilter Resin Impregnated with 2-Ethylhexyl Hydrogen 2-Ethylhexylphosphonate for Extraction-Chromatographic Separation of Lanthanides

The characteristics of an extraction-chromatographic sorbent for lanthanide separation, prepared by impregnation of Prefilter resin with 2-ethylhexyl hydrogen 2-ethylhexylphosphonate, were studied. As demonstrated by the example of the Yb/Lu separation, in sorption from nitric acid solutions ([HNO₃] < 4 M) under batch conditions, the logarithm of the lanthanide distribution ratio is a linear function of the solution acidity. In column experiments, the flow rate of the mobile phase exerts the strong influence on the Yb/Lu separation efficiency. The temperature and sorbent particle size exert weaker influence. The characteristics of the suggested sorbent are identical to those of its analog, LN2 sorbent (EiChrom, USA). The sorbent based on Prefilter resin ensures lower, compared to LN2, extractant leaching.