Measurement of the coefficient of calcium isotope separation in the system of calcium aqua complex-Ca2+ in the phase of the ANKB-50 ionite

Using the method of two-step exhaustion the coefficient of calcium isotope separation in the exchange system of calcium +n the phase of ANKB-50 ionite-Ca(H2O)62+ in water is measured. The precise mass-spectrometric analysis of isotope effects onb both steps of the exhaustion is carried out using the two-ray compensation method with an accuracy of recording of the difference in isotope ratios of the standard and sample +-0.06%. It is established that heavy isotopes of calcium are concentrated in the ionite. The separation coefficient for the pair of isotopes 44Ca-40Ca constituted 1.0041+-0.0004. On the basis of the analysis of the exchange processes, proceeding in ANKB-50, the possibility of the increase of α4044 in chelate-forming systems with iminodiacetate ligands up to 1.008 is shown