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The effects of temperature and retaining ion on the separation factor (α) and distribution ratio (D) of some lanthanides (Pr3+, Nd3+, Sm3+ and Er3+) have been studied in the EDTA solution as an elutant by using Amberite IR 120 + resin. The retaining ions on the resin were NH4+, Na+, K+, Mg2+, Ca2+, Zn2+ and Ce3+. Separation factor of Nd/Pr is much improved by using Ce3+ as retaining ion. The distribution ratios were decreased with the increase of temperature, but separation factors did not always increase with the increase of temperature. However, in the case of Ce3+ as retaining ion, separation factors of Nd/Pr and Sm/Nd were increased with the increasing of temperature. And also in the case of Zn2+ as retaining ion, separation factor of Er/Sm was increased with the increasing of temperature.
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