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REE determinations were conducted for two mineralized lakes of the Ishim steppe, situated between the Irtysh and Tobol rivers in the southern part of Western Siberia, by means of atomic absorption spectrometry (AAS). They are of Cl-Na-type but differ in salinity and pH. It was shown that REE distribution patterns for the Zhamantuz and Kishikaroy lake waters were identical. Nevertheless, coherent fractionation from LREE to HREE is disrupted after the equilibrium calculations. Thermodynamic modeling was performed wi...