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USSR The theoretical foundations and applications of "mixed" adsorbents for the separation and concentration of metal ions are considered. "Mixed" adsorbents are defined as those containing two or more kinds of functional groups (with different donor sets) in a controlled proportion. Varying the proportion allows one to easily regulate the affinity of the stationary phase to metals. Experiments were carried out with the use of reversed-phase thin-layer chromatography (silica plates weredoi:10.2116/analsci.6.863 fatcat:xt5iljvxxzcv5fj36jqfqg2udi