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Ion exchange resins have different affinities for different ions in the solution and exhibit selectivity in their adsorption. Different ions are subject to different resin exchange adsorption effects, and their strength follows a general pattern, but different resins may have slight differences. The main pattern is as follows: high valence ions are usually preferentially adsorbed, while low valence ions have weaker adsorption. Among ions of the same valence, ions with larger diameters are more strongly adsorbed.