THE SEPARATION OF THE RARE EARTHS BY ION-EXCHANGE PROCEDURES

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Abstract
The iminodiacetic acids have been examined as possible complexing agents in the chromatographic separation of the rare earths with cation exchange resins. The ammonium salts of these acids form complex ions involving both one and two iminodiacetate ions of increasing stability with the rare earth elements of greater atomic number. Methods greatly reducing the time and material requirements are presented for the separation of the cerium group elements with nitrilotriacetic acid.