Dynamic ion-exchange chromatography with post-column reaction detection for the determination of the rare earth elements in monazites |
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Authors: | R Kuroda M Adachi K Oguma Y Sato |
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Institution: | (1) Laboratory for Analytical Chemistry, Faculty of Engineering, University of Chiba, Yayoi-cho, Chiba, Japan |
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Abstract: | Summary Separation and determination of lanthanum, cerium, praseodymium, neodymium and samarium in monazites have been achieved by
dynamic ion-exchange chromatography. The ore samples are decomposed by sulfuric acid and the rare earths are separated in
a group as oxalates. The rare earth elements are then separated from each other on a column of bonded phase silica by gradient
elution with 0.05 to 0.5 M lactic acid (pH 3.5) in the presence of 0.01 M sodium 1-octanesulfonate. Post-column reaction with
Arsenazo III is used for detection and quantification of the individual rare earth elements. Results are quoted for lanthanum,
cerium, praseodymium, neodymium and samarium in monazites. Detection limit is 1 μg ml−1 with a S/N ratio of 3. The separation is complete within 27 min valley to valley resolution. Precision of better than 1%
can usually be obtained. |
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Keywords: | Column liquid chromatography Ion-exchange Rare earths Monazite analysis |
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