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KMID : 0385520080210040272
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Analytical Science & Technology
2008 Volume.21 No. 4 p.272 ~ p.278
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A study on the separation and determination of the rare earth Elements by the AG® 50W-X8 cation exchange resin
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Lee Jung-Sook
Choi Beom-Suk
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Abstract
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Methods to separate 14 rare earth elements (REEs) and yttrium by the AG® 50W-X8 cation exchange resin, and to determine REEs by inductively coupled plasma atomic emission spectrophotometry (ICP-AES) were described. Ion exchange capacities of REEs on the resin were so high that the REEs were quantitatively ion exchanged under the flow rate of 0.3~1.0 mL/min at pH 1~6. The breakthrough capacity curve of the REEs showed that ion exchange capacities of light REEs (Cerium group) were greater than that of the heavy REEs (Yttrium group). When 200 ㎍ of each REEs was ion exchanged on 100 ㎎ of resin, most of the heavy REEs were quantitatively desorbed with 10 mL of 2.0 M of HNO₃, while most of the light REEs with 30 mL. The method was applied to the monazite sample. The REEs could be separated from matrix, since ion exchange capacities of matrix ions of Ca, Ti, Mg, Mn were much lower than that of the REEs. However the relative standard deviations of the analytical results by the present method were not improved, as high as 1~5%.
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KEYWORD
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rare earth elements, monazite, AG® 50W-X8 ion exchange resin
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