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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

A study on the Determination and Solvent Extraction Efficiencies of Rare Earth Elements by TBP and Nitrate Salt

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.2, pp.103-108
Lee, Jung Min
Lee, Yong Ju
Kim, Sook Young
Kim, Young Man
Choi, Beom Suk
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Abstract

Rare earth elements(REE) were separated by solvent extraction with tri-n-butyl phosphate(TBP) and <TEX>$NaNO_3$</TEX>, followed by back extraction with water. The method was applied to the determination of REE to circumvent the spectral interferences of ICP-AES analysis. The effects of the <TEX>$NaNO_3$</TEX> concentration and the addition of hydrophobic solvents on the extraction efficiencies were investigated. Increases of the <TEX>$NaNO_3$</TEX> concentration enhanced the extraction efficiencies of REE, and more than 95% recoveries were obtained at 5M of <TEX>$NaNO_3$</TEX> concentration. On the other hand, addition of hydrophobic solvents lowered the extraction efficiencies. The method was applied to determine the REE in the monazite sample. But the precisions of the analytical results were more than 20%.

keywords
monazite, rare earth elements, tri-n-butyl phosphate, solvent extraction


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