Group separation of trace rare-earth elements by countercurrent chromatography for their determination in high-purity calcium chloride |
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Authors: | Ignatova S N Maryutina T A Spivakov BYa Karandashev V K |
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Institution: | Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow. |
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Abstract: | A method has been developed for the separation of the entire group of rare-earth elements from high-purity calcium chloride by countercurrent chromatography, and subsequent determination of the elements by ICP-MS. A solution of diphenyldibutylcarbamoylmethyl]phosphine oxide in chloroform (0.5 mol L(-1)) has been chosen as reagent for the extraction and preconcentration of trace rare-earth elements from aqueous 5% CaCl2 solution, 3 mol L(-1) in HNO3 and 0.1 mol L(-1) in HClO4. The analytes are back-extracted into a small volume of water and the aqueous eluate is subjected to ICP-MS measurements. The performance characteristics of the procedure developed have been checked by use of the standard addition technique and a real CaCl2 sample (Merck product) has been analyzed. The results obtained demonstrate the applicability of countercurrent chromatography to the determination of ultratrace elements. |
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