Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 26, 2016
Previous Article Next Article

Pre-concentration of Ta(V) by solvent extraction before determination of trace amounts of Ta in Nb and Nb compounds

Author affiliations

Abstract

The paper presents the results of a study on the efficiency of the separation of Ta(V) and Nb(V) from fluoride solutions by solvent extraction with methyl isobutyl ketone with a view to applying the extraction process to the purification of Nb from Ta and for the pre-concentration of Ta prior to its determination in Nb and its compounds over a wide range of initial concentrations. With strict control of the hydrofluoric acid concentration and the re-extraction of Ta into an aqueous phase using an ammonium oxalate solution, the mean recovery factors [R with combining macron][%] for Ta were 94–108% in the initial weight ratio mNb : mTa = (ρNb/Ta) range 10–1 000 000 with only a small scatter about the mean value (RSD ≤ 6%), with the exception of (ρNb/Ta) = 1 000 000. The effect of the composition of the re-extraction solution on the excitation conditions of Ta in ICP-OES (ICP-MS) plasma was negligible and small amounts of Nb and other contaminants co-extracted with Ta did not affect its determination.

Graphical abstract: Pre-concentration of Ta(V) by solvent extraction before determination of trace amounts of Ta in Nb and Nb compounds

Back to tab navigation

Article information


Submitted
26 Apr 2016
Accepted
29 May 2016
First published
01 Jun 2016

Anal. Methods, 2016,8, 5304-5310
Article type
Paper

Pre-concentration of Ta(V) by solvent extraction before determination of trace amounts of Ta in Nb and Nb compounds

M. Turkowska and M. Smolik, Anal. Methods, 2016, 8, 5304
DOI: 10.1039/C6AY01231K

Social activity

Search articles by author

Spotlight

Advertisements