Homogeneous liquid-liquid extraction method for some kinds of high-valence metal ions using desferrioxamine B.
Open Access
- 1 January 1997
- journal article
- Published by Japan Society for Analytical Chemistry in BUNSEKI KAGAKU
- Vol. 46 (1) , 55-58
- https://doi.org/10.2116/bunsekikagaku.46.55
Abstract
A homogeneous liquid-liquid extraction method of high-valence metal ions using desferrioxamine B (DFB) was studied. In a strongly acidic aqueous solution, DFB reacts and forms a 1:1 complex with Ti(IV), Zr(IV), V(V), Nb(V), Ta(V), Mo(VI) and W(VI) at room temperature. These metal-chelates were concentrated by a homogeneous liquid-liquid extraction method using perfluorooctanoic acid (HPFOA). Under the experimental conditions {[HPFOA]T=6.0×10-3 mol dm-3, [HCl]T=0.72 mol dm-3; [acetone]T=2.0 vol %} the volume of the sedimented phase was about 0.1 cm3 (500-fold concentration) and the extraction percentage of Ti(IV)-, Zr(IV)-, V(V)-, Nb(V)- and Ta(V)-chelates in the extraction procedure were 8398%. The concentration of metal ions in the sedimented phase was determined by X-ray fluorescence spectroscopy. The calibration curves of Ti(IV), Zr(IV), V(V), Nb(V) and Ta(V) were linear over the concentration range of the metal ions up to 2.0×10-6 mol dm-3. The relative standard deviation was below approximately 6% (5 determinations). The detection limits (S/N=3) were at 10-8 mol dm-3 levels, respectively. This method was applied to the simultaneous determination of Ti(IV), Zr(IV) and V(V) in a synthetic sample with satisfactory results.Keywords
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