Liquid-liquid extraction of Hf(IV) from nitric acid with dibutylsulfoxide in cyclohexane
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M. Haleem Khan
Summary
A liquid-liquid extraction method has been investigated for quantitative extraction of hafnium from 8 M HNO3 using 50% di-n-butyl sulfoxide (DBSO) dissolved in cyclohexane. The extraction parameters such as nitric acid, DBSO and metal ion concentrations, equilibration time and temperature were optimized. The extraction was found to be independent of metal ion concentration in the range 4.5 × 10−4 −4.5 × 10−2 M and inversely dependent upon the temperature. Phosphate, fluoride and oxalate interfere seriously and have almost masked the extraction of Hf(IV) whereas, thiocyanate and bromide have greatly decreased (25–34%) the extraction. The stoichiometric composition of the extracted species was found to be Hf(NO3)4·2DBSO. Hafnium can be stripped from the organic phase by using 1 M HClO4. The proposed method allows the mutual separation of Hf(IV) and Zr(IV) using H2O2 as masking agent for zirconium. The method has also been applied on synthetic mixtures of Hf and Zr for their separation and, the recovery was found to be quantitative.
© Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Production routes of the alpha emitting 149Tb for medical application
- Selective dissolution of Am in basic media in the presence of ferricyanide ions: a mechanistic and structural study on Am(V) and Am(VI) compounds
- The kinetics and mechanism of the reduction of neptunium (VI) ions by uranium (IV) ions in nitric acid
- Determination of 237Np at trace level: evaluation of various analytical procedures
- Preparation of U(VI) and Th(IV) α-sources from calcium nitrate solutions by combining solvent extraction and electrodeposition procedures
- Immobilization of actinide ions in thin layers of polypyrrole/polyacrylamidoglycolic acid (PPy/PAGA) composite. Application to the preparation of alpha spectrometry sources
- Separation and purification of Th from U by ammonium molybdophosphate from nitric solutions
- Complexation and luminescence spectroscopic studies of europium(III) with polymaleic acid
- Liquid-liquid extraction of Hf(IV) from nitric acid with dibutylsulfoxide in cyclohexane
- Multitracer study on the uptake mechanism of yttrium and rare earth elements by autumn fern
