SOME DATE ON THE ANALYSIS OF URANIUM, THORIUM, AND ZIRCONIUM (in Hungarian)
Considering the physicochemical conditions for tributyl phosphate (TBP) uranium extraction, an optimum nitrate concentration of the aqueous phase is found, in which uranium separation by single extraction amounts virtually to 100%. The extraction is carried out in TBP-petrol solution and the uranium is re- extracted in a dilute ammonium carbonate solution. The uranium content can be determined by the morin method. or by reduction of U(Vl) to U(lV) and subsequent oxidizing with Fe(III), which can be measured by the light absorption of alpha - alpha dipyridyl complex equivalent to uranium (at 500 m mu wavelength). In the chromatograpy of thorium, it is found that using a particular solvent, thorium produces an elongated strip on a cellulose column or on paper. This strip becomes more compact with incresing acid and water content of the solvent. The optimum composition of the solvent is determined: 8N nitric acid is shaken with the same quanity of ether and after separation of the two phases the ethr phase is used. Among the colorimetric determinations of thorium, the thoron method is improved for the analysis of ores by reducing Fe(III) in ascorbic acid. The sensnttivity of the method increases by about 70% by the addition of methylalcohol. Zirconium and hafnium, which can be separated selectively with mandelic acid, can be determined as follows the precipitate, containing 0.2 to 5 mg zirconium, is dissolved in excess concentrated sulfuric acid. and the mandelic acid bound to the zirconium is quantitatively oxidized into carbon dioxide and water with sodium bichromate solution. In the presence of 2 to 20 mg zirconium the oxidation can be carried out with - excess KMnO/sub 4/ in a strong alkaline medium. In this case the mandelic acid oxidizes into benzoic acid. The vivid yellow zirconium morin complex fluorescing in UV light is suitable for the photometric determination of 0.1 to 30 mu g zirconium. Measurements can be carried out between 420 and 470 m mu . (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-023653
- OSTI ID:
- 4819329
- Journal Information:
- Magyar Tudomanyos Akad. Kozponti Fiz. Kutato Intezetenek Kozlemenyei, Vol. Vol: 6; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- Hungarian
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Related Subjects
ABSORPTION
ACIDITY
AMMONIUM COMPOUNDS
BENZOIC ACID
BUTYL PHOSPHATES
CARBON DIOXIDE
CARBONATES
CELLULOSE
CHEMICALS
CHROMATOGRAPHY
CHROMIUM OXIDES
COLOR
COLORIMETRY
CONCENTRATION
EFFICIENCY
ETHERS
ETHYL RADICALS
FLUORESCENCE
FREQUENCY
HAFNIUM COMPOUNDS
HYDROXIDES
IRON COMPLEXES
IRON COMPOUNDS
LIGHT
MANDELIC ACID
MANGANESE OXIDES
MEASURED VALUES
METHANOL
MORIN
NITRATES
NITRIC ACID
ORES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
PAPER
PERMANGANATES
PETROLEUM
PHOTOMETRY
POTASSIUM COMPOUNDS
PRECIPITATION
PYRIDINES
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
QUANTITY RATIO
RADON 220
REDUCTION
SENSITIVITY