Determination of vanadium and molybdenum by atomic-absorption spectrophotometry
A method is described for the determination by atomic-absorption spectrophotometry of vanadium and molybdenum, up to the milligram level, in samples of yellow cake, uranium-bearing minerals, and geochemical standards. After attack with acids these two elements are separated from each other and from matrix elements by means of anion-exchange in 6M hydrochloric acid on the strongly basic anion-excharge resin Dowex 1, X8 (chloride form). Vanadium is unadsorbed and passes into the effluent while molybdenum is adsorbed on the resin. For the elution of molybdenum a mixed aqueous-organic solvent system consisting of methanol and 6M hydrochloric acid (9: 1 v/v) is used. Aft er evaporation of the 6M hydrochloric acid effluent and of the mixed aqueous-organic eluate, vanadium and molybdenum are determined by atomic-absorption spectrophotometry. The method was tested by analyzing numerous samples with contents ranging from a few ppM to milligram amounts of vanadium and molybdenum. For comparison, the concenirations of these two elements were determined in a large number of samples by spectrophotometric and titrimetric procedures. In all cases very good agreement of results was obtained. (auth)
- Research Organization:
- Univ., Vienna
- NSA Number:
- NSA-29-023928
- OSTI ID:
- 4310243
- Journal Information:
- Talanta, v. 20, no. 11, pp. 1153-1165, Journal Name: Talanta, v. 20, no. 11, pp. 1153-1165; ISSN TLNTA
- Country of Publication:
- United Kingdom
- Language:
- English
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Related Subjects
*VANADIUM-- ABSORPTION SPECTROSCOPY
COMPARATIVE EVALUATIONS
HYDROCHLORIC ACID
ION EXCHANGE CHROMATOGRAPHY
LEACHING
MATRIX ELEMENTS
METHANOL
N40120* --Chemistry--Analytical & Separations Chemistry-- Chemical & Spectral Procedures
ORGANIC ION EXCHANGERS
QUANTITATIVE CHEMICAL ANALYSIS
SPECTROPHOTOMETRY
TITRATION