EXTRACTION AND DETERMINATION OF IRON AS THE BATHOPHENANTHROLINE COMPLEX IN HIGH-PURITY NIOBIUM, TANTALUM, MOLYBDENUM AND TUNGSTEN METALS
A spectrophotometric method for determining iron in the range 0.001 to 0.125% in high-purity niobium, tantalum, molybdenum, and tungsten metals is described. After sample dissolution and reduction of iron to the bivalent state with ascorbic acid and hydroxylamine hydrochloride, the red complex formed between iron(II) and bathophenanthroline (4,7-diphenyl-1,10-phenarthroline) is extracted into n-amyl alcohol and the absorbance of the resulting extract is determined at 536 m mu . Interference from copper is eliminated with thiourea. Cobalt, cadmium, nickel, manganese, and zinc also interfere, but the amounts of each of these impurities present in the four high-purity metals described are so low that their irterference effects are negligible in the proposed method. Higitly reproducible and precise results can be obtained with careful control of the pH during reduction and extraction. (auth)
- Research Organization:
- Dept. of Mines and Technical Surveys, Ottawa
- NSA Number:
- NSA-17-007984
- OSTI ID:
- 4754135
- Journal Information:
- Talanta (England), Journal Name: Talanta (England) Vol. Vol: 9; ISSN TLNTA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
Selective transport of copper(I, II), cadmium(II), and zinc(II) ions through a supported liquid membrane containing bathocuproine, neocuproine, or bathophenanthroline
DETERMINATION OF NICKEL IN HIGH-PURITY NIOBIUM, TANTALUM, MOLYBDENUM AND TUNGSTEN METALS BY CHLOROFORM EXTRACTION OF NICKELII DIMETHYLGLYOXIMATE
Related Subjects
ALCOHOLS
AMINES
ASCORBIC ACID
CADMIUM
CHEMISTRY
COBALT
COLOR
COPPER
IMPURITIES
IRON
IRON COMPLEXES
MANGANESE
MOLYBDENUM
NICKEL
NIOBIUM
ORGANIC SULFUR COMPOUNDS
PHOTOMETRY
QUANTITATIVE ANALYSIS
REDUCTION
SOLUTIONS
SOLVENT EXTRACTION
SPECTRA
SPECTROSCOPY
TANTALUM
TRACE AMOUNTS
TUNGSTEN
UREA
VITAMINS
ZINC