PHOTOMETRIC TITRATIONS. V. A SELECTIVE, CHELOMETRIC DETERMINATION OF COBALT
Cobalt can be titrated with good selectlvity by converting it with hydrogen peroxide in alkaline medium to the cobalt(Ill) EDTA complex and back- titrating photometrically inacid medium the excess EDTA with bismuth solution, usinb pyrocatechol violet as indicator. No interference is observed with alkalies, alkaline earths, Ni, Cu, Cd, Zn, Pb, Al, U, and W. Bi, Zr, In, Ga, and other ions forming very stable EDTA complexes are co-titrated. Mo, Fe Ag, and Hg interfere and should be separated. The interference of Mn can be excluded by addition of ascorbic acid. Th can be masked with sulfate. Cr(III) is co- titrated, but by applying a different method operating with two aliquots, both Cr and Co can be determined. Complexing anions interfere, as does chloride, which causes a turbidity with blsmuth. (auth)
- Research Organization:
- Georgia Inst. of Tech., Atlanta
- NSA Number:
- NSA-16-006383
- OSTI ID:
- 4804009
- Journal Information:
- Talanta (England), Journal Name: Talanta (England) Vol. Vol: 8; ISSN TLNTA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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ALKALINE EARTH METALS
ALUMINUM
ANIONS
BISMUTH
BISMUTH COMPOUNDS
CADMIUM
CHELATES
CHEMICAL REACTIONS
CHEMICALS
CHEMISTRY
CHLORIDES
CHROMIUM
COBALT
COMPLEXES
EDTA
ERRORS
GADOLINIUM
HYDROGEN PEROXIDES
HYDROXIDES
INDIUM
IONS
IRON
LEAD
MANGANESE
MERCURY
MOLYBDENUM
NICKEL
ORGANIC ACIDS
PHOTOMETRY
PYROCATECHOL VIOLET
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
SENSITIVITY
SEPARATION PROCESSES
SILVER
SOLUTIONS
STABILITY
SULFATES
THORIUM
TUNGSTEN
URANIUM
VITAMIN C
VITAMINS
ZINC
ZIRCONIUM