RAPID DETERMINATION OF THORIUM BY FLUORIDE TITRATION USING SOME CHROMOTROPIC AZO DYES

Journal Article · Fri Jul 01 04:00:00 EDT 1960 · Bull. Chem. Soc. Japan

DOI:https://doi.org/10.1246/bcsj.33.882· OSTI ID:4103607

Datta, S K

The thorium-chromotropic azo dye complexes are found to be fast-reacting with fluorides, in which exchange of dye molecule for fluorlde ion takes place. The colored thoriumdye complexes are thereby decomposed with the liberation of the free dye and formation of thorium fluoride. The color changes at the end point enable visual comparison. Three dyes: nitroso-SNADNS-4, SNADNS-6, and CHPADNS were used as thorium complexing agents or indicators. The color change with the nitroso-SNADS-4 at the end point is very sharp. Titrations are best carried out at pH range 2.4 to 2.8 and thorium present should not be more than 50 mg per 50 ml solution. With the increased precipitation of thorium fluoride the dyes are adsorbed in the precipitate and the end point becomes more obscured. Microgram amounts of thorium may be determined by this method. A large number of cations and anions interfere in the process, of which the most important are: iron, cerium, rare earth elements, alkaline earth elements, phosphates, borates, oxalates, tartrates, and citrates. This method is best applicable to thorium solutions from which the interfering elements have been removed. (auth)

• Research Organization: Victoria Coll., Coochbehar, India
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-008701
• OSTI ID: 4103607
• Journal Information: Bull. Chem. Soc. Japan, Journal Name: Bull. Chem. Soc. Japan Vol. Vol: 33
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ADSORPTION
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
ANIONS
BORATES
CATIONS
CERIUM
CHARGED PARTICLES
CHEMISTRY
CHERENKOV RADIATION
CITRIC ACID
COLOR
COMPLEXES
DECOMPOSITION
DYES
FLUORIDES
INELASTIC SCATTERING
INTERACTIONS
INTERFERING ELEMENTS
IRON
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALATES
PARITY
PHOSPHATES
PRECIPITATION
QUANTITATIVE ANALYSIS
RARE EARTHS
RELATIVITY THEORY
SALTS
SCATTERING
TARTARIC ACID
THORIUM
THORIUM FLUORIDES
USES