A COMPLEXOMETRIC DETERMINATION OF THORIUM IN THE PRESENCE OF CERIUM

Journal Article · Wed Jan 01 04:00:00 EST 1958 · Revista de Chimie (Bucharest) (Romania) Absorbed Chim. Anal. (Bucharest)

OSTI ID:4253416

Lupan,

S>A small amount of Th/sup 4+/ (1 to 20 mg) in the presence of a considerable amount of Ce/sup 3+/ (up to 500 mg) is determined by titration with a complexone III solution in a hydrochloric acid medium using pyrocatechin violet as the indicator. A weighed amount of the Th and Ce oxides separated prior to the analysis are dissolved by heating in HCl with the addition of 0.01 to 0.2 g of KI. The solution is evaporated to dryness, and the residue is dissolved in 0.5 ml of concentrated HCl. The solution is diluted with water to 50 ml. To that, 10 to 20 ml of C/sub 2/H/sub 5/OH is added and the solution is boiled until colorless Ce/sup 4+/ is reduced to Ce/sup 3+/, cooled and diluted with water to 250 ml. To that, 4 to 5 drops of 0.1% pyrocatechin violet is added, and the solution is titrated with 0.01 complexone solution until the color is changed from pink to yellow. One ml of 0.01 N Complexone III solution corresponds to 0.00264 g of ThO/sub 2/. The CeO/sub 2/ is determined by its various forms. La, Pr, and Nb do not interfere with the determination.

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-13-007562
• OSTI ID: 4253416
• Journal Information: Revista de Chimie (Bucharest) (Romania) Absorbed Chim. Anal. (Bucharest), Journal Name: Revista de Chimie (Bucharest) (Romania) Absorbed Chim. Anal. (Bucharest) Vol. Vol: 9, No. 2; ISSN RCBUA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BOILING
CERIUM
CERIUM OXIDES
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DYES
ETHANOL
EVAPORATION
HYDROCHLORIC ACID
LANTHANUM
NIOBIUM
POTASSIUM IODIDES
PRASEODYMIUM
QUANTITATIVE ANALYSIS
QUANTITY RATIO
REDUCTION
SEPARATION PROCESSES
SOLUTIONS
THORIUM
THORIUM OXIDES
WATER