SUCCESSIVE DETERMINATION OF THORIUM AND OF THE SUM OF RARE EARTH ELEMENTS BY THE COMPLEXONE METHOD

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Zavodskaya Lab.

OSTI ID:4127154

Chernikhov, Yu A; Tramm, R S; Pevzner, K S

>Instead of the usual coprecipitation of thorium and the rare-earth elements, relying on the subsequent separation of thorium by the iodate or the urotropine method, the two were titrated in turn in the same solution, without separation, by adjusting the pH of the solution. At low pH values, the selectivity of the method increases considerably, and the indicators must be chosen according to the pH range. A mixture, containing oxides of Ce, Nd, Pr, Sm, and small amounts of elements of the Y group in addition to Th, Fe, Ma, Ti, and A1, was prepared from the mineral loparite. The thorium was determined by titrating the buffered solution at pH of about 2 with a 0.02 M solution of Complexone earth element can be tolerated. The inhibiting action of Fe/sup 3+/ can be counteracted by reducing it with ascorbic acid. Nitrates and sulfates do not interfere, but phosphates must be removed prior to the titration. The rare earth elements are then titrated at a pH of 4.5, after reduction of the cerium. (TTT)

• Research Organization: State Scientific Research and Planning Inst. of Rare Metal Industry, USSR
• NSA Number: NSA-15-000174
• OSTI ID: 4127154
• Journal Information: Zavodskaya Lab., Journal Name: Zavodskaya Lab. Vol. Vol: 26
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ALKENES
ALUMINUM
AMINES
ASCORBIC ACID
CALCIUM OXIDES
CERIUM
CHELATES
CHEMICALS
CHEMISTRY
DRUGS
EDTA
ELEMENTS
INDICATORS
INTERFERENCE
IODATES
IODIC ACID
IODINE COMPOUNDS
IRON
LOPARITE
MANGANESE
METHYLENE RADICALS
MINERAL ACIDS
MINERALS
NEODYMIUM
NIOBIUM OXIDES
NITRATES
OXIDES
PHOSPHATES
PRASEODYMIUM
PRECIPITATION
PREPARATION
QUANTITATIVE ANALYSIS
RARE EARTHS
REDUCTION
SAMARIUM
SEPARATION PROCESSES
SULFATES
THORIUM
TITANIUM
TITANIUM OXIDES
UROTROPIN
VITAMIN C
VITAMINS