THE "THORIN" COLORIMETRIC METHOD FOR THORIUM DETERMINATION: EFFECT OF SOME COMMON IONS, AND METHODS FOR OVERCOMING INTERFERENCES

Technical Report · Wed Nov 26 04:00:00 EST 1958

OSTI ID:4248384

Bouvier, J A.F.; Guest, R J

The effect of a number of common ions on the Thorin colorimetric method for Th determination were investigated. A comparison was carried out on the use of the two reducing agents, ascorbic acid and hydroxylamine hydrochloride, for overcoming the interference of Fe and Ce. Mo caused low Th assays in the presence of ascorbic acids whereas this effect was not found with hydroxylamine hydrochloride presents or in the absence of a reducing agent. Ti caused low Th assays under any conditions tried and a very low tolerance limit must be set for this ion. Zr caused high Th assays under normal conditions, but its effect varied with the form in which it was added, and appeared to be enhanced by the presence of Th. By using mesotartaric acid as a masking agent for Zr approximately 5 mg of Zr could be tolerated in a final 25 mi volume taken for the colorimetric finish. In the absence of Zr, mesotartaric acid is not required and a final volume of 250 ml is usecl. (auth)

• Research Organization: Canada. Dept. of Mines and Technical Surveys. Mines Branch
• NSA Number: NSA-13-014237
• OSTI ID: 4248384
• Report Number(s): NP-7538; R-34
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
AMINES
ARSENIC COMPOUNDS
ASCORBIC ACID
CERIUM
CHEMISTRY
CHLORIDES
COLOR
HYDROXIDES
IMPURITIES
INTERFERING ELEMENTS
IONS
IRON
LIGHT
MEASURED VALUES
MOLYBDENUM
NAPHTHOL
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
PERFORMANCE
PHENYL RADICALS
PHOTOMETRY
QUALITATIVE ANALYSIS
QUANTITY RATIO
REDUCTION
SPECTROSCOPY
SULFONIC ACIDS
TARTARIC ACID
THORIN
THORIUM
THORIUM COMPLEXES
TITANIUM
VITAMINS
VOLUME
ZIRCONIUM