THE VOLUMETRIC DETERMINATION OF THORIUM IN HIGH GRADE THORIUM PRODUCTS USING A SPECTROPHOTOMETRIC TITRATION
Technical Report
·
OSTI ID:4332644
A procedure is described for determining thorium in high-grade thorium products by means of a spectrophotometric titration using ethylenediaminetetraacetic acid (EDTA) as the titrant and pyrocatechol violet as the indicator. Preliminary removal of interfering ions is carried out by means of an oxalate separation. A comparison of several possible separation procedures for removal of interfering ions is made and a number of factors which affect the nature of the spectrophotometric end point are discussed. The precision of the method has been determined for the titration procedure on standard solutions and for the entire procedure on typical samples. On products containing from 70 to 100% thorium, the standard deviation expressed as the percentage of the mean was found to be about 0.77%. This represents a 95% confidence level of approximately plus or minus 0.5. (auth)
- Research Organization:
- Canada. Dept. of Mines and Technical Surveys. Mines Branch
- NSA Number:
- NSA-12-008317
- OSTI ID:
- 4332644
- Report Number(s):
- NP-6670; TR-148/57
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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