Standard method of test for uranium by controlled-potential coulometry
Milligram amounts of uranium can be determined by controlled-potential coulometry. The determination is based on the direct electrolytic reduction of uranium (VI) at a mercury cathode under conditions such that the electrolysis proceeds with virtually 100% current efficiency, that is, under conditions such that the amount of electricity required to accomplish complete reduction is a measure of the amount of uranium (VI) present. Controlled-potential coulometry is a precise and accurate method of analysis. Uranium(VI) can be determined by this technique with a relative standard deviation as small as 0.05%, without significant bias in the results. The precision is poorer when the coulometric determination is used routinely on samples of various compositions, or when submilllgram amounts of uranium are determined, or when it is necessary to precede the coulometric electrolysis with a chemical separation of uranium. Controlled-potential coulometry is inherently a selective method of analysis. By suitable choice of medium and electrode potential, uranium(VI) can be determined in the presence of many substances that interfere seriously in other highly precise methods for the determination of uranium. The use of a 0.5 M sulfuric acid medium, and reduction at -0.325 V versus the saturated calomel reference electrode (SCE) are recommended here; these conditions are suitable for general use. (LK)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-007534
- OSTI ID:
- 4388957
- Report Number(s):
- ASTM-E--217-70
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Uranium by controlled-potential coulometry
Standard method of test for uranium by controlled-potential coulometry