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Spectrophotometric determination of uranium using ascorbic acid as a chromogenic reagent
K K Gupta1, P G Kulkarni, G Thomas
1Fuel Reprocessing & Nuclear Waste Management Group, PREFRE Plant, B.A.R.C., Tarapur, India.
Talanta
|April 1, 1993
Summary
A new spectrophotometric method accurately determines uranium(VI) using ascorbic acid. This simple, precise technique is valuable for analytical control in processes like PUREX.
Area of Science:
- Analytical Chemistry
- Inorganic Chemistry
Background:
- Accurate determination of uranium(VI) is crucial for nuclear fuel reprocessing and waste management.
- Existing methods may lack simplicity, precision, or applicability to relevant concentrations.
Purpose of the Study:
- To develop a simple, accurate spectrophotometric method for quantifying uranium(VI).
- To assess the method's applicability for analytical control in uranium processing.
Main Methods:
- Spectrophotometric analysis of uranium(VI)-ascorbic acid complex formation.
- Optimization of reaction conditions, including pH and stability.
- Quantification using absorbance measurements at 360 and 450 nm.
Main Results:
- Uranium(VI) forms a stable, reddish-brown complex with ascorbic acid.
- Optimal complex formation occurs at pH 4.2-4.5 and remains stable for 24 hours.
- The method provides precise uranium determination in the range of 8-200 µg/ml, tolerating common metal impurities.
Conclusions:
- The developed spectrophotometric method is simple, accurate, and precise for uranium(VI) determination.
- The method is suitable for analytical control in uranium concentration ranges relevant to the PUREX process.
- Ascorbic acid serves as an effective reagent for uranium(VI) spectrophotometry.
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