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Estimation of uranium in columbite-tantalite samples: A method for sample solution preparation for fluorimetric
B K Balaji1, A Premadas, G V Ramanaiah
1Chemical Laboratory, Atomic Minerals Division, Department of Atomic Energy, 'Patan Bhavan', Race Course Road, Bangalore-560 001, India.
Talanta
|October 1, 1984
Summary
A new method dissolves columbite-tantalite samples for uranium analysis. This technique uses ammonium hydrogen fluoride and boric acid for accurate fluorimetric estimation of uranium in various samples.
Area of Science:
- Analytical Chemistry
- Geochemistry
Background:
- Accurate uranium determination is crucial in geochemical analysis.
- Columbite-tantalite ores present challenges for sample dissolution due to refractory elements like tantalum and niobium.
Purpose of the Study:
- To develop a robust method for dissolving columbite-tantalite samples for uranium analysis.
- To enable accurate fluorimetric estimation of uranium in complex geological matrices.
Main Methods:
- Dissolution of columbite-tantalite using nitric acid.
- Addition of ammonium hydrogen fluoride to solubilize tantalum, niobium, and titanium.
- Complexation of excess fluoride with boric acid.
Main Results:
- A clear solution of columbite-tantalite samples was obtained in a nitric acid medium.
- The method effectively prevented interference from tantalum, niobium, and titanium.
- Successful application to both synthetic and natural columbite-tantalite samples.
Conclusions:
- The developed method provides a reliable way to prepare columbite-tantalite samples for uranium analysis.
- This technique facilitates accurate fluorimetric estimation of uranium in challenging geological materials.
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