An improved method for the determination of uranium isotopes in environmental samples by alpha-spectrometry |
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Authors: | Guogang Jia G Torri P Innocenzi |
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Institution: | (1) Italian Environmental Protection Agency and Technical Services, Via V. Brancati 48, 00144 Rome, Italy E-mail |
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Abstract: | In order to improve the selectivity of the uranium isotopes determination in environmental samples, further studies have been
carried out, including (1) interference of 210Po with uranium isotope determination, (2) distribution coefficients of polonium between 5% TOPO in toluene and aqueous hydrochloric
and nitric acids, (3) decontamination factor of uranium from polonium of the recommended procedure, and (4) leaching effect
comparison of two different leaching procedures in a lichen sample. Based on the new findings, a more accurate extraction
chromatographic/ a-spectroscopy method has been developed. For the method's validation, four kinds of reference materials
supplied by the IAEA have been tested. It is observed that nearly all the 238U, 234U and 235U concentrations obtained are in good agreement with the recommended or information values, showing that the method can give
reliable results. A comparison with existing uranium determination methods has also been made. It is concluded that due to
involving preconcentration and chemical separation, the extraction chromatographic/a-spectroscopy method is a more selective,
very sensitive and accurate, and low cost method.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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