Rapid laser fluorometric method for the determination of uranium in soil, ultrabasic rock, plant ash, coal fly ash and red mud samples |
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Authors: | A Premadas P K Srivastava |
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Institution: | (1) Chemical Laboratory, Atomic Minerals Directorate for Exploration and Research, Civil Lines, 440001 Nagpur, India |
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Abstract: | A simple and rapid laser fluorometric determination of trace and ultra trace level of uranium in a wide variety of low uranium
content materials like soil, basic and ultra basic rocks, plant ash, coal fly ash and red mud samples is described. Interference
studies of some common major, minor and trace elements likely to be present in different, geological materials on uranium
fluorescence are studied using different fluorescence enhancing reagents like sodium pyrophosphate, orthophosphoric acid,
penta sodium tri-polyphosphate and sodium hexametaphosphate. The accurate determination of very low uranium content samples
which are rich in iron, manganese and calcium, is possible only after the selective separation of uranium. Conditions suitable
for the quantitative single step extraction of 25 ng to 20 μg uranium with tri-n-octylphosphine oxide and single step quantitative
stripping with dilute neutral sodium pyrophosphate, which also acts as fluorescence enhancing reagent is studied. The aqueous
strip is used for the direct laser fluorometric measurement without any further pretreatment. The procedure is applied for
the determination of uranium in soil, basalt, plant ash, coal fly ash and red mud samples. The accuracy of the proposed method
is checked by analyzing certain standard reference materials as well as synthetic sample with known quantity of uranium. The
accuracy and reproducibility of the method are fairly good with RSD ranging from 3 to 5% depend upon the concentration of
uranium. |
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