An optimized and validated wavelength-dispersive X-ray fluorescence spectrometry method has been developed for the determination of uranium in phosphogypsum. The method is based on the measurement of the intensities of the La1 line for uranium. The concentration of uranium in the phosphogypsum is in the order of 100 ppm with a coefficient of variation of 0.7 %. The method was validated in the concentration range of (0-125) ppm and the different criteria: linearity, specificity, accuracy, repeatability and reproducibility were tested and found acceptable.
The method of determination for uranium and thorium in the industrial phosphoric acid by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) responds positively to all the validation tests and can be adopted for the dosage for these elements. It is clear that the procedure of the proposed method is simple and requires less time to complete the analysis. The concentration for uranium and thorium in the Tunisian phosphoric acid is in the order of 22 ppm for uranium with a coefficient of variation of 0.77% and of about 4 ppm for thorium with a coefficient of variation of 1.37%.
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