XRF-Spectral Studies of Solutions and Matrix Affects on Analyte-Line

摘要

The thesis discusses x-ray fluorescence spectral studies at trace level mixture solutions of uranium with typical fission products Sr, Zr, Ru, Cs, Ce and with lanthanides Sm, Eu, Gd, Dy and Hr. The fluorescence spectra of such complex matrices have been analyzed. Interferences of the matrix lines on the analyte line and their remedies have been described. Optimum experimental as well as spectral conditions for determination of: uranium in organic phase, uranium in aqueous phase of 3M HNO3, uranium in fission product in 3M HNO3, uranium in lanthanides in 3M HNO3, fission products elements in uranium fission product matrix in 3M HNO3, and lanthanides in lanthanides - uranium matrix in 3M HNO3 have been established using simulates. Spectral interferences and matrix effect like absorption enhancement have been rectified using calibration standards of similar composition with or without internal standard. Analytical application has been established on the basis of statistical evaluation.