A reliable spectral analysis method for quantitative detennination of zirconium and niobium content in rock samples has been developed. A chemical enrichment procedure was adopted as the concentration of these elements in rocks was very low. Histograms showing the frequency distri· butions of the estimated elements were drawn.
N BARAKAT ,F SHARAF ,E M EL SHAZLY ,I S ALY ,F H ABOU EL NOUR ,
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