XRF Spectrometry Determination of Impurities in Silica

In the XRF spectrometric determination of impurity components in silica,the flux used for fusion of sample was modified by adding CaO to the compound flux of Li2B4O7+Li3BO3 mixture in the ratio of 3 parts(in grams) of CaO to 7 parts(in grams )of the compound flux.By using this modified flux mixture,the appearance of insoluble silicon dioxide particles in the glassy fusion melt piece(usually called the crystalline speckle phenomenon) was eliminated,and complete decomposition of the silica sample was achieved.As shown by the analytical results of Al2O3,Fe2O3,MgO and TiO2(present as impurity components in silica),comformity with the results obtained by chemical methods was obtained.