Modification of the Method of Componental Analysis of Coal Ash by XRFS

Twelve components (i.e., SiO2, Al2O3, Fe2O3, CaO, MgO, P2O5, K2O, Na2O, TiO2, V2O5, MnO and SO3) in coal ash were determined by XRFS. The glassy melt of sample of coal ash was obtained by fusion with Li2B4O7 and LiBO2 as flax, NH4NO3 as oxidant and LiBr as demoulding agent. Standard working curves were prepared by using standard samples and mixtures of standard samples. Interferences due to matrix effects and overlapping of spectral lines were overcomed by the methods of α-coefficient and empirical coefficient. Results of 12 components obtained by the present method were found to check quite well with those obtained by chemical method and ICP-AES. Ten glassy melts were prepared from the same sample of coal ash and the 12 components were determined by the present method, values of RSD′s (n=10) found were in the range of 0.06%-2.4%.