determining the content of silicon dioxide in bauxites using x-ray fluorescence spectrometry

The x-ray fluorescence spectrometry and the ma.bm.006 reference spectrophotometric methods were used to determine the content of sio2 (%) in bauxites from different deposits. the treatment of samples prior to the analysis involved the following steps: annealing, melting using the borax method, and the formation of beads. certified reference bauxite samples were used for the calibration curve. the calibration curve was produced with the correlation coefficient of r =0.9999 and the standard error of s = 0.0246. the average residual value between the content of sio2 determined using the xrf method, and the reference method was 0.045, with a standard deviation of 0.068. the xrf method was statistically verified by the f- and t-tests (using the standard sample and the reference method). the values obtained in the tests show that the xrf method yields accurate results and that there are no standard errors