The bauxite samples of the deposits of Almeirim and Camoai (State of Para - Amazon region - Brazil) were characterized by chemical analysis, using X-ray fluorescence spectrometry. Sample preparation methods were developed to analyse Si, Al, Fe, Ti, Zr, Ga, V, Nb and Cr by this method. Matrix correction was aplied in XRF calibration. Analytical errors were estimated, the acuracy was determined by
... [Show full abstract] analysis of a international standard sample (BXN). Precision, accuracy and reproducibility were determined by repeated sample preparation and measuring.