Preparación y evaluación de un material de referencia interno para la determinación de Fe, Si y Ni en el mineral laterítico del norte oriental de Cuba

Developing and  evaluating  preliminarily an internal reference material (IRM) for the determination of Fe, Si and Ni in  the  lateritic ore  from  the  Eastern North of Cuba is the aim of this paper. For that reason, an internal reference sample was prepared, which was made and evaluated according to the established instructions of normalization. Preparation and evaluation of IRM were  essential  in order to obtain more reliable analytic results, to decrease the quality costs and to give greater satisfaction to the client by our analytic services. Fifteen duplicates were made to evaluate statistically the obtained results and to certify the contents of the analyzed elements. For the homogeneity test, was chosen the metal Ni as element to be evaluated. Conclusive results were obtained from good homogenization of the sample. Keywords: internal reference material (IRM), reference material, control sample.