CARACTERIZAÇÃO ELEMENTAR DA CASCA DE ARROZ E SUAS CINZAS POR MIP OES APÓS DECOMPOSIÇÃO ÁCIDA COM SISTEMA DE REFLUXO

This paper describes the optimization of a sample preparation method using response surface methodology for Al, Cd, Cu, Fe, Mg, Mn, Mo, Na, Ni and Ti determinations in samples of rice husk and rice husk ash by MIP OES. Sample preparation was performed using a reflux system adapted to the digestion tubes. This system allowed the decomposition of the samples without the necessity of replacement of the acids during this step without any loss of volatile elements. The decompositions were performed with 3.6 mL of HNO3 and 1.4 mL of H2SO4 for 205 min in a digester block at 225 ºC. The detection lim...