UTILIZAÇÃO DO ESPECTRÔMETRO DE ABSORÇÃO ATÔMICA PARA DETERMINAÇÃO DE CLORIDRATO DE METFORMINA E CLORIDRATO DE RANITIDINA EM MEDICAMENTOS

The utilization of atomic absorption spectrometer for metformin (MET) and ranitidine (RAN) chlorohydrates determination in medicines is proposed. The spectral lines of nickel and aluminum at 232.0 and 308.2 nm were selected for MET and RAN absorbance monitoring, respectively. The results were compared to those obtained by molecular absorption spectrometry at ultraviolet range (spectrophotometry) and condutometric titration. The figures of merit obtained were adequate for MET and RAN determination in medicines. The limit of detection (LOD) of 0.01 mg L-1 obtained for MET and RAN, were similar and even lowers than those obtained by spectrophotometry and comparable with those found in the literature. The precision evaluated by relative standard deviation (RSD) was lower than 6%. The analytical application shows that in the analyzed samples the MET and RAN concentrations were in agreement with specified value in the label and the limits required by Brazilian legislation.