In addition, there was a clear increase in the cadmium absorption signal, both in height and in intergrated absorbance. Gonzalez et al. used a mixture of nitric acid and hydrogen peroxide in the determination of cobalt, chromium and nickel in wheat flour samples by SIS-ET AAS as oxidant modifier of the carbonaceous residues that are retained on the platform due incomplete destruction of the organic matric.Cal-Prieto et al.also encouraged the use of H2O2 to reduce the background and accumulation of carbonaceous residues of biological materials.