Using the optimized instrumental conditions, calibration curves were constructed for inorganic standards in the three-component solution (proposed method) from which the analytical figures of merits were estimated (Table 2). For comparison purposes calibration curves and the figures of merits were also established for the liposoluble standards diluted in AVK, in accordance with the standard method ABNT NBR 14066 [26] (also showed in Table 2). The curves were linear up to 6.0 mgL−1 Ca, 0.5mgL−1 Mg and 2.0mgL−1 Zn for the proposed method and up to 6.0mgL−1 Ca, 4.0mgL−1 Mg and 1.0mgL−1 Zn for the standard method.