It should be emphasized that the C2H2/N2O flame was used because it was recommended by the standard method [26]. Ionization suppressor (2 g L−1 K) was also used as described in Section 2.4. However, from the results obtained in this work, we concluded that this hotter flame is not necessary for magnesium determination by the proposed method, as will be shown in the validation experiments. The last but not least, the precision of the results obtained with the proposed method was better for all elements investigated, as reflected by the RSD for standard and sample measurements. This feature is due to the lower fluctuation of the flame with the three-component solution.