Various methods can be used to determine Mg in dietary supplements, such as: AAS or atomic absorption spectrometry or complexometric titration with EDTA. Before analyzing the samples, we optimized the method: we determined the recording conditions on the AAS (flow of acetylene, air flow and gap width on the slit width), linearity, LOD, LOQ, stability of the calibration curve and repeatability. Content of Mg was determined in six tablets/powders samples and results were compared to the declared value. The homogeneity of Mg distribution was checked in the analyzed effervescent tablet samples. We also made a comparison with the Donat and Radenska mineral waters, and we determined whether by drinking them we could satisfy the average daily intake.
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