A free non-spectral interferences method based on inductively coupled plasma optical emission spectrometry was characterized in terms of figures of merit for multielemental determination in multimineral/multivitamin preparations. The method was validated for the determination of Mg, Ca, Cr, Mn, Fe, Cu and Zn based on the analysis of a standard reference material (SRM 3280) and different brands of commercially available multimineral/multivitamin supplements. The study showed that a simple 100-fold dilution of the sample ensures overcoming of non-spectral effects in complex matrices such as multimineral/multivitamin preparations. Detection limits were in the range 0.0009-0.0037 mg g-1. The recovery was within 93%-110% for certified reference materials and 94%-105% for real samples of marketed supplements. Precision of measurements was in the range 1.3-12.1%.
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