Metals Determination by Microwave Digestion ICP-OES of Some Dietary Supplements and Diet Products in Turkey

Abstract

Inductively coupled plasma optical emission spectrometry (ICP-OES) analysis was applied
to metals concenrations in ten samples of some dietary supplements and diet products in
Turkey. The As, Cr, Zn, Pb, Cd, Co, Ni, Hg, Mn, Fe, Al and Cu contents of dietary supplements
and diet products were determined using microwave digestion. The digestion method with
acid mixture (HNO3 + HCl) was used to break down the organic material of dietary
supplements and diet products. The results of analysis showed that the mean level of metals
were Ni 3.34 ± 0.01 µg/g, Zn 41.24 ± 0.63 µg/g, Mn 23.27 ± 0.25 µg/g, Fe 221.10 ± 1.53
µg/g, Al 18.46 ± 0.14 µg/g and Cu 7.76 ± 0.15 µg/g for dietary supplements and diet
products. The concentration of other metals and heavy metals was not found sufficiently.
Based on the results obtained in the current work has sensitivity, and accuracy. Calibration
curves showed a good linearity for all elements (R2>0.999). The quantitation limit ranged
2.5 to 5 µg/L in dietary supplements and diet products. Recoveries were in the range 92.12-
102.08%. The results obtained form this study have shown good accuracy and
reproducibility.