Enhanced determination of iodine by molecular absorption spectrometry after dispersive solid-phase extraction with direct quantification of selenium in foods.

The determination of iodine after the enrichment on solid sorbent ZrO in the combination with molecular absorption spectrometric (MAS) detection is presented. The detection limit and enrichment factor obtained were 0.009 μg mL and 9, respectively. The main extraction parameters were: sample pH = 3, 40 mg of ZrO and 300 μL of eluent (4 % CHO). The correctness was evaluated by analyzing the matrix-compatible standard reference materials (SRMs). The iodine and selenium contents measured in these reference materials were in satisfactory agreement with the certified values according to the t-test for a 95 % confidence level. The method was used to determine iodine in food samples. To discuss the impact of iodine on human health, the selenium content was also determined. The results obtained can provide consumers with information on the iodine and selenium content of food, and thus help them to better control the functioning of important organs such as the thyroid.