zinc in several edible oil samples obtained from local markets.
Since there are no available certified reference samples of edible oils for zinc determination, oil based multi-element stock solution containing zinc was analysed in triplicate using of the EIEB procedure previously mentioned above.
An oil based multi-element material has a certified value of 100 lg1.
By using the developed procedure the zinc concentration was obtained in this oil based
multi-element material was 97 ± 1 lg g1.