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A simple and fast ultrasound-assisted extraction procedure for Fe and Zn determination in milk-based infant formulas
Ignacio Machado1, Gabriela Bergmann1, Mariela Pistón1
1Analytical Chemistry, Faculty of Chemistry, Universidad de la República (UdelaR), Av. Gral. Flores 2124, P.O. Box 1157, 11800 Montevideo, Uruguay.
Abstract:
A simple and fast ultrasound-assisted procedure for the determination of iron and zinc in infant formulas is presented. The analytical determinations were carried out by flame atomic absorption spectrometry. Multivariate experiments were performed for optimization; in addition, a comparative study was carried out using two ultrasonic devices. A method using an ultrasonic bath was selected because several samples can be prepared simultaneously, and there is less contamination risk. Analytical precision (sr(%)) was 3.3% and 4.1% for iron and zinc, respectively. Trueness was assessed using a reference material and by comparison of the results obtained analyzing commercial samples using a reference method. The results were statistically equivalent to the certified values and in good agreement with those obtained using the reference method. The proposed method can be easily implemented in laboratories for routine analysis with the advantage of being rapid and in agreement with green chemistry.
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