Nutritional element analysis in infant formulas by direct dispersion and inductively coupled plasma-optical emission spectrometry

摘要

A method for direct determination of Ca, Cu, Fe, K, Mg, Mn, Na, P and Zn in infant formulas and milkpowders was developed using a water-soluble, tertiary amine: EDTA dispersant and analysis by inductively-coupled plasma-optical emission spectrometry (ICP-OES). Samples were prepared as slurries in aqueous dispersant (10/100, v/v) incorporating internal standard (Lu) compensation for potential matrix effects and determined against external calibration standards. The instrument was radially configured and incorporated a charge-transfer device detector, facilitating simultaneous acquisition of multi-element and multi-line measurements.