Rapid atomic spectrometric determination of sodium, potassium, calcium and magnesium in powdered milk by direct dispersion

Abstract

A method for the determination of Na, K, Ca and Mg in powdered baby milk formulas is proposed. The procedure consists in weighing 0.1 g of milk, adding 10 ml of a solution of lanthanum (4%m/V) and dispersing the mixture in water to give a volume of 100 ml. The samples are then directly introduced into an air-acetylene flame and Na, Ca and Mg are determined by atomic absorption spectrometry using multi-element standards containing La. K is determined by atomic emission spectrometry.