Closed-vessel microwave acid digestion of foodstuffs and trace aluminum determination by graphite furnace atomic adsorption spectrometry
1994
Yang, Q. | Pennickx, W. | Smeyers-Verbeke, J.
The estimation of the daily dietary intake of aluminum is part of an ongoing project aimed at the assessment of the daily intake of food constituents by the Belgian population. This requires a reliable analytical method that is applicable to different solid foodstuffs and can easily be implemented in an analytical laboratory. A method is proposed for the dissolution of food samples with microwave digestion (HNO3-H2O2 2:0.5) and for the subsequent Al determination by graphite furnace atomic absorption spectrometry. The use of closed-vessel microwave acid digestion shortens the time for sample dissolution and improves the analysis quality. A direct calibration against aqueous solutions was used for all of the foodstuff digests. For the method validation, standard reference materials were analyzed. Aluminum was determined in 13 different types of bread and 30 types of fish. The limit of detection in solution is about 3 micrograms/L (3 sigma). Some samples with relatively higher aluminum content were identified.
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