DETERMINATION OF TRACE CADMIUM IN 24-H DIETS BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY

摘要

An analytical procedure for the determination of trace Cd in 24-h diets with graphite furnace atomic absorption spectrometry is developed and validated. Closed-vessel microwave acid digestion was used for the sample dissolution. To evaluate the bias of the method, reference materials were analyzed, and the results are in good agreement with the certified values. The precision of the method was evaluated by the analysis of a total diet sample and the repeatability and reproducibility (RSD) are 1.4% and 7.3%, respectively. The limit of detection and the limit of quantification in the dry product are 0.004 and 0.012 mu g/g, respectively. Cd is determined in 28 total diet samples collected during 7 days at four locations in Belgium. The estimated daily Cd dietary intake in Belgium is 18.4 +/- 6.0 mu g, which is acceptable compared with the ADI (60 mu g/day) established by the FAO/WHO.