Trace element determination in different milk slurries

We hare studied the contents of trace elements of nutritional or toxicological interest in 90 samples of whole, low-fat, skim, condensed, evaporated and powdered milks. Slurries of the samples were prepared with Triton X-100 and analysed using electrothermal atomic absorption spectrometry. The temperature-time programme of the graphite oven was optimized for each element, and the accuracy, precision, selectivity and sensitivity of the method mere verified. Concentrations of the trace elements we investigated were: Pb 0-0.211 mu g/g, Cd 0-28.985 ng/g, Al 0.528-4.025 mu g/g, Cu 0.041-0.370 mu g/g, Cr 0-0.177 mu g/g, Mn 0.024-0.145 mu g/g, Se 0-23.333 ng/g, Zn 0.297-0.827 mu g/g and Ni 0.058-1.750 mu g/g. (A value of zero indicates that the element was undetectable by our methods.) Concentrations of the pairs of elements Cu-Cd, Mn-Cd, Mn-Cu, Zn-Mn, Ni-Cu, Ni-Mn and Ni-Zn were significantly correlated (P < 0.001). Linear discriminant analysis confirmed the separation between the six types of milk analysed.