Abstract
Characterization and evaluation of the uncertainty of new powdered milk laboratory reference material were proposed following the recommendations of the ISO Guide 35. A characterization was established through the interlaboratory comparison with the participation of 15 laboratories, being one international. To obtain the property value, initially, the data from the collaborative trial were statistically evaluated using the Grubbs, Cochran, and z-scores tests to identify possible outliers. One-way ANOVA and linear regression analysis were employed to obtain the standard uncertainties associated with characterization (uchar), between-bottle homogeneity (ubb), and long-term stability (ults). The properties values and combined uncertainty (URM) for at the 95% confidence level (k = 2) were as follows (mg g−1): Ca (8.795 ± 1.137), Fe (0.107 ± 0.017), K (11.727 ± 1.983), Mg (0.841 ± 0.125), Na (3.654 ± 0.672), P (7.572 ± 1.174), and Zn (0.032 ± 0.005). Based on the confidence ellipses obtained in the results of the laboratories, it was possible to infer the causes that led to the dispersion of the values. The new material can be a good alternative to evaluate routine procedures, quality control, and validation of analytical methods related to samples of milk and dairy products.
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