Comparison of fit for a future purpose concept based on tolerance interval and ISO 11352 approaches to predict the quantitative performances and routine uncertainty of an ICP-MS method for the determination of 21 elements in drinking water

On the other hand, a new way of calculating the uncertainty of analytical results derived from β-content γ-confidence, tolerance interval as a complement to the top-down approaches proposed to date was described. The uncertainty estimates obtained by this proposal from validation data were compared via F-test with those arising from the ISO-11352 norm. In the light of this comparison, it can be concluded that our strategy makes it possible to approximate perfectly the routine uncertainty.