5. Discussion
From these results, it was found that there is no significant difference between the resulting expanded uncertainties (at 95% confidence levels) obtained with GUM and GUM S1 (Monte-Carlo). These results are due to the linearity of the mathematical model for pH measurement. In the case of model non-linearity, there is likely to be a significant difference. For quality assurance purposes, it is advisable to run these two calculations in parallel to check the results.
In addition, the GUM and GUM S1 (Monte-Carlo) approaches lead to lower values than the global approach, because the global approach assesses uncertainties about the method (uncertainty about a single measurement is included), which implies that all sources of uncertainty are taken into account and overestimated, so the global approach takes into account the real daily variation observed in a laboratory....
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Discussion
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Bibliography
Websites
VIM 3: international vocabulary of metrology, Bureau International des Poids et Mesures (BIPM) website: https://www.bipm.org/fr/publications/guides/vim.html (page consulted on February 8, 2019)
Standards and norms
AFNOR
- Metrology – Monte Carlo evaluation of measurement uncertainty – Principles and implementation of GUM Supplement 1. AFNOR - FD X07-023 - 2012
- Exactitude (justesse et fidélité) des résultats et méthodes de mesure. Partie 2 : Méthode de base pour la détermination de la répétabilité et de la reproductibilité d'une méthode de mesure normalisée. IMANOR - NM...
IMANOR
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