Project Details IUPAC/CITAC Guide for evaluation of risks of conformity assessment of a multicomponent material or object due to measurement uncertainty

Project No.:
2018-004-1-500
Start Date:
15 July 2018
End Date:
Division Name:
Analytical Chemistry Division
Division No.:
500

Objective

To develop a joint IUPAC/CITAC guide for classification and quantification of risks of false decisions on conformity of a multicomponent material or object to specification or regulation limits of its chemical composition, due to measurement uncertainty.

The guide will be helpful for improvement of understanding of consequences of measurement uncertainty and correct choice of methods for testing chemical composition of multicomponent materials and objects. The opportunity to work with CITAC and prepare a joint guide (as an IUPAC TR), will give the widest possible exposure to our work and justifies, in our opinion, the requested extension.

Description

The present project is an extension of IUPAC project 2016-007-1-500 “Risks of conformity assessment of a multicomponent material or object in relation to measurement uncertainty of its test results”.

In addition to the known classification of risks of conformity assessment for particular components due to measurement uncertainty, the terms of total risks are defined, necessary for characterization of a batch or lot of material in whole. The law of total probability and Bayesian approach are used for evaluation of total risks when actual (true) concentrations of material components are not correlated, and corresponding test results are mutually independent also. When test results are correlated, the Bayesian approach is combined with the multivariate data analysis. Examples from customs control, pharmaceutical industry, metallurgy and environmental analysis are developed. These topics have been discussed in papers published by the project team (Kuselman I. et al.) in Talanta 164 (2017) 189-195 (https://doi.org/10.1016/j.talanta.2016.11.035) and 174 (2017) 789-796 (https://doi.org/10.1016/j.talanta.2017.06.073), under review in Chemosphere and Accreditation and Quality Assurance journals, as well as at some international conferences and workshops on analytical chemistry, quality and metrology.

However, a guide for classification and quantification of risks of false decisions on conformity of a multicomponent material or object due to measurement uncertainty is necessary for implementation of the findings. The present project will allow completion of the work initially planned in the project 2016-007-1-500 and preparation of the corresponding IUPAC/CITAC Guide.

Progress

Recent publications by the task group:
“Total risk of a false decision on conformity of an alloy due to measurement uncertainty and correlation of test results”, Talanta, available online 17 July 2018, https://doi.org/10.1016/j.talanta.2018.07.049

“Tutorial and spreadsheets for Bayesian evaluation of risks of a false decisions of a multicomponent material or object due to measurement uncertainty”, Chemometrics and Intelligent Laboratory Systems 182:1-8, available online 15 Sep 2018, https://doi.org/10.1016/j.chemolab.2018.09.004

Page last updated 25 Sep 2018