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Information leaflets

Setting Target Measurement Uncertainty

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Last Updated: Tuesday, 21 May 2024 20:24

Contents

orange tree trn 180Measurement results are only fit for purpose if the reported uncertainty is correct and has a magnitude small enough for the intended use. The target measurement uncertainty (target MU) is the maximum admissible uncertainty defined for a specific measurement goal. This information leaflet provides a short and accessible introduction to the idea of target measurement uncertainty.

For detailed information on setting a target measurement uncertainty, see the Eurachem/CITAC guide "Setting and Using Target Uncertainty in Chemical Measurement"

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Translations

Translation into other languages is encouraged for members of Eurachem. Other offers of translation should be directed to the Eurachem Secretariat for permission. The Eurachem policy on maintenance and development of Eurachem guidance, available on the Policies page, gives further information on translation.

What is the uncertainty factor?

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Last Updated: Tuesday, 21 May 2024 20:24

Content

Distribution of GMO results showing approximately lognormal distribution

Appropriate expression of the measurement uncertainty (MU) is crucial, and there are situations when the traditional, symmetric, expanded uncertainty interval is not sufficient. This leaflet aims to explain the concept of the uncertainty factor and how it can be used to provide a convenient and realistic uncertainty interval in particular circumstances..

This leaflet was produced by the Eurachem Sampling Uncertainty Working Group and the Royal Society of Chemistry Analytical Methods Committee (AMC) Sampling Uncertainty Working Groups.

Availability

Translation

Please consult the Eurachem Sampling Uncertainty Working Group Chair, directly or by using the UfSWG contact form, if you would like to prepare a translation in your own language.

 

*Publication dates are dates of website publication. English version first published on this site on 2020-07-29.

You talk, we understand – The way out of the tower of Babel

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Last Updated: Tuesday, 21 May 2024 20:24

Contents

Babel 150This leaflet, prepared by the Eurachem Education and Training Working Group, explains the importance of having a common language when discussing measurements. It highlights some terms which are commonly confused or misunderstood, references the International Vocabulary of Metrology ("the VIM"), and introduces the Eurachem Guide on Terminology in Analytical Measurement.

This second edition updates the Information Leaflet to align with the second edition of the Eurachem Guide "Terminology in Analytical Measurement", published in 2023.

 

Availability

This second edition of the information leaflet is currently available in English. For translations of the previous edition, see 'previous editions', below.

1. Dates shown are dates of first publication on this website.

Translation

Translation into other languages is encouraged for members of Eurachem. Other offers of translation should be directed to the Eurachem Secretariat for permission. The Eurachem policy on maintenance and development of Eurachem guidance, available on the Policies page, gives further information on translation.

Previous editions

The first edition of this information leaflet can be found here, in our publication archive. Selected translations of the first edition are listed below for convenience pending translation of the second edition.

1. Amended April 2017

The importance of method validation

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Last Updated: Tuesday, 21 May 2024 20:24

Content

Factors affecting PT strategy

Method validation is an important requirement in the practice of analytical science. ISO/IEC 17025, OECD guidelines on Good Manufacturing Practice and many similar codes of practice require some level of validation, whether by verification of the laboratory's implementation of published standard methods, or by comprehensive validation studies of new, in-house, procedures. Most analytical chemists are aware of its importance, but why it should be done, when, and exactly what needs to be done, is not always clear.

This leaflet, prepared by the Eurachem Method Validation working group, gives a brief introduction to the overall process of validation and the key performance characteristics to be studied, and provides pointers to more detailed guidance.

Availability

Translation

Please consult the Method Validation Working Group if you would like to prepare a translation in your own language.

 

*Publication dates are dates of website publication. English version first published on this site on 2021-02-25.