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Article | REF: P105 V1

Assessment of uncertainties in analytical results

Authors: Michèle DÉSENFANT, Marc PRIEL, Cédric RIVIER

Publication date: December 10, 2005, Review date: July 1, 2018 | Lire en français

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    1. Concepts of measurand, characteristic, analysis result

    1.1 Importance of a precise measurand definition

    It may seem trivial to say that defining what you want to measure is the first operation to be carried out by the analyst. The term "measurand", derived from the world of metrology, is not yet in common use among chemists, who more often speak of "analyte". However, the concept is an important one, and deserves a closer look. Standard NF X07-001 "Vocabulaire international des termes fondamentaux et généraux en métrologie" (VIM) defines a measurand as "a particular quantity subject to measurement".

    Example

    vapor pressure of a given sample of water at 20 ˚C.

    Note :

    the definition of the measurand may require...

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