Primary methods of measurement in chemical analysis |
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Authors: | W Richter |
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Institution: | (1) Physikalisch-Technische Bundesanstalt, D-Braunschweig, Germany Tel.: +49-(0)531-592-3200, DE |
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Abstract: | Primary methods of measurement have a central function in metrology. They are an essential component in the realisation of
the SI units and therefore are indispensable for establishing traceability of measurements of all kinds of physical quantities
to the corresponding SI units. This is also true for chemical analysis. Gravimetry, titrimetry, coulometry, and isotope dilution
mass spectrometry (IDMS) are evaluated with regard to their potential to be primary methods according to a general definition
of primary methods recently given by the Comité Consultatif pour la Quantité de Matière (CCQM). Optical absorption spectrometry
and methods based on colligative properties are also considered. A general scheme for establishing traceability of chemical
measurements to the SI units using primary methods is discussed.
Received: 17 April 1997 · Accepted: 9 August 1997 |
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Keywords: | Traceability to SI Primary methods Comparability |
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