Some aspects of the evaluation of measurement uncertainty using reference materials |
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Authors: | M Buzoianu |
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Institution: | (1) National Institute of Metrology, Reference Materials Group, Sos. Vitan-Barzesti No.11, 75669 Bucharest, Romania e-mail: office@inm.ro Tel.: +401-334-5060 Fax: +401-334-5345, RO |
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Abstract: | In practice there are three aspects that need to be considered in order to achieve the required traceability according to
its definition: the 'stated reference', the 'unbroken chain of calibrations' and the "stated uncertainty". For a certain chemical
result, each of these aspects highly depends on the measurement uncertainty, both on its magnitude and how it was estimated.
Therefore, the paper describes the experience of the Romanian National Institute of Metrology in estimating measurement uncertainty
during the certification of reference materials (RMs), in metrological activities (calibration, pattern approval, periodical
verification, etc.), as well as during the analytical measurement process. Practical examples of estimation of measurement
uncertainty using RMs or certified reference materials are discussed for their applicability in spectrophotometric and turbidimetric
analysis. Use of the analysis of variance to obtain some additional information on the components of measurement uncertainty
and to identify the magnitude of individual random effects is described.
Received: 12 November 1999 / Accepted: 25 February 2000 |
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Keywords: | Measurement uncertainty Reference materials Turbidimetry |
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