VERIFICATION AND USE OF CONTROL CHARTS IN SPECTROCHEMICAL ANALYSIS;ESTIMATING MEASUREMENT UNCERTAINTY

Štefica Celap

Abstract

Consistency in analysis depends on being aware of a significant change in instrumental response, such as that caused by drift or changes in analytical precision, or both, and taking corrective action. The usual corrective action for drift is standardization. Standardization, however, when there is no real need, ca only broaden the spread of subsequent analyses. One purpose of this practice is to set guidelines that will avoid overstandardization. To control manufacturing processes, there must be confidence that a consistent material is being produced and that the analysis of the material is reliable. For assurance that the material meets specification, a purchaser may require the supporting record of control charts to assess that proper analytical control has been maintained.

Keywords

spectrochemical, measurement uncertainty, control charts

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PWC-2006-TC8-025u.pdf

DOI

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IMEKO TC

TC8 - Traceability in Metrology

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