Verification of methods in accordance with the requirements of ISO/IEC 17025:2017 by the intralaboratory method

Abstract

The article is dedicated to the analysis of the requirements of the standard ISO/IEC 17025:2017 for the verification of test and calibration methods. The necessity of verification of standardized methods is demonstrated and the characteristics of standardized methods that need to be confirmed during their verification are revealed. The method of intralaboratory verification of test methods is proposed, which is to confirm the repeatability and trueness of methods based on the results of control measurements of reference materials in accordance with the principles set out in the series of international standards ISO 5725. This method can be applied to calibrate measures of physical quantities.In case of absence of reference materials, the verification of methods can be performed by interlaboratory comparisons. It is noted that the verification of test methods is a mandatory requirement for calculating the measurement uncertainty according to the reproducibility indicators given in the standardized method. The recommendations for laboratory actions to improve accuracy in case of unsatisfactory verification results are given.