Evaluación de la incertidumbre de medición en espectrómetro de chispa para la implementación de la norma iso 17025: estudio interlaboratorio.

Abstract

The objective of the present project is the evaluation of the uncertainty in the spark spectrometer of the Foundry Laboratory of the EPN, this will be done with repeatability and reproducibility studies, and specifically in this thesis the interlaboratory study component will be developed. The final objective is that in the future procedures framed in the ISO 17025 standard can be implemented. For the development of the theoretical part, a bibliographical investigation was carried out to choose a statistical method according to the needs of an interlaboratory test, in addition to correctly applying the statistical concepts necessary for an adequate treatment of the data obtained. The method to be used was established together with the parameters required for the experimental and statistical development to evaluate the uncertainty in the spark spectrometers of each laboratory. For the spectrometry, an aluminum alloy shaft was chosen, which was machined to obtain the test tubes, with which the interlaboratory study was developed with the Extractive Metallurgy Department of EPN (DEMEX). Finally, with the data obtained from both laboratories, statistical calculations were made to comply with the proposed objectives.