Abstract
A powdered silicon metal material was prepared as a quality-control standard to provide the Brazilian quality-control laboratories with a means to verify the quality of their results, when determining Ca, Al, Fe, Mn and Ti present as impurities. The material was prepared and its homogeneity tested using one-way ANOVA with an ICP-OES analytical technique. The participating laboratories in the first collaborative trial were requested to use their routine procedures that included XRF, ICP-OES and FAAS techniques to analyse the distributed samples. The statistical analysis results showed that the interlaboratory variabilities were very high. By implementing a suggested protocol to put the solid sample into a solution, the participating laboratories showed better performances in the second run. By attributing values to the prepared material the analytes’ results were obtained in a new collaborative trial. Statistically the data were evaluated with two-way ANOVA. The values and their associated uncertainties included inhomogeneity and characterisation uncertainties.
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Acknowledgments
The authors are pleased to thank the laboratories Ligas de Alumínio S/A (LIASA), Camargo Corrêa Metais S/A, Cia Ferroligas Minas Gerais (MINASLIGAS), SGS do Brasil, Sibra Eletrosiderúrgica, Carborundum do Brasil (Saint-Gobain Cerâmicas & Plásticos Ltda), Electrometalurgica Andina (Argentina), Italmagnésio Nordeste S.A., Centros Tecnológicos da Marinha (Aramar e São Paulo), Fundação Centro Tecnológico de Minas Gerais, Instituto de Química da USP, Instituto de Pesquisas Energéticas e Nucleares and FAPESP for financial support (project number 00/06551-9).
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Hang Chui, Q.S., de Almeida Bispo, J.M. & Iamashita, C.O. A silicon metal quality-control standard preparation by means of collaborative trials of Brazilian laboratories. Accred Qual Assur 10, 681–685 (2006). https://doi.org/10.1007/s00769-005-0032-5
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DOI: https://doi.org/10.1007/s00769-005-0032-5