Journal Pre-proofs Development of reference material from powdered milk: uncertainties and in‐ terlaboratory evaluation through confidence ellipses Adilson Santana Santos, Liz Oliveira dos Santos, Joao B. Pereira Junior, Fernando M. de Oliveira, Sergio L.C. Ferreira PII: S0026-265X(20)31672-6 DOI: https://doi.org/10.1016/j.microc.2020.105330 Reference: MICROC 105330 To appear in: Microchemical Journal Received Date: 16 May 2020 Revised Date: 21 July 2020 Accepted Date: 21 July 2020 Please cite this article as: A. Santana Santos, L. Oliveira dos Santos, J.B. Pereira Junior, F.M. de Oliveira, S.L.C. Ferreira, Development of reference material from powdered milk: uncertainties and interlaboratory evaluation through confidence ellipses, Microchemical Journal (2020), doi: https://doi.org/10.1016/j.microc.2020.105330 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Published by Elsevier B.V.