Evaluation of the stability of ethanol in water certified reference material: measurement uncertainty under transport and storage conditions

This study simulated the transport and storage conditions of ethanol in water certified reference material (CRM) produced by the Chemical Metrology Division of Inmetro—DQUIM with the purpose of estimating the measurement uncertainty related to stability. The short-term stability study was performed...

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Bibliographic Details
Published in:	Accreditation and quality assurance Vol. 13; no. 12; pp. 717 - 721
Main Authors:	de Souza, Vanderléa, Rodrigues, Janaína Marques, da C. Cunha Bandeira, Raquel Duarte, das Neves Valente, Laura A., Sousa, Marcus Vinícius Barreto, da Silva, Viviane Fernandes, da Silva, Rafael Agostinho Lemos
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer-Verlag 01-12-2008 Springer Springer Nature B.V
Subjects:	Analytical Chemistry Biochemistry Certification Chemistry Chemistry and Materials Science Commercial Law Ecotoxicology Ethanol Exact sciences and technology Feasibility studies Food Science Fractions Marketing Practitioner's Report Reference materials Stability analysis Temperature Uncertainty Variance analysis Uncertainty Ethanol in water Stability Certified reference material Water Ethanol Feasibility studies Metrology
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Summary:	This study simulated the transport and storage conditions of ethanol in water certified reference material (CRM) produced by the Chemical Metrology Division of Inmetro—DQUIM with the purpose of estimating the measurement uncertainty related to stability. The short-term stability study was performed on five different mass fractions ( w ) in terms of mg ethanol/g solution of the ethanol in water CRM. The nominal values are w = 0.5, 0.9, 1.1, 3.8 and 4.6 mg/g, at temperatures of 4 and 60 °C. On the other hand, the long-term stability study was developed on four different mass fractions (nominal values): w = 0.5, 0.9, 1.1 and 4.6 mg/g, at a temperature of 20 °C. This paper will show the data from the long-term stability study that took place over 52 weeks. The method used complies with ISO Guide 35, the BCR Guideline for Feasibility Studies and ISO Guide 34. According to the statistical parameters used in both studies, the stability of ethanol in water CRM was confirmed for all of the mass fractions studied.
ISSN:	0949-1775 1432-0517
DOI:	10.1007/s00769-008-0448-9