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Certification of a low value electrolytic conductivity solution using traceable measurements

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Abstract

Reliable measurement results of electrolytic conductivity (EC), in particular for low values, must be metrologically traceable and be based on a realistic measurement uncertainty budget. The use of certified reference materials (CRMs) can help to achieve this goal. This paper presents results from all stages of the certification of an EC CRM with a conductivity of 1.5 μS cm−1, including the preparation of the batch solution and the evaluation of the homogeneity and stability of the bottled CRM. An uncertainty budget is presented for the CRM, including the main contributions from each of these sources. The CRM batch remained stable within its certified uncertainty for more than 1 year.

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Acknowledgments

The authors are grateful for the financial support of CNPq/PROMETRO (process 563112/2010-7) and for the relevant suggestions and contributions to this paper from the researchers Ruth Hearn (LGC), Paulo Paschoal Borges (Inmetro) and Fabiano Barbieri Gonzaga (Inmetro).

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Authors and Affiliations

  1. Electrochemistry Laboratory, Chemical Metrology Division, National Institute of Metrology, Quality and Technology (Inmetro), Av. Nossa Senhora das Graças, 50, Xerém, Duque de Caxias, RJ, CEP 25250-020, Brazil

    Isabel Cristina Serta Fraga, Jéssica Corrêa Lopes, Sidney Pereira Sobral & Carla Matos Ribeiro

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  1. Isabel Cristina Serta Fraga
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  2. Jéssica Corrêa Lopes
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  3. Sidney Pereira Sobral
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  4. Carla Matos Ribeiro
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Correspondence to Isabel Cristina Serta Fraga.

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Fraga, I.C.S., Lopes, J.C., Sobral, S.P. et al. Certification of a low value electrolytic conductivity solution using traceable measurements. Accred Qual Assur 18, 99–104 (2013). https://doi.org/10.1007/s00769-013-0964-0

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  • DOI: https://doi.org/10.1007/s00769-013-0964-0

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