UNCERTAINTY BUDGET FOR PRIMARY ELECTROLYTIC CONDUCTIVITY MEASUREMENT COMPARING DIFFERENT METHODS |
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| Isabel Cristina S. Fraga, Paulo Roberto G. Couto, Paulo Paschoal Borges, Bianca de Souza R. Marques, Wiler Batista da S. Junior, Carla de M. Ribeiro, Jéssica C. Lopes, Sidney Pereira Sobral, Júlio C. Dias, Valnei S. Cun |
- Abstract:
- In 2007, the Chemical Metrology Division (Dquim) from National Institute of Metrology, Standardization and Industrial Quality - Inmetro, established the primary system of electrolytic conductivity (EC) measurement. The main use of this system is to provide reliability and traceability to the EC measurements in Brazil since its measurement is very important, mainly for determining the purity of water. In order to show comparability and capability in primary EC measurement, Inmetro has participated in the key-comparison organized by Consultative Committee for Amount of Substance (CCQM) called CCQM-K36.1 to measure the EC in two solutions: one with a nominal value of 0.5 S m-1 and the other, 5 mS m-1. This work aims to present a comparison among the values of the uncertainty results from primary EC measurement in the solution of 0.5 S m-1 obtained by using the methods of ISO GUM, Kragten and Monte Carlo simulation. In addition, this work will also present an evaluation of the uncertainty related to all relevant sources in the uncertainty budget for EC measurement by using the primary EC system from Inmetro. Moreover, this study intends to show the main points which should be focused on in order to improve the process of primary EC measurement, when needed.
- Keywords:
- uncertainty, electrolytic conductivity, primary measurements
- Download:
- IMEKO-TC24-2008-002.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC24
- Event name:
- MEFNM 2008 (TC24)
- Title:
- 1st IMEKO TC24 Conference (MEFNM 2008 - together with TC19 and TC23)
- Place:
- Budapest, HUNGARY
- Time:
- 10 September 2008 - 12 September 2008