| Autor: |
Elias Kakoulides, Rodrigo Caciano de Sena, Yu. A. Kustikov, Gabriel F. Sarmanho, David Saxby, Janaína Marques Rodrigues, Pranee Phukphatthanachai, Oktay Cankur, Guillaume Labarraque, Olaf Rienitz, Tao Zhou, Suleyman Z Can, Werickson Fortunato de Carvalho Rocha, Charun Yafa, Reinhard Jaehrling, Yanbei Zhu, Leonid Konopelko, Lindomar Augusto dos Reis |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Metrologia. 51:08013-08013 |
| ISSN: |
1681-7575 |
| DOI: |
10.1088/0026-1394/51/1a/08013 |
| Popis: |
The increase in renewable sources in the energy matrix of the countries is an effort to reduce dependency on crude oil and the environmental impacts associated with its use. In order to help overcome the lack of widely accepted quality standards for fuel ethanol and to guarantee its competitiveness in the international trade market, the NMIs have been working to develop certified reference materials for bio-fuels and measurement methods. Inorganic impurities such as Cu, Na and Fe may be present in the fuel ethanol and their presence is associated with corrosion and the formation of oxide deposits in some engine parts. The key comparison CCQM-K100 was carried out under the auspices of the Inorganic Analysis Working Group (IAWG) and the coordination of the National Institute of Metrology, Quality and Technology (INMETRO). The objective of this key comparison was to compare the measurement capabilities of the participants for the determination of Cu in fuel ethanol. Ten NMIs participated in this exercise and most of them used the isotopic dilution method for determining the amount of Cu. The median was chosen as key comparison reference value (KCRV). The assigned KCRV for the Cu content was 0.3589 ?g/g with a combined standard uncertainty of 0.0014 ?g/g. In general, there is a good agreement among the participants' results. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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