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Inter-laboratory comparison scheme for fuel sector, LABKAR in Turkey

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Abstract

Fuel sector is one of the powerful sectors in Turkish industry. The implementation of a new law for regulating the fuel sector had enforced the quality control of fuels sold to public. This resulted in several accredited fuel-testing laboratories to emerge. Thus, a scheme to evaluate their proficiency in measurements became an important requirement. The inter-laboratory comparison scheme LABKAR for gasoline, diesel oil, LPG, lubricating oil and biodiesel samples have evolved to fulfill this need. In this paper, LABKAR is introduced; the results obtained from the program are analyzed and discussed. The kernel densities of the participants’ results show that the use of robust mean as a consensus value is appropriate for fuel samples. Although the number of rounds is not enough to derive strict conclusions, it is seen that the performance of the scheme based on the standard deviations and coefficient of variations is improving in each round. It has been observed that the number of laboratories receiving “action” or “warning” is decreasing, which indicates that they are benefiting from the scheme.

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Acknowledgments

Thanks are due to the Reviewers and the Editor for their valuable comments. We are very grateful to Emine Kavdır and Ezgi Özkılıç for their help in the course of developing the LABKAR scheme.

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Authors and Affiliations

  1. Industrial Engineering Department, Çankaya University, Öğretmenler Caddesi, No:14, 100, Yıl, 06530, Ankara, Turkey

    Özlem Türker Bayrak

  2. Petroleum Research Center, Middle East Technical University, Ankara, Turkey

    Ender Okandan & Hale Üçkardeş

Authors
  1. Özlem Türker Bayrak
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  2. Ender Okandan
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  3. Hale Üçkardeş
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Correspondence to Özlem Türker Bayrak.

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Türker Bayrak, Ö., Okandan, E. & Üçkardeş, H. Inter-laboratory comparison scheme for fuel sector, LABKAR in Turkey. Accred Qual Assur 14, 497–502 (2009). https://doi.org/10.1007/s00769-009-0542-7

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  • DOI: https://doi.org/10.1007/s00769-009-0542-7

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