Proficiency Test on Gasoil finished

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Download the report (iis11G04, including CN, OX and TC) of this Proficiency Test on Gasoil.

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Summary of this proficiency test:

On 14 December 2011, the proficiency tests on Gasoil (iis11G04ASTM), Cetane Number (iis11G04CN), oxidation stability (iis11G04OX) and total contamination (iis11G04TC) were finished. The PTs all started on 14 September 2011 (see message “Proficiency Test on Gasoil started” on this website) when the samples were distributed.

In these interlaboratory studies 172 participants in 72 different countries have participated.


The participants were requested to determine Acid number, Ash content, Aromatics by FIA, Cetane Index, Ramsbottom Carbon Residue , Copper corrosion, Density, Distillation, Flash Point, Kinematic viscosity @40°C, Sulphur, CFPP, Cloud Point, Colour, Lubricity, Nitrogen, Pour Point, Water, Cetane Number, oxidation stabillity and total contamination.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated for each participant are tabulated. Also, for each test, the calculated summary (e.g. mean, standard deviation and reproducibility) is given.

In the report also an evaluation of the test results is given. Problems encountered in the analyses are mentioned and - where possible - suggestions for quality improvement are formulated. For each test a comparison is made between the results of the group of participants and the requirements given by the relevant standard (e.g. ISO, DIN, ASTM).