Proficiency Test on Gasoil finished

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Download the report (iis11G01EN) of this Proficiency Test on Gasoil incl total contamination

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Summary of this proficiency test:

On 13 May 2011, the proficiency test on Gasoil (iis11G01EN) was finished. It started on 16 February 2011 (see message “Proficiency Test on Gasoil started” on this website) when the samples were distributed.

In this interlaboratory study 103 laboratories from 45 different countries have participated.

The participants were requested to determine Ash content, Cetane Index, Cloud Point, Cold Filter Plugging Point, Colour, Carbon Residue, Copper corrosion, Density, FAME content, Flash Point, Kinematic viscosity@40°C, Lubricity, Nitrogen, Pour Point, Solvent Yellow 124, Sulphur content,Total acid number, Water content, Distillation, Aromatics, Poly-aromatic hydrocarbon and total contamination. This all in agreement with the EN specification on automotive diesel.

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).