Proficiency Test on Gasoil finished

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Download the report (iis14G01, including TC) of this Proficiency Test on Gasoil.

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Summary of this proficiency test:

On 1 May 2014, the proficiency tests on Gasoil iis14G01ASTM was finished. The PTs all started on 19 February 2014 (see message "Proficiency Test on Gasoil started" on this website) when the samples were distributed.

In these interlaboratory studies 170 participants in 58 different countries have participated.


The participants were requested to determine Ash content, Cetane Index, Carbon residue, Cloud Point, CFPP, copper corrosion, Density @ 15C, Flash Point PMcc, FAME content, Kinematic viscosity @40C, Lubricity by HFRR, Nitrogen, Manganese content, PAH, pour point, Sulphur content, Total acid number, Water content, total contamination and Distillation at 760 mmHg.

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).