Proficiency Test on Gasoline finished

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Download the report (iis10B03) of this Proficiency Test on Gasoline incl. DVPE.

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Summary of this proficiency test:

On 10 January 2010, the proficiency test on Gasoline(iis10B03) was finished. It started on 29 September 2010 (see message “Proficiency Test on Gasoline started” on this website) when the samples were distributed.

In this international interlaboratory study 98 participants in 45 different countries have participated.

The participants were requested to determine Aromatics, API gravity, Benzene, Copper strip 3hrs/50ºC, Distillation, Doctor test, Density @15ºC, Existent gum (washed), olefins, aromatics, Appearance, Mn, Oxyganates, Sulphur, VLI, Oxidation Stability, RON/MON, Total vapour pressure and DVPE.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated by i.i.s. 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).

Interested parties can order a hard copy of the report; the price for non-participants is Euro 35.