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Download the report (iis08G01X) of this Proficiency Test on Gasoil

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Summary of this proficiency test:

On 19 May 2008, the proficiency test on Gasoil (iis08G01) was finished. It started on 6 February 2008 (see message “Proficiency Test on Gasoil started” on this website) when the samples were distributed.

In this international interlaboratory study 80 participants in 41 different countries have participated.

The participants were requested to determine Ash content, Cetane index (ASTM D976 and D4737), Cloud point, Cold filter plugging point (CFPP), Colour, Conradson carbon residue (CCR), Copper Corrosion 3hrs., Density @15°C, Distillation, Flash Point PMcc, Kinematic viscosity @20°C, Lubricity, Nitrogen, Pour Point, Sulphur content, Total acid number, Water content and Aromatics (mono-, di-, tri- and poly-) and Solvent Yellow.

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.