Proficiency Test on Vacuum Gasoil (VGO) finished

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Download the report (iis13G06) of this Proficiency Test on VGO

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Summary of this proficiency test:

On 14 February 2014, the proficiency test on VGO (iis13G06) was finished.
It started on 14 November 2013 (see message "Proficiency Test on VGO started" on this website) when the samples were distributed.

In this interlaboratory study 34 participants in 20 different countries have participated.

The sample was tested on Acid Number, Aniline Point, Asphaltenes, Density @ 15°C, Distillation (IBP, 10% rec, 30% rec, 50% rec, 70% rec, 90% rec and FBP), Flash Point PMcc, Kinematic Viscosity @ 50°C and @ 100°C, Micro Carbon Residue, Nitrogen, Total Sulphur Content and Metals (Arsenic, Calcium, Copper, Nickel, Iron, Silicon, Sodium, Vanadium).

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, IP, ASTM).