Proficiency Test on VGO finished

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Download the report (iis14G06) of the Proficiency Test on VGO.

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Summary of this proficiency test:

On 7 April 2015, the proficiency test on VGO (iis14G06) was finished. The PT started 19 November 2014(see message “Proficiency Test on VGO started” on this website) when the samples were distributed.

In this interlaboratory study 52 participants in 27 different countries have participated.

The participants were requested to determine Total Acid Number,Aniline Point, Asphaltenes, Density @ 15°C, Carbon Residue, Flash Point PMcc, Kinematic viscosity @ 50°C, Kinematic viscosity @ 100°C,MCR, Nitrogen, Total Sulphur Content, Simdist, As, Ca, Cu, Fe, Ni, Na, Si, and V and Distillation

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, ASTM, EN).