|Proficiency Test on Vacuum Gasoil (VGO) finished
The full report can be downloaded (as .pdf-file). To download the report, please click the right mouse button and choose the "save as" option.
Summary of this proficiency test:
On 14 February 2014, the proficiency test on VGO (iis13G06) was finished.
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).