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Download the report (iis11R02) of this Proficiency Test on Crude Oil Assay D2892

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Summary of this proficiency test:

On 27 February 2012, the proficiency test on Crude Oil Assay D2892 (iis11R02) was finished. It started on 19 October 2011 (see message “Proficiency Test on Crude Oil Assay D2892 started” on this website) when the samples were distributed.

In this interlaboratory study 21 participants in 15 different countries have participated.

All distillation fractions were tested on density, sulfur and nitrogen. Also simdist, PNA (PIONA) and D86 were performed on selected distillation fractions.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and a number of z-scores 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 ASTM standard.