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Download the report (iis13C09) of this Proficiency Test on Mixed Xylenes

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Summary of this proficiency test:

On 31 October 2013, the proficiency test on Mixed Xylenes (iis13C09) was finished. It started on 4 September 2013 (see message “Proficiency Test on Mixed Xylenes started” on this website) when the samples were distributed.

In this interlaboratory study 37 participants in 21 countries have participated.

The participants were asked to determine: benzene, Toluene, P/M/O Xylenes, Ethylbenzene, Cumene, sum of non aromatics, sum of C9 and heavier aromatics.

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, DIN, ASTM).