Proficiency Test on o- and p-Xylenes finished

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Download the report (iis10C09) of this Proficiency Test on O-P-Xylenes

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Summary of this proficiency test:

On 15 November 2010, the proficiency test on o- and p-Xylenes (iis09C10) was finished. It started on 8 September 2010 (see message “Proficiency Test on o- and p-Xylenes started” on this website) when the samples were distributed.

In this interlaboratory study 28 participants in 19 different countries have participated.

The participants were asked to determine: Purity (and GC impurities), Appearance, Colour, Density, Distillation, Organic Chloride and Sulphur.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated by i.i.s. 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).

Interested parties can order a hard copy of the report; the price for non-participants is Euro 35.