Proficiency Test on O-& P- Xylenes 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.

Download the report (iis14C08) of this Proficiency Test on Mixed Xylenes

For viewing the report you will need Adobe Acrobat Reader getacro.gif (712 bytes)


Summary of this proficiency test:

On 17 December 2014, the proficiency test on O-& P- Xylenes(iis14C08) was finished. It started on 24 September 2014 (see message “Proficiency Test on O-& P- Xylenesstarted” on this website) when the samples were distributed.

In this interlaboratory study 35 participants in 20 countries have participated.

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

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).