Proficiency Test on Styrene finished

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Download the report (iis11C08) of this Proficiency Test on Styrene.

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Summary of this proficiency test:

On 18 November 2011, the proficiency test on Styrene(iis11C08) was finished. It started on 7 September 2011 (see message “Proficiency Test on Styrene started” on this website) when the samples were distributed.

In this interlaboratory study 33 participants in 19 countries have participated.

The participants were requested to determine Aldehydes as benzaldehyde, Appearance, Colour Pt/Co, Inhibitor, Density at 20ºC, Peroxides, Polymer, Organic Chloride, Sulphur, Purity, Water and Impurities.

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).