Proficiency Test on MTBE finished

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Download the report (iis15C03) of the Proficiency Test on MTBE.

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Summary of this proficiency test:

On 3 April 2015, the proficiency test on MTBE (iis15C03) was finished. The PT started 21 January 2015 (see message “Proficiency Test on MTBE started” on this website) when the samples were distributed.

In this interlaboratory study 23 participants in 13 different countries have participated.

The participants were requested to determine Appearance, Carbonyls, Refractive Index, Methanol , Diisobutylene , Tert.Butanol, Hydrocarbons Other impurities, Purity, Density @ 20°C and Water

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, ASTM, EN).