Proficiency Test on Liquefied Butane finished

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Download the revised final report (iis14S02B) of the 2014 Proficiency Test on Liquefied Butane

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Summary of this proficiency test:

On 31 July 2014, the proficiency test on Liquefied Butane (iis14S02B) was finished. It started on 28 May 2014 (see message "Proficiency Test on Liquefied Butane started" on this website) when the samples were distributed.

In this interlaboratory study 41 participants in 25 different countries have participated.

The participants were requested to determine Propane, Propylene, n-Butane, 1,3-Butadiene, iso-Butylene, 1-Butene, trans-2-Butene, cis-2-Butene, iso-Pentane, iso-Butane, Molar Mass, Relative Density @60F and Vapour pressure @100F.

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. EN, ASTM).