Proficiency Test on MPG finished

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Download the report (iis13C11) of this Proficiency Test on MPG.

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Summary of this proficiency test:

On 13 January 2014, the proficiency test on MPG (iis13C11) was finished. It started on 9 October 2013 (see message “Proficiency Test on MPG started” on this website) when the samples were distributed.

In this interlaboratory study 19 participants in 11 different countries have participated.

The participants were requested to determine Acidity as acetic acid, Appearance, Colour Pt/Co, Chloride, Di Propylene Glycol, Water, Iron, Purity, Density at 20 °C, Specific Gravity 20/20°C and Distillation.

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).