|Proficiency Test on
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Summary of this proficiency test:
On 29 October 2015, the proficiency test on Methanol (iis15C08) was finished. It started on 19 August 2015 (see message “Proficiency Test on Methanol started” on this website) when the samples were distributed.
In this interlaboratory study 84 participants in 30 different countries have participated.
The participants were requested to determine Appearance, Purity, Colour Pt/Co, Water, Distillation range @760 mmHg, Density @20°C, Specific gravity 20/20, Permanganate time test @15°C, Carbonisable substances, Ethanol, Chloride, Sulfur, Acidity, Total iron, Nonvolatile Matter, Trimethylamine, Miscibility (water), Acetone, Benzene, Toluene and UV absorbance.
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).