|Proficiency Test on Naphtha finished
The full report can be downloaded (as .pdf-file). To download the report, please click the right mouse button and choose the "save as" option.
Summary of this proficiency test:
On 10 June 2010, the proficiency test on Naphtha (iis10N01) was finished. It started on 17 March 2010 (see message “Proficiency Test on Naphtha started” on this website) when the samples were distributed.
In this international interlaboratory study 78 participants in 31 different countries have participated.
The participants were requested to determine Colour Saybolt, Copper Corrosion 3hrs@50°C , Density @ 15 °C, Distillation, Mercaptans, Sulphur, Organic chlorides as Cl, Methanol, Methyl tert-butyl ether, DIPE, TAME, MEK, ACETONE, Total Oxygenates, PIONA, Mercury as Hg, Arsenic as As,Lead as Pb, Total Vapour Pressure and DVPE .
The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated by i.i.s. 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).
Interested parties can order a hard copy of the report; the price for non-participants is Euro 35.