|Proficiency Test on Natural Gas 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 6 June 2014, the proficiency test on Natural Gas (iis14S01M) was finished. It started on 25 February 2014 (see message "Proficiency Test on Natural Gas started" on this website) when the samples were distributed.
In this interlaboratory study 43 laboratories in 27 different countries have participated.
The participants were requested to determine Methane, Ethane, Propane, n-Butane, iso-Butane, Carbon dioxide, Nitrogen, Calculated parameters @ 25°C and 101.325 KPa, Caloric Value (sup), Density, Relative Density, Wobbe index.
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).