In the framework of JRP ENV01 "Metrology for Chemical Pollutants in Air" (MACPoll) an interlaboratory comparison was organized to evaluate the comparability between different dilution methods used for generating standard gas mixtures for calibration, quality control... The results of this interlaboratory comparison show that for SO2 at 40 and 150 nmol/mol the degrees of equivalence which are around 5% don't satisfy the requirement of 2% set within this JRP for all participant laboratories except LNE. It was also observed positive deviations between the standard amounts of substance fraction (LNE) and the amounts of substance fraction measured by the participants.
LNE proposes a comparison for SO2 at 100 nmol/mol to understand and improve the results obtained in the EMRP project MACPoll.
Final Report 2016-05-01
The project has been completed and the report can be downloaded here>>