METAS results agree within less than 2% relative to the assigned reference values except for benzene (underestimation of 3%). LNE results agree within less than 2% relative to the assigned reference values except for o-xylene (underestimation of 4%). Generally, all laboratories have shown good reproducibility of the results for the five compounds. To conclude, in most cases, measurements of benzene, toluene, ethylbenzene, and o-xylene by each of the participating laboratories on the two sorbent types (Carbopack X and Tenax TA) agree within 5% of the assigned reference values. This EURAMET comparison demonstrates very good comparability between institutes. It can be also interesting to note that according to laboratories, analytical uncertainties are very different. METAS gets the lowest uncertainties and yet they generally agree well with the assigned reference values.
METAS results agree within less than 2% relative to the assigned reference values except for benzene (underestimation of 3%). LNE results agree within less than 2% relative to the assigned reference values except for o-xylene (underestimation of 4%). Generally, all laboratories have shown good reproducibility of the results for the five compounds. To conclude, in most cases, measurements of benzene, toluene, ethylbenzene, and o-xylene by each of the participating laboratories on the two sorbent types (Carbopack X and Tenax TA) agree within 5% of the assigned reference values. This EURAMET comparison demonstrates very good comparability between institutes. It can be also interesting to note that according to laboratories, analytical uncertainties are very different. METAS gets the lowest uncertainties and yet they generally agree well with the assigned reference values.
EURAMET-P1192_METCHEM_Final_Report.docx