Determination of CO₂ in packaged beer by a manual pressure/temperature (P/T) method – determination of the repeatability and reproducibility

Submitted on behalf of the Analysis Committee of the European Brewery Convention

Abstract

The determination of CO₂ in packaged beer by a manual pressure/temperature (P/T) method was collaboratively tested by the Analysis Committee of the European Brewery Convention according to ISO Standard 5725 in order to determine its suitability for publication in Analytica-EBC. Repeatability (r₉₅) and reproducibility (R₉₅) values are presented.

Repeatability (r₉₅) was found to be independent on the mean value and was 0,12 g/l over the range 4,8 to 7,0 g/l. Reproducibility (R₉₅) was found to be dependent on the mean and was 0,089m g/l over the range of CO₂ tested.

The method has acceptable repeatability and reproducibility and is recommended for inclusion in Analytica-EBC.

At the same time an instrumental thermal conductivity method using the Micro Logger 3654 analyzer from Hach Ultra Analytics was also collaboratively tested in order to determine its repeatability (r₉₅) and reproducibility (R₉₅) values.

Repeatability (r₉₅) was found to be independent on the mean value and was 0,08 g/l over the range 4,7 to 6,9 g/l. Reproducibility (R₉₅) was found to be dependent on the mean and was 0,054m g/l over the range of CO₂ tested.

The instrumental thermal conductivity using the Micro Logger 3654 analyzer from Hach Ultra Analytics is also recommended for inclusion in Analytica-EBC.