Method and measuring device for determining the CO2 concentration in a CO2-containing liquid

摘要

The invention relates to a method for determining the CO₂ concentration in a CO₂-containing liquid, in particular CO₂-containing (soft) drinks.;The invention also relates to a measuring device for determining the CO₂ concentration in a CO₂-containing liquid, in particular CO₂-containing (soft) drinks.;According to the invention, the method is characterized by the steps ofa) providing a predetermined amount of CO2-containing liquid with a predetermined volume of a head gas that is in gas equilibrium with the liquid;b) determining the total pressure of the head gas;c) determining the partial pressure of oxygen (O2) of the head gas;d) determining the partial pressure of nitrogen (N2) of the head gas;e) deriving the partial pressure of carbon dioxide (CO2) of the head gas from the total pressure and the partial pressures of oxygen and nitrogen; andf) deriving the CO2 concentration in the CO2-containing liquid from the derived partial pressure of carbon dioxide.