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 CO 2 concentration in a CO 2 -containing liquid, in particular CO 2 -containing (soft) drinks. The invention also relates to a measuring device for determining the CO 2 concentration in a CO 2 -containing liquid, in particular CO 2 -containing (soft) drinks. According to the invention, the method is characterized by the steps of
a) providing a predetermined amount of CO 2 -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 (O 2 ) of the head gas;
d) determining the partial pressure of nitrogen (N 2 ) of the head gas;
e) deriving the partial pressure of carbon dioxide (CO 2 ) of the head gas from the total pressure and the partial pressures of oxygen and nitrogen; and
f) deriving the CO 2 concentration in the CO 2 -containing liquid from the derived partial pressure of carbon dioxide.