Conductometric Determination of CO2in Air Samples

Abstract

Holm-Jensen, I. Conductometric Determination of CO₂ in Air Samples. Scand. J. clin. Lab. Invest. 36, 493–496, 1976. A new procedure enables the CO₂ concentrations of air samples to be determined and automatically registered. The CO₂ contents of the air samples are absorbed in an Sr(OH)₂ solution. The resulting decrease in electrical conductivity of the solution is automatically registered by a d.c. strip-chart recorder in such a way that the decline of the curve is proportional to the amount of CO₂ absorbed. In each analysis, quantities of CO₂ up to about 8 μmol can be determined with an error of less than 0.02 µmol, and, accordingly, CO₂ quantities of 2 to 8 µmol contained in samples of at least 150 ml of fresh atmospheric air or about 1 ml of carboxygen or expired air can be analysed with an accuracy of better than ±1.0% of their CO₂ content.