An instrument for the continuous determination of carbon dioxide in high purity water

Abstract

An instrument for the continuous determination of carbon dioxide in high purity water is described. The instrument consists essentially of a device for transferring the carbon dioxide from the water to a gas stream, which is then passed through an aqueous suspension of calcium carbonate. The pH of this suspension, which is proportional to the concentration of carbon dioxide in the gas stream and hence the original water, is recorded continuously.

Precision tests at levels of 20 and 60 µg per litre had a standard deviation of about 4 µg per litre.