KF Coulometer determines water content in gases

Metrohm has developed a method to determine the moisture content of gases based on the ISO standard 10101: natural gas: determination of water by the Karl Fischer method.

The reproducible determination of water content is tricky as many gases contain only a few micrograms per litre of water.

The problem is the sample introduction, not the coulometric measurement.

An optimal measuring setup and the exact determination of the gas volume are vital in the lower ppm range.

Valves should be automated to ensure a reproducible gas introduction time.

The control of Tiamo titration software is also suitable for this purpose: by using a relay box, the valves can be opened and closed according to the conditioning or determination status of the coulometer.

In addition, the duration of the gas introduction is documented and can be used for calculating the gas volume.

The gas to be analysed is passed through the Karl Fischer titration cell in which the water is absorbed by the KF reagent and determined using Metrohm's 831 KF Coulometer.

The Metrohm method can also be used for other gases (for example nitrogen) that do not react with the Karl Fischer reagent.

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