Metrohm method determines water content of gases

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

The reproducible determination of water content is said to be difficult as many gases usually only contain a few nanograms per litre of water.

An optimal measuring setup and the exact determination of the gas volume are the most important elements of water determination in the lower parts-per-million range.

In order to ensure a reproducible gas introduction time, the control of the valves should be automated, according to the company.

The 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.

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 is then determined using Metrohm's 831 KF coulometer.

In addition to natural gas, the Metrohm method can also be used for other gases (such as nitrogen) that do not react with the Karl Fischer reagent.

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