Chromatotec Group

Analysis of mercaptans (DMS, DMDS) in air or water - « Purge & Trap » (Range 0.02 to 10 ppb)

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Source: Chromatotec Group

Chromatotec analyzes sulphur compounds in gaseous form in the sea water or the air with a device which has a sulfur specific detector.

It allows in particular the measurement of dimethyl sulphide (DMS), volatile sulphur compound of biogenic origin, produced in 90 % in the oceans and which would be involved in the regulation of the greenhouse effect (concentration around 50 ppt).

The analysis of DMS requires a sensitive method. First, the sulphur compound must be concentrated before being analysed by Gas Chromatography. This step of pre-concentration is realised on a cooled trap (sampled volume ≈ 200 ml) after the purge of DMS.

The DMS is then thermo-desorbed, injected into the column and analysed by the specific detector.

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