Method RSK SOP-175
Dissolved Gas Analysis in Water Samples Using a GC Headspace Equilibration Technique
This method is for the collection and analysis of dissolved gases such as methane, ethane and ethylene in ground water. A water sample is collected in a bottle with no headspace. After sample collection, a headspace is generated in the sample by displacing a specific percentage of the water with high purity helium. The bottle is shaken until an equilibrium is established and then the headspace is direct injected onto a gas chromatograph with a thermal conductivity detector (TCD), flame ionization detector (FID) or electron capture detector (ECD).
The concentration of the dissolved gases in the sample is determined by using Henry’s law constant (H) for the target analyte, the concentration of the gas in the headspace, the bottle volume, the sample temperature, and the amount of headspace injected.
–RSKSOP-175:Dissolved Gas Analysis in Water Samples Using a GC Headspace Equilibration Technique, Revision No.2, May 2004
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