Bubble extraction of dissolved gases from groundwater samples

Publication Type:
Journal Article
Water, Air, and Soil Pollution, 1999, 115 (1-4), pp. 525 - 534
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A technique in described for measuring the concentration of dissolved methane in water samples. A 250 μL bubble is injected into a 5 mL vial to create a headspace. The headspace gas is subsequently analysed by gas chromatograph. The technique requires a headspace equilibrium time of at least 13 hours. The extraction efficiency of the method for methane saturated water was 101.9% ± 1%. The technique is applicable to other dissolved gases in groundwater. The method was used during a comparative evaluation of groundwater sampling devices at a field site. It was found that low flow rate sampling with either a Grundfos electric submersible pump or a peristaltic pump were more precise than using a bailer to measure dissolved methane.
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