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- Title
Bubble extraction of dissolved gases from groundwater samples
- Authors
Walsh, Kayleen P.; McLaughlan, Robert G.
- Abstract
A technique is described for measuring the concentration of dissolved methane in water samples. A 250 microL 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.
- Subjects
MATHEMATICAL analysis; GROUNDWATER monitoring; GAS chromatography; WATER chemistry; METHANE
- Publication
Water, Air & Soil Pollution, 1999, Vol 115, Issue 1-4, p525
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1005102925436