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The measurement of dissolved gases such as methane, ethane, and ethylene in ground water is important in determining whether intrinsic bioremediation is occurring in a fuel-or solventcontaminated aquifer. A simple procedure is described for the collection and subsequent analysis of ground water samples for these analytes. A helium headspace is generated above a waterfilled bottle. Gases that are dissolved in the water partition between the gas and liquid phases and equilibrate rapidly. Andoi:10.1093/chromsci/36.5.253 pmid:9599433 fatcat:q66k6po6kvcqho5sjthorciwra