This test method covers the determination of the dissolved gases methane, ethane, ethylene and propane in drinking, waste, and ground waters, including domestic wells. Dissolved gases in water can be analyzed up to the saturation concentration. If the water is super saturated at one atmosphere and 25C with a target dissolved gas, the sample would require dilution. This test method has an analytical range from 10 g/L to 11000 g/L for methane, and 10 g/L to 5000 g/L for ethane, ethylene and propane.
Hydraulic fracturing in conjunction with horizontal drilling to tap natural gas reservoirs has sometimes caused issues with dissolved gas contamination of drinking water. Dissolved gases can be hazardous both to the environment and to humans. The Robert S. Kerr EPA lab developed a standard operating procedure, RSK-175; to test for dissolved gases through static headspace sampling. However, as these compounds are extremely volatile, a closed sampling system is required. Furthermore, RSK-175 is a standard operating procedure and not a formal method; thus, testing procedures for dissolved gases have had a wide range of implementations. This standard is being proposed to determine quantitatively dissolved gases in both ground and drinking water reservoirs.
Keywordsdissolved gas; headspace; flame ionization; ground water; drinking water; domestic well water; methane; ethane; ethylene; propane; light hydrocarbons; aqueous; RSK-175
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top