| http://www.w3.org/ns/prov#value | - As well as the target natural gas (mostly methane plus propane, butane, and ethane), the flowback water contains other gases such as carbon dioxide, hydrogen sulphide, nitrogen and helium; naturally-occurring brine, trace elements of mercury, arsenic and lead; naturally occurring radioactive material (radium, thorium, uranium); and volatile organic compounds that easily vaporise into the air, such
|
