Table 2.

Natural gas components and range of composition covered by ASTM D 1945-14. The ranges listed are for the method and not the acceptable ranges for commercial natural gas. Components are listed in order of retention times.

Component	Mol %
helium	0.01 to 10
hydrogen	0.01 to 10
oxygen	0.01 to 20
nitrogen	0.01 to 100
carbon dioxide	0.01 to 20
methane	0.01 to 100
ethane	0.01 to 100
hydrogen sulfide	0.3 to 30
propane	0.01 to 100
isobutane	0.01 to 10
n-butane	0.01 to 10
neopentane	0.01 to 2
isopentane	0.01 to 2
n-pentane	0.01 to 2
hexane isomers	0.01 to 2
heptanes+	0.01 to 1