3ISO 19739-2004 Natural Gas-Determination of sulfur compounds using gas chromatography[S].
4ASTM D5504-08. Standard test method for determination of sulfur compounds in natural gas and gaseous fuels by gas chromatography and chemiluminescence[S].
5ASTM D6228-98. Standard test method for determination of sulfur compounds in natural gas and gaseous fuels by gas chromatography and flare photometric detection[S].