This part of ISO 6326 specifies a gas chromatographic method for the qualitative and quantitative analysis of odoriferous sulphur compounds in natural gas.
Sulphur compounds may occur naturally in natural gas and remain as traces after treatment, or they may have been injected deliberately to allow subsequent olfactory detection.
The method is applicable to the following compounds:
It is not applicable for the determination of carbonyl sulphide.
Under normal conditions of application, this method can be used to determine the content of each compound within a concentration range from 0,1 to 100 mg (concentration expressed in milligrams of sulphur) per cubic metre of gas at standard pressure and temperature.
The detector used is not sensitive to the major components of natural gases.
NOTE 1 The chromatographic conditions described enable hydrogen sulphide and methanethiol to be determined if the ratio of the concentration of the former to the concentration of the latter is less than 10. The same applies for two thiols eluted consecutively. The resolution of the chromatographic column can be improved to increase this ratio.
NOTE 2 The method can also be used to determine the contents of
NOTE 3 See the bibliography concerning the method described in this International Standard.
