scope:

This part of ISO 6326 specifies a method a gas chromatographic method for the qualitative and quantitative analysis of odoriferous sulphur compounds in naturel 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: - hydrogen sulphide; - methanethiol and homologues up to butanethiols; - thiacyclopentane. It is not applicable for the determination of carbonyl sulphide. Under normal conditions of applications, 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.