Superseding
Chinese Name	Natural Gas - Determination of Sulfur Compounds - Part 7: Determination of Total Sulfur Content by L
English Name
Chinese Standard Classification
Professional Classification
ICS Classification
Issued on	December 30, 2011
Implemented on	June 1, 2012
Abolished on
Issued by	AQSIQ and SAC
Chinese Pages
Word Count	3500 words

1  Scope

This Part of GB/T 11060 specifies a method for the determination of total Sulfur in natura1 gas.
This Part is applicable to gases with Sulfur contents between 0.5 mg/m3 and 1 000 mg/m3. With a total Sulfur content of more than 0.1 mg Sulfur in the absorption Solution, visual titration with an indicator tan be Chosen, whereas for lower contents turbidimetric titration is preferable.

2  Normative References

The following Standards contain provisions which, through reference in this text, constitute provisions of this Part of GB/T 11060. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 12805  Laboratory Glassware - Burettes (GB/T 12805-1991, eqv ISO 385-1:1984)
GB/T 12806  Laboratory Glassware - One-mark Volumetric Flasks (GB/T 12806-1991, eqv ISO 1042:1983)
GB/T 12808  Laboratory Glassware - One-mark Volumetric Pipettes (GB/T 12808-1991, eqv ISO 648:1977)
GB/T 13609  Natural Gas - Sampling Guidelines (GB/T 13609-1999, eqv ISO 10715:1997)
HG/T 3115-1998  Borosilicate Glass 3.3 - Properties (HG/T 3115-1998, idt ISO 3585:1991)

3  Principle

A measured volume of gas is burnt with air at atmospheric pressure in a glass combustion apparatus. The resulting Sulfur oxides are converted into sulfuric acid by absorption in hydrogen peroxide solution. Depending on the Sulfur content of the test gas, the sulfate ions in the absorption Solution are determined using either visual titration with an indicator or turbidimetric titration.

4  Reagents and Materials

During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity.
4.1  Hydrogen Peroxide, 10 % (m/m) aqueous Solution, Sulfur-free, as absorbing liquid for the Sulfur oxides.
4.2  Activated carbon, for adsorption of Sulfur impurities from the combustion air.
4.3  Absorbing liquid: 30 % (m/m) aqueous Solution of potassium hydroxide, for the purification of the combustion air.