This part of GB/T 4497 specifies an oxygen combustion flask method for the determination of the total sulfur content of rubber.
The method is applicable for the determination of all the sulfur present in various rubber or rubber product, except that contained in barium sulfate. It is applicable to NR, CR, SBR, BR, IR, MR, EPDM, NBR and ebonite as well as the combination product of above rubbers.
This method gives unreliable (usually low) results in the presence of lead, antimony, zinc, barium and calcium compounds. If calcium carbonate is the only calcium compound present, good results can be obtained by modifying the absorbing solution.
2 Principle
A test sample is ignited in an atmosphere of oxygen in an oxygen combustion flask containing hydrogen peroxide, the carbon and hydrogen of the organic matter being oxidized and the sulfur being converted to sulfuric acid. If necessary, the resulting solution is passed through a cation-exchange column to remove interfering cations. The absorbing solution is titrated with barium perchlorate using thorin indicator or thorin and methylene blue indicator.
3 Reagents and Materials
Contents Foreword I 1 Scope 2 Principle 3 Reagents and Materials 4 Apparatus 5 Preparation of Test Sample 6 Safety Precautions 7 Procedure 8 Expression of Results 9 Test Report Appendix A (Informative) Oxygen Combustion Flask for Reference
Standard
GB/T 4497.1-2010 Rubber─Determination of total sulfur content—Part 1:Oxygen combustion flask method (English Version)
Standard No.
GB/T 4497.1-2010
Status
valid
Language
English
File Format
PDF
Word Count
4000 words
Price(USD)
100.0
Implemented on
2011-12-1
Delivery
via email in 1 business day
Detail of GB/T 4497.1-2010
Standard No.
GB/T 4497.1-2010
English Name
Rubber─Determination of total sulfur content—Part 1:Oxygen combustion flask method
1 Scope
This part of GB/T 4497 specifies an oxygen combustion flask method for the determination of the total sulfur content of rubber.
The method is applicable for the determination of all the sulfur present in various rubber or rubber product, except that contained in barium sulfate. It is applicable to NR, CR, SBR, BR, IR, MR, EPDM, NBR and ebonite as well as the combination product of above rubbers.
This method gives unreliable (usually low) results in the presence of lead, antimony, zinc, barium and calcium compounds. If calcium carbonate is the only calcium compound present, good results can be obtained by modifying the absorbing solution.
2 Principle
A test sample is ignited in an atmosphere of oxygen in an oxygen combustion flask containing hydrogen peroxide, the carbon and hydrogen of the organic matter being oxidized and the sulfur being converted to sulfuric acid. If necessary, the resulting solution is passed through a cation-exchange column to remove interfering cations. The absorbing solution is titrated with barium perchlorate using thorin indicator or thorin and methylene blue indicator.
3 Reagents and Materials
Contents of GB/T 4497.1-2010
Contents
Foreword I
1 Scope
2 Principle
3 Reagents and Materials
4 Apparatus
5 Preparation of Test Sample
6 Safety Precautions
7 Procedure
8 Expression of Results
9 Test Report
Appendix A (Informative) Oxygen Combustion Flask for Reference
