ISO 20163:2019
Vulcanized rubber — Determination of free sulfur by gas chromatography (GC) and high performance liquid chromatography (HPLC)
This document specifies chromatographic methods for the determination of the inorganic free sulfur (Sx) not consumed during the vulcanization of the rubber. This method is used primarily to compare the free sulfur content in different samples.
NOTE 1 In this document, "free sulfur" is used instead of "inorganic free sulfur".
NOTE 2 The residual curing agent containing sulfur is not concerned by this measure.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Reagents and materials
6.1 Standard solutions
6.2 Materials for preparation of samples
6.3 Reagents used in GC
6.4 Elution solvents used in HPLC
7 Preparation of standard solutions and calibration curves
7.1 Standard addition method
7.2 External calibration method
8 Preparation of samples
9 Chromatographic procedure
9.1 Method A by GC procedure
9.2 Method B by HPLC procedure
9.2.1 General
9.2.2 Standard addition method
9.2.3 External calibration method
10 Sample analysis and calculation
10.1 General
10.2 Calculation using standard addition method
10.3 Sample analysis and calculation using external calibration method
11 Precision
12 Test report
Annex A (normative) Calibration using standard addition method
Annex B (normative) Calibration using external standard solutions
Annex C (informative) Examples of chromatogram
Annex D (informative) Precision
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Reagents and materials
6.1 Standard solutions
6.2 Materials for preparation of samples
6.3 Reagents used in GC
6.4 Elution solvents used in HPLC
7 Preparation of standard solutions and calibration curves
7.1 Standard addition method
7.2 External calibration method
8 Preparation of samples
9 Chromatographic procedure
9.1 Method A by GC procedure
9.2 Method B by HPLC procedure
9.2.1 General
9.2.2 Standard addition method
9.2.3 External calibration method
10 Sample analysis and calculation
10.1 General
10.2 Calculation using standard addition method
10.3 Sample analysis and calculation using external calibration method
11 Precision
12 Test report
Annex A (normative) Calibration using standard addition method
Annex B (normative) Calibration using external standard solutions
Annex C (informative) Examples of chromatogram
Annex D (informative) Precision
Bibliography