ISO 11337:2023
Plastics — Polyamides — Determination of ε-caprolactam and ω-laurolactam by gas chromatography
This document specifies a method for determining ε‑caprolactam and ω‑laurolactam in polyamides by gas chromatography. It is applicable particularly to the determination of ε‑caprolactam in polyamide 6 and ω‑laurolactam in polyamide 12.
Two variants of the basic method are specified.
— Method A is an extraction method with boiling methanol, and the extract is injected into a gas chromatograph.
— Method B is a method using a solvent, and the solution is injected into a gas chromatograph.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Method A: Extraction method
4.1 Principle
4.2 Reagents
4.3 Apparatus and materials
4.4 Preparation of test sample
4.5 Procedure
4.5.1 Test portion
4.5.2 Extraction
4.5.3 Preparation of internal-standard solution
4.5.4 Preparation of sample solution
4.5.5 Preparation of calibration solution
4.5.6 Gas-chromatographic analysis of sample and calibration solutions
4.5.7 Evaluation of gas chromatographic peaks
4.6 Expression of results
4.7 Precision
4.8 Test report
5 Method B: Dissolution method
5.1 Principle
5.2 Reagents
5.3 Apparatus
5.4 Preparation of internal-standard solutions
5.4.1 General
5.4.2 Internal standard for unextracted polyamide 6
5.4.3 Internal standard for extracted polyamide 6
5.4.4 Internal standard for polyamide 12
5.4.5 Preparation of calibration solutions
5.4.6 Calibration
5.5 Procedure
5.5.1 Preparation and injection of sample solution
5.5.2 Evaluation of gas-chromatographic peaks
5.5.3 Solvent recovery
5.6 Expression of results
5.7 Precision
5.8 Test report
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Method A: Extraction method
4.1 Principle
4.2 Reagents
4.3 Apparatus and materials
4.4 Preparation of test sample
4.5 Procedure
4.5.1 Test portion
4.5.2 Extraction
4.5.3 Preparation of internal-standard solution
4.5.4 Preparation of sample solution
4.5.5 Preparation of calibration solution
4.5.6 Gas-chromatographic analysis of sample and calibration solutions
4.5.7 Evaluation of gas chromatographic peaks
4.6 Expression of results
4.7 Precision
4.8 Test report
5 Method B: Dissolution method
5.1 Principle
5.2 Reagents
5.3 Apparatus
5.4 Preparation of internal-standard solutions
5.4.1 General
5.4.2 Internal standard for unextracted polyamide 6
5.4.3 Internal standard for extracted polyamide 6
5.4.4 Internal standard for polyamide 12
5.4.5 Preparation of calibration solutions
5.4.6 Calibration
5.5 Procedure
5.5.1 Preparation and injection of sample solution
5.5.2 Evaluation of gas-chromatographic peaks
5.5.3 Solvent recovery
5.6 Expression of results
5.7 Precision
5.8 Test report