ISO 18218-2:2019
Leather — Determination of ethoxylated alkylphenols — Part 2: Indirect method
This document specifies a method for determining alkylphenols (nonylphenol and octylphenol) and alkylphenol ethoxylates (nonylphenol ethoxylate and octylphenol ethoxylate) in leather and process auxiliaries. The analysis is based on high-performance liquid chromatography (HPLC) or gas chromatography-mass spectrometry (GC-MS).
The analysis of the alkylphenol ethoxylate is made by cleaving the alkylphenol ethoxylate and measuring the released alkylphenol.
NOTE ISO 18218-1 and this document use different solvents for the extraction of the ethoxylated alkylphenols from leather. Consequently, the two analytical methods are expected to give similar trends but not necessarily the same absolute result for the ethoxylated alkylphenol content in leather.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and materials
6 Chemicals
7 Sampling and sample preparation
7.1 Preparation of leather samples
7.1.1 Sampling and preparation of samples
7.1.2 Sample extraction
7.2 Preparation of leather process auxiliary samples
7.3 Blank determination
7.4 Determination of OP and NP
7.5 Determination of OPEO and NPEO
7.6 Chromatographic analysis
7.7 Evaluation
8 Calibration
8.1 Calibration for OP and NP
8.2 Calibration for OPEO and NPEO
9 Calculation
9.1 Calculation of OP and NP
9.2 Calculation of OPEO and NPEO
10 Test report
Annex A (normative) Preparation of aluminium triiodide
Annex B (informative) Example of HPLC chromatograms
Annex C (informative) Example of GC-MS chromatograms
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and materials
6 Chemicals
7 Sampling and sample preparation
7.1 Preparation of leather samples
7.1.1 Sampling and preparation of samples
7.1.2 Sample extraction
7.2 Preparation of leather process auxiliary samples
7.3 Blank determination
7.4 Determination of OP and NP
7.5 Determination of OPEO and NPEO
7.6 Chromatographic analysis
7.7 Evaluation
8 Calibration
8.1 Calibration for OP and NP
8.2 Calibration for OPEO and NPEO
9 Calculation
9.1 Calculation of OP and NP
9.2 Calculation of OPEO and NPEO
10 Test report
Annex A (normative) Preparation of aluminium triiodide
Annex B (informative) Example of HPLC chromatograms
Annex C (informative) Example of GC-MS chromatograms
Bibliography