ISO 20921:2019
Textiles — Determination of stable nitrogen isotope ratio in cotton fibres
This document specifies the determination of the ratio of nitrogen isotopes in cotton fibres that are used for textile production. It applies not only to cotton textiles but also to raw cotton taken from cotton fields.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagent
6 Apparatus
7 Preparation
7.1 Sampling of test specimen
7.2 Pre-treatment of test specimen
8 Test procedure
8.1 Weighing of aliquot
8.1.1 Determination of weighing amount needed
8.1.2 General weighing procedure
8.2 Natural 15N abundance analysis
8.2.1 Instrumentation
8.2.2 General analytical procedure
9 Precision
10 Test report
Annex A (normative) Identification procedure of organic raw cotton fibres by using stable nitrogen isotope ratios
Annex B (informative) Analytical results of cotton fibres of various origin and process stage
Bibliography
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Related Information
Similar Standards
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AS/NZS 2450:1994
Textiles - Natural and man-made fibres - Generic names
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BS 2610:1978
Method of test for the determination of the cuprammonium fluidity of cotton and certain cellulosic man-made fibres
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BS 2889:1967
Method for the determination of trash content of cotton and for trash and lint content of waste intended for spinning, by the Shirley analyser
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BS 3181-1:1987
Methods for determination of cotton fibre properties by the airflow method, Determination of micronaire value by the single compression airflow method
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagent
6 Apparatus
7 Preparation
7.1 Sampling of test specimen
7.2 Pre-treatment of test specimen
8 Test procedure
8.1 Weighing of aliquot
8.1.1 Determination of weighing amount needed
8.1.2 General weighing procedure
8.2 Natural 15N abundance analysis
8.2.1 Instrumentation
8.2.2 General analytical procedure
9 Precision
10 Test report
Annex A (normative) Identification procedure of organic raw cotton fibres by using stable nitrogen isotope ratios
Annex B (informative) Analytical results of cotton fibres of various origin and process stage
Bibliography