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.

Textiles — Détermination du rapport isotopique stable de l'azote dans les fibres de coton

General Information

• Status: Published
• Publication Date: 30-Jan-2019
• ICS: 59.060.10 - Natural fibres
• Technical Committee: ISO/TC 38 - Textiles
• Drafting Committee: ISO/TC 38/WG 31 - Natural material for textiles
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20921
First edition
2019-02
Textiles — Determination of stable
nitrogen isotope ratio in cotton fibres
Textiles — Détermination du rapport isotopique stable de l'azote
dans les fibres de coton
Reference number
ISO 20921:2019(E)
©
ISO 2019

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ISO 20921:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 20921:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagent . 2
6 Apparatus . 2
7 Preparation . 3
7.1 Sampling of test specimen . 3
7.2 Pre-treatment of test specimen . 3
8 Test procedure . 3
8.1 Weighing of aliquot . 3
8.1.1 Determination of weighing amount needed . 3
8.1.2 General weighing procedure . 3
15
8.2 Natural N abundance analysis . 4
8.2.1 Instrumentation . 4
8.2.2 General analytical procedure . 4
9 Precision .
...