ISO 20921:2019 PDF
Textiles — Determination of stable nitrogen isotope ratio in cotton fibres
Textiles — Determination of stable nitrogen isotope ratio in cotton fibres
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 10
- Дата публикации:
- 31 января 2019 г.
- Издание:
- ISO IS 20921 edition 1 version 1
- ICS:
- 59.060.10
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.
Abstract
Overview
ISO 20921:2019 - Textiles - Determination of stable nitrogen isotope ratio in cotton fibres specifies a laboratory method to measure the stable nitrogen isotope composition (natural N abundance, expressed as δ15N) in cotton fibres and raw cotton. The standard describes the principle, sampling and pre-treatment, analytical instrumentation (EA‑IRMS), weighing conventions and reporting needed to produce accurate and reproducible δ15N results for cotton used in textile production.
Keywords: ISO 20921:2019, nitrogen isotope ratio, cotton fibres, δ15N, EA‑IRMS, stable nitrogen isotope, cotton authenticity, organic cotton verification.
Key topics and requirements
- Scope: Applies to cotton textiles and raw cotton taken from fields; intended for forensic and traceability uses.
- Principle: Uses isotope‑ratio mass spectrometry (IRMS) linked to an elemental analyser (continuous‑flow EA‑IRMS) to quantify the 15N/14N ratio and calculate δ15N against atmospheric N2 reference.
- Sampling & pre‑treatment: Samples are washed (distilled water immersion), oven‑dried (≈80 °C, 24 h), chopped and ground to
Технические детали
- Технический комитет
- ISO/TC 38 - Textiles
- SKU
- ISO 20921:2019
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