ISO 29541:2025 PDF

Name: ISO 29541:2025 — Coal and coke — Determination of total carbon, hydrogen and nitrogen — Instrumental method
SKU: ISO 29541:2025
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Coal and coke — Determination of total carbon, hydrogen and nitrogen — Instrumental method

Название (английский):

ISO 29541:2025

Coal and coke — Determination of total carbon, hydrogen and nitrogen — Instrumental method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 4 февраля 2025 г.
Издание:: ISO IS 29541 edition 2 version 1
ICS:: 73.040

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Описание (английский):

This document specifies a method for the determination of total carbon, hydrogen and nitrogen in coal and coke by instrumental methods. NOTE This document has been validated for coal only, in accordance with the principles of ISO 5725-1. The suite of samples used in the interlaboratory study (ILS) to determine the precision data did not include coke and therefore there is insufficient data to state precision limits for coke.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 29541:2025 - "Coal and coke - Determination of total carbon, hydrogen and nitrogen - Instrumental method" specifies an instrumental combustion procedure for the concurrent determination of total carbon (C), hydrogen (H) and nitrogen (N) in coal and coke. The method converts sample C, H and N to gaseous products (CO2, H2O, N/NOx) by combustion in oxygen, removes interfering species, reduces NOx to N2 and quantifies the gases by instrumental gas analysis. Note: the method and its precision data were validated for coal only; precision limits for coke are not established due to insufficient interlaboratory data.

Key topics and requirements

Principle: Single-run combustion with gas analysis for CO2, H2O and N (after NOx reduction).

Instrument and sample: Analytical instrument with furnace, gas-handling and detectors capable of analysing test portions of 6 mg or greater; balance resolution appropriate to test mass.

Sample preparation: General analysis test sample ground to a nominal top size of 212 µm, moisture equilibrated with laboratory atmosphere and thoroughly mixed.

Reagents and calibration materials: Carrier gas (e.g., helium), oxygen and certified calibration materials (examples include EDTA, phenylalanine, acetanilide, BBOT). Coal must not be used for calibration because composition can change with storage.

Procedure essentials:

Instrument set-up and leak checks
Daily blank analyses to monitor background C/H/N
Conditioning and stability checks (discarding initial runs)
Calibration and verification using independent calibration material
Regular verification during batches (preferably every ten samples); samples analysed in duplicate

Acceptance limits for calibration verification:

Carbon: ±0.2% (relative)
Hydrogen: ±0.5% (relative)
Nitrogen: ±1% (relative)

Quality/precision: Repeatability and reproducibility limits are provided in Clause 10 (updated in this edition); the validation follows ISO 5725-1 principles.

Safety: Method involves hazardous operations and materials - users must follow appropriate safety practices.

Applications and users

ISO 29541:2025 is used where reliable total C, H and N measurements are required:

Coal and coke quality control laboratories

Power generation and utilities (combustion calculations, fuel characterization)

Mining companies and coke producers (product specification)

Environmental and emissions modelling (fuel carbon accounting)

Research institutions and instrument manufacturers (method development, calibration) The standard supports accurate carbon accounting, combustion performance assessment and compliance with fuel specification requirements.

Related standards

ISO 5725-1 (method validation/precision principles)

ISO 13909-4, ISO 18283 (sample preparation and sampling)

ISO 11722, ISO 687, ISO 5068-2 (moisture determination methods)

Keywords: ISO 29541:2025, coal and coke analysis, total carbon hydrogen nitrogen, instrumental combustion method, calibration, sample preparation, coal analysis, coke analysis, precision limits.

ISO 29541:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

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