ISO 11723:2025 PDF

Name: ISO 11723:2025 — Coal and coke — Determination of arsenic and selenium — Eschka's mixture and hydride generation method
SKU: ISO 11723:2025
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Coal and coke — Determination of arsenic and selenium — Eschka's mixture and hydride generation method

Название (английский):

ISO 11723:2025

Coal and coke — Determination of arsenic and selenium — Eschka's mixture and hydride generation method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 25 июня 2025 г.
Издание:: ISO IS 11723 edition 3 version 1
ICS:: 73.040

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Описание (английский):

This document specifies a method using Eschka's mixture during ashing, extraction of the ash residue with acid, and hydride generation atomic absorption spectrometry or hydride generation atomic fluorescence spectrometry, for the determination of arsenic and selenium in solid mineral fuels. The method is also applicable for the determination of the analytes by hydride generation inductively coupled plasma atomic emission spectrometry.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO 11723:2025 defines a standardized laboratory method for the determination of arsenic and selenium in solid mineral fuels (coal and coke). The method combines ashing with Eschka's mixture, acid extraction of the ash residue, and hydride generation coupled to atomic spectrometric detection: hydride generation atomic absorption spectrometry (HG-AAS), hydride generation atomic fluorescence spectrometry (HG-AFS), or hydride generation inductively coupled plasma atomic emission spectrometry (HG‑ICP‑AES).

This procedure is intended for reliable trace-level analysis of these toxic elements in quality control, environmental monitoring and regulatory compliance for the coal and coke sectors.

Key Topics

Principle: Sample is ignited with Eschka's mixture in an oxidizing atmosphere to remove organics, the residue is dissolved in hydrochloric acid, and arsenic/selenium are determined using hydride generation and atomic spectrometry.

Sample preparation: Typical test portion ~0.5 g mixed with specified masses of Eschka's mixture; controlled muffle furnace ashing at 800 °C; extraction with HCl and gravimetric dilution to a defined mass or volume.

Reagents and standards: Use of analytical-grade reagents, defined stock and working standards for arsenic and selenium, freshly prepared sodium borohydride reducing solution and potassium iodide for arsenic measurements.

Measurement: Instrument optimization is performed per manufacturer guidance. Reported analytical wavelengths in the standard: As at 193.7 nm and Se at 196.0 nm. Hydride generation improves sensitivity and reduces matrix effects for volatile hydride-forming elements.

Quality controls: Blank determinations are performed concurrently. Calibration standards are prepared in a matrix-matched Eschka blank. Duplicate test portions and method blanks support traceability.

Applications

Routine laboratory determination of arsenic and selenium in coal and coke for:

Environmental monitoring and emissions control
Product quality and safety assessment
Compliance with regulatory limits and reporting

Beneficial where low detection limits and reduced spectral interferences are required; hydride generation is particularly effective for volatile species and trace analysis.

Related Standards

ISO 687 - Moisture determination for coke analysis sample

ISO 1170, ISO 3696 - Calculation and laboratory water quality requirements

ISO 13909 series and ISO 18283 - Sampling and preparation of test samples for coal and coke

Practical value: Implementing ISO 11723:2025 ensures a harmonized, reproducible approach to trace arsenic and selenium analysis in solid mineral fuels, facilitating consistent results across laboratories and supporting regulatory and commercial decision-making.

ISO 11723:2025 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

SIST EN ISO 6876:2026

Dentistry - Endodontic sealing material (ISO 6876:2025)

SIST EN ISO 11704:2019

Water quality - Gross alpha and gross beta activity - Test method using liquid scintillation counting (ISO 11…

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

BS ISO 13909-2:2025

Coal and coke. Mechanical sampling. Sampling of coal from moving streams.

BS ISO 18283:2022-TC

Tracked Changes. Coal and coke. Manual sampling.