ISO 622:2025

Name: ISO 622:2025 — Coal and coke — Determination of phosphorus — Reduced molybdophosphate photometric method
SKU: ISO 622:2025
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Coal and coke — Determination of phosphorus — Reduced molybdophosphate photometric method

Название (английский):

ISO 622:2025

Coal and coke — Determination of phosphorus — Reduced molybdophosphate photometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 25 июня 2025 г.
Издание:: ISO IS 622 edition 3 version 1
ICS:: 73.040

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Описание (английский):

This document specifies a reduced molybdophosphate photometric method for the determination of the total phosphorus mass fraction of hard coal, lignites and coke. Two methods for taking the phosphorus into solution are specified, namely extraction from the coal or coke ash with acid or by repeated oxidation of the coal or coke, by acid, to remove carbonaceous matter.

Abstract

Overview

Key topics and requirements

Scope and samples: Analysis sample prepared and ground to pass a 212 µm sieve, taken and prepared per ISO sampling standards. Ash is prepared per ISO 1171 when using the dry-ash extraction route.
Two extraction methods:
- Dry oxidation (ash extraction): ash the sample, grind to pass 63 µm, extract with hydrofluoric acid (HF) and sulfuric acid (H2SO4).
- Wet oxidation: repeated oxidation of the coal/coke with nitric acid (HNO3) in the presence of sulfuric acid to remove carbonaceous matter.
Photometric determination: add ammonium molybdate and ascorbic acid (with antimony potassium tartrate as accelerator) to produce the reduced molybdophosphate blue; measure absorbance with a spectrophotometer or photoelectric absorptiometer.
Reagents and apparatus: lists analytical-grade reagents (HF, H2SO4, HNO3, molybdate, ascorbic acid, standards) and apparatus (muffle furnace, platinum crucible, Kjeldahl flask assembly for wet digestion, spectrophotometer).
Safety notes: strong warnings for handling hydrofluoric acid (highly corrosive and toxic) and heat generation when preparing sulfuric acid dilutions.
Quality and performance: clauses on precision (repeatability and reproducibility) and requirements for reagent blanks, calibration (standard phosphorus solutions) and expression of results.
Reporting: updated Clause 11 specifies required information in the test report.

Applications and users

ISO 622:2025 is used for:

Quality control in coal and coke production and trading
Laboratory analysis in power generation, metallurgical coke plants, and coal research
Environmental monitoring and regulatory compliance where phosphorus content affects ash behavior, slagging or emissions
Instrument and reagent suppliers for method validation and product guidance

Typical users: analytical chemists, coal testing laboratories, QA/QC managers, plant technical teams, environmental laboratories and standards bodies.

Related standards

Normative references include ISO 1171 (ash), ISO 565 (sieves), ISO 18283 and ISO 13909 series (sampling and sample preparation), and ISO 383 (lab glassware). Reference ISO 622:2016 for prior edition comparisons.

Технические детали

Технический комитет: ISO/TC 27/SC 5 - Methods of analysis
SKU: ISO 622:2025

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