ISO 4940:2025 PDF

Steel and cast iron — Determination of nickel content — Flame atomic absorption spectrometric method

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Title (English):

ISO 4940:2025

Steel and cast iron — Determination of nickel content — Flame atomic absorption spectrometric method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 13
Publication date:: July 25, 2025
Edition:: ISO IS 4940 edition 2 version 1
ICS:: 77.080.01

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Description (English):

This document specifies a flame atomic absorption spectrometric method (FAAS) for the determination of nickel content in steel and cast iron. The method is applicable to nickel contents in the range of 0,002 % (mass fraction) to 0,5 % (mass fraction).

Technical details

Technical committee: ISO/TC 17/SC 1 - Methods of determination of chemical composition
SKU: ISO 4940:2025

Abstract

Overview

ISO 4940:2025 specifies a flame atomic absorption spectrometric (FAAS) method for the determination of nickel content in steel and cast iron. The method covers nickel mass fractions from 0.002% to 0.5% and defines sample preparation, reagents, instrument performance criteria, calibration and reporting requirements. This second edition updates references, adds guidance on solution preparation and a bibliography, and replaces ISO 4940:1985.

Key Topics and Requirements

Principle: Dissolve the test portion in appropriate acids, evaporate to fuming with perchloric acid, nebulize the final test solution into an air/acetylene flame, and measure atomic absorption of nickel at 232.0 nm or 352.5 nm (use 232.0 nm when sensitivity at 352.5 nm is insufficient).
Scope: Applicable to nickel contents of 0.002% to 0.5% (mass fraction).
Reagents and standards: Prescribes preparation of acid mixtures, a 1 g/L and 0.04 g/L nickel standard, and an iron base solution (40 g/L) to match matrix effects.
Sample size: Test portion typically about 1.0 g; perform parallel blank tests using pure iron.
Instrument performance criteria:
- Limit of detection for nickel in a similar matrix: **

Related standards

Mentioned in the description and other ISO standards

Overview

Key Topics and Requirements

Principle: Dissolve the test portion in appropriate acids, evaporate to fuming with perchloric acid, nebulize the final test solution into an air/acetylene flame, and measure atomic absorption of nickel at 232.0 nm or 352.5 nm (use 232.0 nm when sensitivity at 352.5 nm is insufficient).
Scope: Applicable to nickel contents of 0.002% to 0.5% (mass fraction).
Reagents and standards: Prescribes preparation of acid mixtures, a 1 g/L and 0.04 g/L nickel standard, and an iron base solution (40 g/L) to match matrix effects.
Sample size: Test portion typically about 1.0 g; perform parallel blank tests using pure iron.
Instrument performance criteria:
- Limit of detection for nickel in a similar matrix: **

ISO 4940:2025 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Related standards

Abstract

Overview

Key Topics and Requirements

Related standards

Steel and cast iron — Determination of nickel content — Flame atomic absorption spectrometric method

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