ISO 4943:2022

Overview

ISO 4943:2022 - Steel and cast iron: Determination of copper content by flame atomic absorption spectrometric method specifies a validated laboratory procedure for measuring copper in steel and cast iron. The standard covers sample dissolution, calibration, instrument performance checks and result reporting for copper contents from 0.003 % to 3.0 % (mass fraction) using flame atomic absorption spectrometry (FAAS).

Key topics and requirements

• Analytical principle: Dissolution of a test portion in a hydrochloric/nitric/perchloric acid mixture followed by nebulization into an air/acetylene flame and measurement of copper atomic absorption (324.7 nm or 327.4 nm spectral lines; copper hollow‑cathode lamp recommended).
• Scope and range: Applicable to copper levels between 0.003 % and 3.0 %.
• Reagents and preparations: Use analytical‑grade reagents and ISO 3696 grade 2 water; preparation of copper standard solutions (1.0 g/L and 20 mg/L) and specific acid mixtures are defined.
• Sample size and dissolution: Typical test portion ~0.50 g; dissolution procedure includes evaporation to perchloric fumes and transfer to volumetric flasks; filtration to remove insoluble residues.
• Instrument performance criteria (Annex A procedures referenced):
  • Limit of detection for copper in a comparable matrix better than 0.05 µg/mL.
  • Characteristic concentration for copper (324.7 nm) better than 0.08 µg/mL.
  • Precision and linearity checks: limits on absorbance repeatability and slope linearity across calibration range.
• Quality checks: Blank determination, calibration curve plotting, scale expansion guidance and instrument optimization.
• Safety note: Special precautions for perchloric acid fuming and exhaust systems.

Applications and users

ISO 4943:2022 is intended for:

• Metallurgical and chemical laboratories performing quality control and chemical composition analysis of steel and cast iron.
• Producers of ferrous alloys, inspection bodies and research labs needing accurate copper quantification for material specification, failure analysis, recycling control and process monitoring.
• Laboratories implementing accredited testing systems (e.g., ISO/IEC 17025) that require standardized, traceable FAAS methods.

Practical benefits include reproducible copper assays across laboratories, clear instrument acceptance criteria, and step‑by‑step sample preparation suitable for routine testing.

Related standards

• ISO 14284 - Sampling and preparation of samples for chemical composition determination (steel & iron)
• ISO 3696 - Water for analytical laboratory use
• ISO 648 / ISO 1042 - Volumetric glassware specifications

Keywords: ISO 4943:2022, copper determination, flame atomic absorption spectrometry, FAAS, steel testing, cast iron analysis, metallurgical laboratory, analytical method.