ISO 9658:2024 PDF

Overview - What ISO 9658:2024 covers

ISO 9658:2024 specifies a flame atomic absorption spectrometric (FAAS) method for determining acid‑soluble and/or total aluminium in non‑alloyed steel. The procedure applies to aluminium contents from 0.005 % to 0.20 % (mass fraction). The standard describes sample preparation, required reagents and apparatus, instrument performance criteria, calibration and calculation of results, and reporting requirements.

Keywords: ISO 9658:2024, aluminium determination, steel analysis, flame atomic absorption spectrometry, FAAS, acid‑soluble aluminium.

Key technical topics and requirements

• Analytical principle: Dissolve test portion in a hydrochloric–nitric acid mixture; fuse any acid‑insoluble residue with an orthoboric acid/potassium carbonate mixture; nebulize the final solution into a dinitrogen monoxide–acetylene flame and measure atomic absorption at 309.3 nm (aluminium hollow‑cathode lamp).
• Scope and range: Applicable to non‑alloyed steel with aluminium between 0.005 % and 0.20 % mass fraction.
• Reagents and standards: Includes preparation of aluminium standard solutions (e.g., 2.0 g/L, 0.20 g/L, 0.020 g/L) and specific acid mixtures; use reagents of analytical grade and water conforming to ISO 3696.
• Apparatus & performance:
  • FAAS with Al hollow‑cathode lamp (or equivalent source).
  • Flame gases: dinitrogen monoxide and acetylene; strict purity to avoid Al contamination.
  • Instrument performance criteria: limit of detection