ISO 9647:2020 PDF

Overview

ISO 9647:2020 defines a standardized laboratory procedure for the determination of vanadium in steel using flame atomic absorption spectrometry (FAAS). The method covers vanadium mass fractions from 0.01 % to 0.80 %, and specifies sample preparation, reagents, instrumentation and performance checks required to produce reliable, comparable results in metallurgical and analytical laboratories.

Key topics and technical requirements

• Analytical technique: Flame atomic absorption spectrometric method (FAAS) with nebulisation into an acetylene/nitrous oxide flame and measurement of the 318.4 nm vanadium spectral line (vanadium hollow‑cathode lamp).
• Scope limits: Applicable for vanadium content 0.01–0.80 % (mass fraction). Applicability is conditional on tungsten ≤ 1.0 % and/or titanium ≤ 0.5 % in a 1.0 g test portion.
• Sample preparation: Complete dissolution using hydrochloric, nitric and perchloric acids, addition of an aluminium chloride buffer, filtration and volumetric dilution to prepare the final test solution.
• Calibration and standards: Preparation of matrix-matched calibration solutions from certified vanadium standard solutions; recommended calibration ranges and test portion masses (e.g., ~1.00 g for low vanadium, ~0.20 g for higher contents).
• Instrument performance criteria:
  • Limit of detection for vanadium in a matrix similar to the test solution: **