Overview
ISO 9683-1:2006 specifies a BPHA spectrophotometric method for the determination of vanadium mass fraction in iron ores. The method covers natural iron ores, iron ore concentrates and agglomerates (including sinter), and is applicable to vanadium contents from 0.005 % to 0.5 % (mass fraction). The standard defines the analytical principle, required reagents and apparatus, sampling and sample preparation, calibration, precision guidance and reporting requirements.
Key topics and technical requirements
- Analytical principle: Fusion with sodium peroxide, acid leach, oxidation to pentavalent vanadium, complexation with N‑benzoyl‑phenylhydroxylamine (BPHA), chloroform extraction and spectrophotometric measurement at approximately 535 nm.
- Applicable range: 0.005–0.5 % V in iron ores, concentrates and sinter products.
- Sample preparation: Laboratory sample particle size −100 µm (or −160 µm for ores with significant combined water/oxidizable compounds) following ISO 3082 and ISO 7764. Predried test samples at 105 °C ± 2 °C.
- Test portion & replication: Typical test portion ~0.5 g (weighed to 0.0002 g); analyses carried out at least in duplicate with independent repetitions and appropriate recalibration.
- Quality control: Each run requires a blank test and an analysis of a certified reference material of similar ore type. Calibration uses prepared vanadium standards and background solution.
- Reagents & apparatus: Requires BPHA reagent, potassium permanganate, sodium nitrite, urea, chloroform, sodium peroxide, orthophosphoric/sulfuric/hydrochloric acids; apparatus includes zirconium or vitreous carbon crucibles, muffle furnace (420 °C ± 10 °C) and a spectrophotometer.
- Safety: The method involves hazardous reagents and operations (e.g., chloroform, high‑temperature fusion); users must apply appropriate lab safety practices.
Applications and users
ISO 9683-1:2006 is designed for:
- Mining and mineral processing laboratories performing vanadium assays in iron ore feedstocks and concentrates.
- Quality assurance/quality control (QA/QC) teams monitoring ore composition for smelting, blending and trading.
- Analytical service laboratories providing certified results for commercial transactions, regulatory reporting and process control.
- Research groups studying vanadium distribution in ore deposits or metallurgical behavior.
Practical benefits include a standardized, validated spectrophotometric procedure suited to routine laboratory workflows, clear guidance on sampling/preparation and built‑in QC (blanks, CRMs, calibration and precision data).
Related standards
Keywords: ISO 9683-1:2006, vanadium determination, BPHA spectrophotometric method, vanadium in iron ore, spectrophotometry, iron ores QA/QC.
