Overview
ISO 4687-1:1992 specifies the molybdenum blue spectrophotometric method for determining the phosphorus content in iron ores. This International Standard is applicable to a range of materials including natural iron ores, iron ore concentrates, and agglomerates such as sinter products. The specified method quantifies phosphorus contents between 0.003% (m/m) and 2% (m/m). Importantly, the presence of elements like arsenic, barium, or titanium does not interfere with the results, ensuring reliable chemical analysis across diverse iron ore matrices.
This standard is an essential reference for laboratories and organizations involved in iron ore quality control, ensuring consistent, accurate measurement of phosphorus to support processing, trade, and compliance.
Key Topics
- Scope of Application:
- Designed for natural iron ores, concentrates, and sinter products.
- Effective for phosphorus content from 0.003% to 2% (m/m).
- Analytical Principle:
- Utilizes the molybdenum blue spectrophotometric technique.
- Involves fusing a test portion, chemical treatment to form a blue complex, and absorbance measurement at around 820 nm.
- Interference Resilience:
- The methodology is unaffected by arsenic, barium, or titanium, ensuring robustness.
- Accuracy and Precision:
- Requires use of certified reference materials and includes repeatability and statistical acceptability criteria.
- Offers guidance on test sample preparation and rigorous calibration procedures.
- Sampling and Preparation:
- Samples must be prepared according to ISO 7764 and related sampling standards to ensure representativeness and accuracy.
Applications
- Iron Ore Quality Control:
- Widely used in mining laboratories and steel industry plants to certify phosphorus levels in iron ore shipments and batches.
- Material Certification:
- Essential for producers and exporters aiming to meet customer specifications and international trade requirements.
- Process Monitoring:
- Facilitates process control by tracking phosphorus during beneficiation and agglomeration processes such as sintering.
- Research and Development:
- Useful for laboratory research, product development, and comparative analysis of iron ore deposits.
- Environmental Compliance:
- Supports compliance with regulations concerning element concentrations in extracted and processed ores.
By standardizing testing procedures, ISO 4687-1:1992 ensures compatibility of results across laboratories and countries, aiding global iron ore trade and industrial collaboration.
Related Standards
- ISO 7764: Iron ores - Preparation of predried test samples for chemical analysis.
- ISO 3081: Iron ores - Increment sampling - Manual method.
- ISO 3082: Iron ores - Increment sampling and sample preparation - Mechanical method.
- ISO 3083: Iron ores - Preparation of samples - Manual method.
- ISO 648: Laboratory glassware - One-mark pipettes.
- ISO 1042: Laboratory glassware - One-mark volumetric flasks.
These related standards provide complementary guidance on iron ore sampling, sample preparation, and laboratory equipment, contributing to the overall reliability and reproducibility of phosphorus content determination in iron ores.
Keywords: ISO 4687-1:1992, iron ores, phosphorus determination, molybdenum blue spectrophotometric method, chemical analysis, iron ore concentrates, sinter products, sample preparation, certified reference materials, international standards.
Open preview (PDF)Iron ores — Determination of phosphorus content — Part 1: Molybdenum blue spectrophotometric method