Overview
ISO 4297:1978 - Manganese ores and concentrates - Methods of chemical analysis - General instructions provides foundational guidance for chemical testing of manganese ores and concentrates. It does not prescribe specific analytical methods but specifies the general requirements for reagents, apparatus, sample handling, calibration, quality checks, and test reporting to ensure reliable, repeatable results across laboratories.
Key topics and technical requirements
- Reagents and water quality
- Use chemically pure (purissimum) reagents where possible; pro analysi grade is acceptable if purissimum is unavailable.
- Use distilled or deionized water for reagent preparation; redistilled/deionized water required for trace-element determinations.
- Solution preparation
- Prepare and, if necessary, filter solutions freshly.
- Bring solutions to 20 °C before diluting to volume in volumetric flasks.
- Temperature terminology: hot > 60 °C; warm 40–60 °C.
- Apparatus and measurement
- Weighing on an analytical balance to 0.0002 g resolution.
- Verify and correct laboratory measuring equipment (pipettes, burettes, flasks, thermometers).
- Choose absorbance cells to keep measurements in the optimal absorbance range.
- Sampling and sample preparation
- Analyse air-dried samples or samples dried at 105–110 °C as specified.
- Hygroscopic moisture content must be determined in parallel following ISO 310; apply conversion factor to report dry-basis results.
- Procedure controls
- Perform duplicate (or as specified, triplicate) test portions; accept the arithmetic mean if the range falls within permissible tolerances.
- Conduct blank tests (two per run) and check tests using standard reference samples.
- Standardize volumetric solutions with at least three titrations.
- Calibration graphs
- Construct calibration graphs on rectangular coordinates (mass in mg vs measured response: absorbance, current, etc.).
- Base absorbance calibration on at least three standards and verify with one or two standard samples.
- Test report content
- Include sample identification, reference to the standard, analytical results, reference numbers, and any observed characteristics or non-standard operations that might affect results.
Applications and users
ISO 4297:1978 is intended for:
- Analytical and metallurgical laboratories performing chemical analysis of manganese ores and concentrates
- Mining companies and quality-control teams validating assay procedures
- Regulatory bodies and certification agencies ensuring consistent reporting and inter-laboratory comparability
- Laboratory managers implementing quality assurance and method-validation practices
Keywords: ISO 4297:1978, manganese ores, chemical analysis, reagents, calibration graphs, hygroscopic moisture, analytical balance, sample preparation, test report.
Related standards
- ISO 310 - Manganese ores - Determination of hygroscopic moisture content in analytical samples (referenced for moisture determination procedures).
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