Overview
ISO 22863-10:2021 - Fireworks - Test methods for determination of specific chemical substances - Part 10 specifies a standardized analytical method to determine the nitrogen content in nitrocellulose contained in pyrotechnic compositions (fireworks). The method isolates nitrocellulose from other nitrogen-containing ingredients, converts the cellulose nitrate to nitric acid using concentrated sulphuric acid, and quantifies nitrogen by iron(II) sulfate titration with potentiometric end‑point detection.
Key topics and technical requirements
- Scope and principle: Measurement of nitrogen in nitrocellulose within fireworks formulations by titration after chemical release of nitric acid and potentiometric monitoring.
- Sample preparation:
- Drying, grinding and splitting the sample; typical starting mass examples provided (e.g., 10 g split into thirds, 3 g test portions).
- Removal of soluble nitrates and other nitrogenous interferences by hot water reflux (iterative if required) and verification by infrared spectrometry.
- Extraction of nitrocellulose using acetone (or a specified alternative solvent if acetone dissolves other ingredients), evaporation to obtain the last solid residue.
- Reagents and solutions:
- Use of analytical‑grade reagents (sulphuric acid, acetone, iron(II) sulfate heptahydrate, potassium nitrate for calibration).
- Preparation of stabilized iron(II) sulfate titrant in acidic medium and storage in opaque vessels.
- Apparatus:
- pH/voltage meter with precision better than 0.1, platinum and reference electrodes, magnetic stirrer, reflux apparatus, balance (0.0001 g accuracy), ovens, agate mortar, etc.
- Titration and calibration:
- Calibration of the Fe(II) solution using a potassium nitrate standard and potentiometric titration to find the inflexion volume.
- Potentiometric titration of the nitrocellulose digestion solution; calculation formulas provided to convert titrant volume to nitrogen percentage.
- Reporting: Required test-report items and calculations for reproducible results.
Applications and users
- Quality control and batch verification in fireworks and pyrotechnic manufacturing to ensure consistent performance and safety.
- Laboratories performing compliance testing, certification bodies, and regulatory testing agencies assessing chemical content in pyrotechnic compositions.
- R&D teams developing formulations who need accurate nitrocellulose nitrogen content for performance tuning and safety assessments.
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Related standards
- ISO 22863-1 - Fireworks - Test methods - Part 1: General (normative reference for the series).
- The full ISO 22863 series covers additional analytical methods and general procedures for fireworks testing and can be consulted for complementary test methods.
Open preview (PDF)Fireworks — Test methods for determination of specific chemical substances — Part 10: Nitrogen content in nitrocellulose by iron(II) sulfate titration
