Overview
ISO 759:1981 sets out a general method for the determination of dry residue after evaporation on a water bath in volatile organic liquids used for industrial applications. This international standard is essential for chemical analysis, quality control, and regulatory compliance in industries handling organic liquids. The procedure involves evaporating a test sample, drying the residue at 110°C, and measuring the remaining mass. The method applies to products with dry residues of 10 mg/kg or greater, ensuring reliable quantification of impurities or non-volatile content.
Key Topics
- Scope: Focuses on volatile organic liquids for industrial use, applicable when dry residue after evaporation is ≥10 mg/kg (0.001% by mass).
- Test Principle:
- Evaporate a measured portion of the sample on a water bath.
- Further dry the residue in an oven at 110°C until constant mass is achieved.
- Express the results in mg/L, mg/kg, mg/100ml, or % by mass according to system requirements.
- Apparatus:
- Laboratory glassware (platinum, silica, or borosilicate dishes)
- Water bath suitable for the product boiling point
- Electric oven (capable of maintaining 110°C ±2 K)
- Well-ventilated fume cupboard for safety
- Safety Considerations:
- Handle volatile, flammable, or toxic liquids with caution.
- Always operate in a fume cupboard and assess safety risks before testing.
- Reporting Requirements: The standard emphasizes thorough reporting, including sample identification, test details, observed anomalies, and any deviations from standard procedure.
Applications
Implementing ISO 759:1981 has practical value in multiple sectors, including:
- Industrial Quality Control: Ensures solvents, chemicals, and process liquids meet residue specifications for performance and safety.
- Regulatory Compliance: Aligns with environmental and safety standards requiring quantification of non-volatile content in industrial chemicals.
- Purchase Specifications: Supports manufacturers and customers in verifying product purity and suitability for downstream processes.
- Research & Development: Useful in laboratory settings for analyzing new organic formulations or identifying sources of contamination.
- Environmental and Health Safety: By identifying and quantifying residues, the method helps reduce exposure to harmful contaminants.
This ISO standard provides a robust, repeatable method suitable for laboratories, chemical manufacturers, industrial plants, and any setting where volatile organic liquids require examination for non-volatile impurities.
Related Standards
For comprehensive analytical coverage and sector-specific requirements, the following related ISO standards are relevant:
- ISO 758 - Liquid chemical products for industrial use - Determination of density at 20°C: Essential for result calculation by mass.
- ISO 5277 - Aromatic hydrocarbons - Determination of residue on evaporation: Specific to aromatic hydrocarbons and similar volatile materials.
- ISO 5789 - Fluorinated hydrocarbons for industrial use - Determination of non-volatile residue: For products with unique analytical needs due to fluorination.
By referencing or integrating these standards, organizations can develop tailored protocols that enhance accuracy, safety, and compliance within chemical analysis programs.
Keywords: ISO 759:1981, volatile organic liquids, dry residue determination, industrial chemicals, evaporation analysis, gravimetric method, quality control, non-volatile content, international standard, chemical analysis, laboratory test methods.