Overview
ISO 2613-2:2023 specifies a method for determining the siloxane content in biomethane using gas chromatography with ion mobility spectrometry (GC-IMS). This standard addresses the critical need for accurate quantification of silicon-containing siloxanes-such as L2, L3, L4, L5, D3, D4, D5, and D6-in biomethane. Siloxanes, originating from products like cosmetics and detergents, are common biomethane contaminants and can cause operational challenges by creating silica deposits in gas handling and combustion equipment. The method outlined is suitable for use both in laboratory and field environments and supports compliance with regulations governing the quality of biomethane for grid injection and transport applications.
Key Topics
- Siloxane Detection: The document covers measurement of eight siloxanes (L2, L3, L4, L5, D3, D4, D5, D6) prevalent in biomethane.
- Analytical Technique: Utilizes GC-IMS, enabling sensitive and selective analysis of low-concentration siloxanes.
- Calibration & Traceability: Details the use of traceable calibration gases prepared following ISO gas analysis standards, ensuring the reliability of results.
- Sampling Strategies: Stresses the importance of representative sampling, material selection (to prevent siloxane adsorption), and rigorous cleaning procedures for all wetted parts.
- Measurement Conditions: Method applicable to biomethane at 1-2 bar absolute pressure, 0–40°C, and relative humidity under 90%.
- Result Expression: Specifies results in both mass concentration (mg/m³) and amount fraction (μmol/mol), with required uncertainty evaluation and comprehensive reporting.
Applications
The practical applications of ISO 2613-2:2023 span across:
- Biomethane Quality Assurance: Ensuring produced biomethane meets the stringent specifications for siloxane content, mitigating the risk of silica deposition and protecting downstream equipment.
- Compliance and Reporting: Supporting producers and distributors in demonstrating compliance with national and international biomethane quality standards, including those for gas grid injection and transport fuels.
- Process Optimization: Providing data for operators to monitor siloxane levels and adjust treatment processes, optimizing efficiency, and reducing maintenance costs.
- Safety and Reliability: Minimizing risks to personnel and infrastructure associated with siloxane contamination through reliable testing and validation procedures.
Related Standards
Professionals applying ISO 2613-2:2023 may also reference:
- ISO 6142-1: Gas analysis - Preparation of calibration gas mixtures - Gravimetric method for Class I mixtures
- ISO 6143, ISO 6144, ISO 6145-1: Related to preparation and validation of calibration gases
- ISO 10715: Natural gas - Gas sampling
- ISO 10723: Natural gas - Performance evaluation for analytical systems
- ISO 14912: Gas analysis - Conversion of gas mixture composition data
- EN 16723-1 and EN 16723-2: Specifications for biomethane for grid injection and automotive fuel use
- ISO/IEC Guide 98-3: Uncertainty of measurement
By adhering to ISO 2613-2:2023 and these related standards, organizations can ensure accuracy, repeatability, and international recognition of their biomethane analysis results, thereby supporting the integrity and expansion of renewable gas solutions.
Keywords: ISO 2613-2:2023, siloxane content, biomethane analysis, gas chromatography, ion mobility spectrometry, GC-IMS, natural gas quality, calibration, gas sampling, renewable gas standards, biomethane compliance.