Overview
ISO 25139:2011 specifies a standardized, manual method for determining methane concentrations in emissions from stationary sources using gas chromatography. Developed by the International Organization for Standardization (ISO), this document provides a validated procedure for mass concentrations of methane up to 1,500 mg/m³. The standard is designed as an independent reference method, supporting regulatory compliance, calibration, and quality assurance for emission monitoring systems.
Methane is a potent greenhouse gas, and stationary sources such as industrial plants, landfills, and waste treatment facilities are significant contributors to atmospheric methane levels. Accurate and consistent measurement of these emissions is critical for environmental monitoring and regulatory reporting.
Key Topics
- Manual Methane Measurement:
- Describes step-by-step procedures for gas sampling, handling, and laboratory analysis using gas chromatography with a flame ionization detector (FID).
- Sampling System Requirements:
- Outlines necessary components, including sampling probes, particle filters, sample gas coolers, pumps, and gas-sampling vessels or bags.
- Stresses materials compatibility, leak tightness, and preparation protocols to ensure sample integrity.
- Analytical Procedures:
- Provides guidance for injecting samples into the gas chromatograph, including sample loop and gas-tight syringe methods.
- Details baseline separation requirements to avoid interference from other hydrocarbons, especially ethane.
- Calculation and Corrections:
- Explains calculations for methane concentration at standard conditions, including corrections for water vapor and oxygen content.
- Quality Assurance & Control (QA/QC):
- Specifies minimum frequencies and procedures for calibration, detection limits, leak checks, and system performance verification.
- Emphasizes traceability and documentation for reliable reporting.
- Reporting Requirements:
- Lists essential items for comprehensive test reports, ensuring transparency and reproducibility.
Applications
ISO 25139:2011 is widely applicable in the following areas:
- Environmental Compliance:
- Used by regulatory agencies, laboratories, and industry to demonstrate compliance with environmental legislation and emission limits for stationary sources.
- Plant & Facility Monitoring:
- Enables operators of manufacturing plants, waste incinerators, biogas units, and other stationary emission sources to monitor and control methane output reliably.
- Calibration and Validation:
- Serves as a standard reference method for validating automated continuous emission monitoring systems (AMS), especially during system certification or periodic performance checks.
- Research and Development:
- Supports scientific studies on methane emissions from anthropogenic sources, including technology testing for emission mitigation and climate impact assessment.
Methane measurement using this manual method ensures high accuracy and traceability, making it valuable in situations where reliable reference data is required for environmental management and reporting.
Related Standards
For comprehensive emission monitoring and quality control, users of ISO 25139:2011 should also consider:
- ISO 9169
- Air quality - Definition and determination of performance characteristics of automatic measuring systems
- Provides key definitions and procedures for characterizing measurement performance.
- EN 15267-3
- Air quality - Certification of automated measuring systems - Part 3: Performance criteria and test procedures for emission monitoring from stationary sources
- Details certification and performance testing for automated systems.
- EN 14181
- Stationary source emissions - Quality assurance of automated measuring systems
- Outlines requirements for calibrating and validating automated measuring systems (AMS) using standard reference methods.
- ISO/IEC Guide 98-3
- Uncertainty of measurement
- Assists in evaluating and expressing uncertainty associated with emission measurements.
Using ISO 25139:2011 in conjunction with these related standards ensures robust, credible, and internationally recognized measurement of methane emissions from stationary sources, supporting both regulatory compliance and environmental protection objectives.
Open preview (PDF)Stationary source emissions — Manual method for the determination of the methane concentration using gas chromatography
