Overview
EN ISO 2611-1:2024 - Analysis of natural gas - Halogen content of biomethane - Part 1: HCl and HF content by ion chromatography (ISO 2611-1:2024) specifies a laboratory method to determine hydrochloric acid (HCl) and hydrofluoric acid (HF) in biomethane (and biogas) after collection on an alkali‑impregnated quartz fibre filter or a sorbent trap, using ion chromatography (IC) with conductimetric detection. The method covers HCl concentrations from 0.07 mg/m3 to 35 mg/m3 and HF from 0.07 mg/m3 to 20 mg/m3, with results expressed under standard reference conditions (see ISO 13443).
Key topics and technical requirements
- Sampling media: alkali‑impregnated quartz fibre filters or sorbent cartridges/traps for on‑line collection.
- Analytical technique: ion chromatography (IC) with conductimetric detection for chloride and fluoride quantification.
- Measurement range: HCl 0.07–35 mg/m3; HF 0.07–20 mg/m3 (under standard reference conditions).
- Reagents & consumables: water, eluents, calibration standards (chloride/fluoride stock and working solutions), syringe and quartz filters, sorbent tubes.
- Apparatus: validated IC system, separator column meeting quality requirements, gas sampling pump and volume measurement devices.
- Procedure elements: sampling protocols (filter‑based and cartridge‑based), sample pre‑treatment, calibration, measurement, calculation and expression of results.
- Quality control: calibration checks, performance data and method characteristics (precision, detection limits) as described in the standard.
- Scope and conformity: applicable to biomethane and biogas; intended to support conformity assessment against specifications such as the EN 16723 series.
Applications and who uses this standard
- Biomethane and biogas producers for quality control before grid injection or vehicle fuel use.
- Gas analysis laboratories performing compliance testing and routine monitoring of halogen acids.
- Gas grid operators and regulators assessing conformity of injected biomethane to specification limits.
- Equipment manufacturers and maintenance teams concerned with corrosive contaminants (HCl/HF) that can damage compressors, pipelines and catalysts.
- Certification bodies verifying compliance with specifications like EN 16723 for grid injection or transport fuel.
Related standards
- EN 16723 series - biomethane quality and specifications (conformity context).
- ISO 13443 - standard reference conditions for gas concentrations.
- ISO 2611 series - other parts related to halogen analysis (refer to ISO documentation for full series).
EN ISO 2611-1:2024 provides a standardized, validated IC-based procedure to reliably quantify halogen acids in biomethane/biogas - essential for compliance, equipment protection and safe grid/transport use.
