ISO 11626:2024 PDF

Natural gas — Determination of sulfur compounds — Determination of hydrogen sulfide content by UV absorption method

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Title (English):

ISO 11626:2024

Natural gas — Determination of sulfur compounds — Determination of hydrogen sulfide content by UV absorption method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: February 29, 2024
Edition:: ISO IS 11626 edition 1 version 1
ICS:: 75.060

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Description (English):

This document describes the test method for the determination of hydrogen sulfide content in natural gas by ultraviolet (UV) absorption method. This document applies to the determination of hydrogen sulfide content in natural gas, in the range from 1 mg/m3 to 50 mg/m3.

Technical details

Technical committee: ISO/TC 193/SC 1 - Analysis of natural gas
SKU: ISO 11626:2024

Abstract

Overview

ISO 11626:2024 specifies a standardized laboratory and online test method for the determination of hydrogen sulfide (H2S) in natural gas using a ultraviolet (UV) absorption technique. The method applies to H2S concentrations in natural gas in the range 1 mg/m3 to 50 mg/m3 and defines instrument requirements, sampling, calibration, analysis and quality assurance procedures to produce traceable, comparable results.

Key Topics

Principle: Quantification is based on UV absorption and Lambert–Beer’s law. Results are calculated proportionally to a calibration gas using C = Cref × (A / Aref), where A is sample absorbance.
Instrument components:
- Sample processing system to remove water, liquids and particulates and stabilize pressure/temperature.
- Optical analysis system (UV source, fibre-optic delivery, flow cell, spectrometer/diode array).
- Data processing and recording system for acquisition and reporting.
Calibration & reference gases:
- Use certified H2S calibration gas mixtures (gravimetric/dynamic) with certificates per ISO 6141 and related ISO methods.
- Single-point and multi-point calibration procedures are described. Convert fractions to mass concentration per ISO 14912 when needed.
Reagents & materials:
- Zero gas (methane or nitrogen, ≥ 999 mmol/mol main component).
- Alkali H2S absorption solution for scrubbing when required.
Sampling requirements:
- Probe location per ISO 10715.
- All wetted materials must be inert to sulfur compounds.
- Online sampling: continuous flow, transit to analyzer

Related standards

Standards mentioned in the description

Overview

Key Topics

Principle: Quantification is based on UV absorption and Lambert–Beer’s law. Results are calculated proportionally to a calibration gas using C = Cref × (A / Aref), where A is sample absorbance.
Instrument components:
- Sample processing system to remove water, liquids and particulates and stabilize pressure/temperature.
- Optical analysis system (UV source, fibre-optic delivery, flow cell, spectrometer/diode array).
- Data processing and recording system for acquisition and reporting.
Calibration & reference gases:
- Use certified H2S calibration gas mixtures (gravimetric/dynamic) with certificates per ISO 6141 and related ISO methods.
- Single-point and multi-point calibration procedures are described. Convert fractions to mass concentration per ISO 14912 when needed.
Reagents & materials:
- Zero gas (methane or nitrogen, ≥ 999 mmol/mol main component).
- Alkali H2S absorption solution for scrubbing when required.
Sampling requirements:
- Probe location per ISO 10715.
- All wetted materials must be inert to sulfur compounds.
- Online sampling: continuous flow, transit to analyzer

ISO 11626:2024 PDF

Technical details

Abstract

Overview

Key Topics

Related standards

Abstract

Overview

Key Topics

Related standards

Gas analysis - Contents of certificates for calibration gas mixtures - Amendment 1: Cross reference list to I…

Gas analysis - Conversion of gas mixture composition data (ISO 14912:2025)

Natural gas. Sampling guidelines