ISO 10101-3:2022 PDF

Natural gas — Determination of water by the Karl Fischer method — Part 3: Coulometric procedure

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Title (English):

ISO 10101-3:2022

Natural gas — Determination of water by the Karl Fischer method — Part 3: Coulometric procedure

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 9
Publication date:: August 31, 2022
Edition:: ISO IS 10101 edition 2 version 1
ICS:: 75.060

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Description (English):

This document specifies a coulometric procedure for the determination of water content by the Karl Fischer method. The method is applicable to natural gas and other gases which do not react with Karl Fischer (KF) reagents. It applies to water concentrations between 5 mg/m3 and 5 000 mg/m3. Volumes are expressed at temperature of 273,15 K (0 °C) and a pressure of 101,325 kPa (1 atm).

Technical details

Technical committee: ISO/TC 193/SC 1 - Analysis of natural gas
SKU: ISO 10101-3:2022

Abstract

Overview

ISO 10101-3:2022 - Natural gas - Determination of water by the Karl Fischer method - Part 3: Coulometric procedure specifies a coulometric Karl Fischer (KF) titration technique for measuring water content in natural gas and other gases that do not react with KF reagents. The standard covers measurements over the range 5 mg/m3 to 5 000 mg/m3, with volumes expressed at 273.15 K (0 °C) and 101.325 kPa (1 atm). It defines the coulometric principle, apparatus, reagents, sampling, test procedure, blank correction and result expression including measurement uncertainty.

Key topics and technical requirements

Method principle: Coulometric KF titration - iodine generated electrochemically; charge passed is proportional to water mass via Faraday’s law.
Applicable range: 5 mg/m3 to 5 000 mg/m3 (water in gas).
Reagents: Coulometric-specific reagents; for diaphragm cells use separate anolyte and catholyte. Recommended reference solution examples given (e.g., 10 mg/g ±1 % or alternatives 5.0 mg/l ±4 % / 10.0 mg/l ±4 %).
Cell designs: Cells with diaphragm (anode/cathode compartments) and without diaphragm - advantages and trade-offs are discussed.
Apparatus: Titration cell, gas inlet with 3‑way valve, drying tube, platinum electrodes, stirrer; wet-test gas meter or equivalent (accuracy ±1 %) to measure volume.
Operational parameters: Typical gas flowrate guidance 30–40 L/h (optimum depends on equipment geometry). Equilibration and drift checks required before measurement.
Blank correction: Required for low water concentrations (

Related standards

Other ISO standards

Overview

Key topics and technical requirements

Method principle: Coulometric KF titration - iodine generated electrochemically; charge passed is proportional to water mass via Faraday’s law.
Applicable range: 5 mg/m3 to 5 000 mg/m3 (water in gas).
Reagents: Coulometric-specific reagents; for diaphragm cells use separate anolyte and catholyte. Recommended reference solution examples given (e.g., 10 mg/g ±1 % or alternatives 5.0 mg/l ±4 % / 10.0 mg/l ±4 %).
Cell designs: Cells with diaphragm (anode/cathode compartments) and without diaphragm - advantages and trade-offs are discussed.
Apparatus: Titration cell, gas inlet with 3‑way valve, drying tube, platinum electrodes, stirrer; wet-test gas meter or equivalent (accuracy ±1 %) to measure volume.
Operational parameters: Typical gas flowrate guidance 30–40 L/h (optimum depends on equipment geometry). Equilibration and drift checks required before measurement.
Blank correction: Required for low water concentrations (

ISO 10101-3:2022 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

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