ISO 10101-3-2022 PDF

Full title and description

Natural gas — Determination of water by the Karl Fischer method — Part 3: Coulometric procedure. This international standard specifies a coulometric Karl Fischer procedure for determining water content in natural gas and other gases that do not react with Karl Fischer reagents; it defines the measurement range, conditions, and basic procedural requirements for routine laboratory and field determinations.

Abstract

This document specifies a coulometric procedure for the determination of water content by the Karl Fischer method applicable to natural gas and other non‑reactive gases. The method covers water concentrations from about 5 mg/m3 up to 5 000 mg/m3 and expresses volumes at 273.15 K (0 °C) and 101.325 kPa (1 atm). The procedure describes how to pass a measured volume of gas through the titration cell where water is absorbed and determined coulometrically.

General information

• Status: Published.
• Publication date: August 2022 (published 31 August 2022).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.060 (Natural gas).
• Edition / version: Edition 2 (ISO 10101‑3:2022).
• Number of pages: 9 pages (ISO edition document).

Scope

Specifies a coulometric Karl Fischer method for measuring water in natural gas and other gases that do not react with Karl Fischer reagents. Applicable measurement range is approximately 5 mg/m3 to 5 000 mg/m3. Volumes are quoted at 273.15 K (0 °C) and 101.325 kPa (1 atm). The procedure covers sample introduction through the titration cell, generation of iodine coulometrically, and calculation of water content from the electric charge passed.

Key topics and requirements

• Principle of coulometric Karl Fischer titration for gaseous samples.
• Required apparatus and cell configuration for gas introduction and absorption.
• Reagents and reagent handling suitable for coulometric generation of iodine.
• Measurement range and reporting units (mg/m3; reference conditions 0 °C and 101.325 kPa).
• Sample handling and procedures to avoid contamination or loss of water.
• Calibration, validation, and calculation of results based on charge passed.
• Quality control and evaluation of measurement uncertainty for laboratory results.

Typical use and users

Used by gas analysis laboratories, natural gas producers, transmission and distribution operators, custody transfer testing services, equipment manufacturers (Karl Fischer coulometric analyzers), and research organizations. Typical applications include routine moisture monitoring, specification compliance testing, process control and custody transfer where low-level water determination in gas is required.

Related standards

Part of the ISO 10101 series on water determination in natural gas. See ISO 10101‑1:2022 (General requirements) and ISO 10101‑2:2022 (Titration procedure) for complementary methods and requirements. ISO 10101‑3:2022 replaces the earlier ISO 10101‑3:1993 edition.

Keywords

natural gas, water determination, Karl Fischer, coulometric, moisture analysis, gas analysis, sample handling, measurement uncertainty, KF reagent.

FAQ

Q: What is this standard?

A: ISO 10101‑3:2022 is the part of the ISO 10101 series that specifies the coulometric Karl Fischer procedure for determining water in natural gas and other non‑reactive gases.

Q: What does it cover?

A: It covers the principle and procedural steps of coulometric Karl Fischer titration for gaseous samples, the applicable concentration range (approx. 5 mg/m3 to 5 000 mg/m3), apparatus and reagent requirements, sample introduction, and calculation/reporting of results under specified reference conditions (0 °C, 101.325 kPa).

Q: Who typically uses it?

A: Gas laboratories, producers and transport operators, custody transfer testers, equipment manufacturers and researchers needing validated methods for low‑level moisture determination in gaseous fuels.

Q: Is it current or superseded?

A: It is the current edition published in August 2022 and replaces the withdrawn ISO 10101‑3:1993 edition.

Q: Is it part of a series?

A: Yes — ISO 10101 is a multi‑part standard on water determination in natural gas. Part 1 covers general requirements; Part 2 specifies a titration (volumetric) procedure; Part 3 covers the coulometric procedure.

Q: What are the key keywords?

A: Natural gas, Karl Fischer, coulometric, moisture, water content, gas analysis, KF titration.