GB/T 5832.3-2025Gas analysis — Determination of moisture in gases — Part 3: The method of cavity ring-down spectroscopy (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

This document is Part 3 of GB/T 5832 "Gas Analysis - Determination of Trace Moisture in Gases". GB/T 5832 has been published. The following section.

---Part 1: Electrolysis;

---Part 2: Dew Point Method;

---Part 3: Cavity Ring-Off Spectroscopy;

---Part 4: Quartz Crystal Oscillation Method.

This document replaces GB/T 5832.3-2011 "Determination of Trace Moisture in Gases - Part 3: Optical Cavity Ring-down Spectroscopy", and is consistent with... Compared with GB/T 5832.3-2011, apart from structural adjustments and editorial changes, the main technical changes are as follows.

---The scope has been changed (see Chapter 1, Chapter 1 of the 2011 edition);

---Terminology and definitions have been changed (see Chapter 3, Chapter 3 of the 2011 edition);

---The methodology has been modified (see Chapter 4, Chapter 4 of the 2011 edition);

---A new chapter on "Experimental Conditions" has been added (see Chapter 5);

---A new chapter on "Reagents and Materials" has been added (see Chapter 6);

---The requirements for instruments and equipment have been changed (see Chapter 7, Chapter 5 of the 2011 edition);

---The sampling requirements have been changed (see Chapter 8, 6.1 of the 2011 edition);

---The requirements for the test procedures have been changed (see Chapter 9, Chapter 6 of the 2011 edition);

---The requirements for processing experimental data have been changed (see Chapter 10, Chapter 7 of the 2011 edition);

---A new chapter on "Precision" has been added (see Chapter 11);

---A new chapter on "Quality Assurance and Control" has been added (see Chapter 12);

---The requirements for test reports have been changed (see Chapter 13, Chapter 8 of the 2011 edition).

Introduction

Moisture content is an important technical indicator for gases. To better meet the industry's requirements for the determination of trace moisture in gases, it is necessary to develop a complete system. Good series of analytical method standards.

GB/T 5832 aims to standardize the determination of trace moisture in gases and is proposed to be divided into the following four parts.

---Part 1: Electrolysis. The aim is to provide a test method for determining trace moisture in gases based on electrolysis.

---Part 2: Dew Point Method. The purpose is to provide a test method for determining trace moisture in gases based on dew point.

---Part 3: Cavity Ring-Off Spectroscopy. The aim is to provide an experimental method for determining trace moisture in gases based on cavity ring-off spectroscopy. method.

---Part 4: Quartz Crystal Oscillation Method. The aim is to provide an experimental method for determining trace moisture in gases based on quartz crystal oscillation. method.

Warning - Personnel using this document should have practical experience working in a formal laboratory. This document does not address all possible safety issues.

Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national regulations.

1 Scope

This document specifies the experimental method for determining trace moisture in gases using cavity ring-down spectroscopy, including the principle, experimental conditions, reagents and materials.

Specific requirements for materials, instruments and equipment, sampling, test procedures, test data processing, precision, quality assurance and control, test reports, etc.

This document applies to the determination of trace and ultra-trace moisture content in gases, with a determination range of 1.0 × 10^-9 (mole fraction) to 20 × 10^-6 (mole fraction).

This document does not apply to gases that can damage glass mirrors, such as hydrogen fluoride and fluorine; nor does it apply to gases that interfere with the absorption spectrum of water. Substances, such as silane, methane, and germanane.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 4842 Argon

GB/T 4844 Pure Helium, High-Purity Helium and Ultra-Purity Helium

GB/T 5274.1 Preparation of gas mixtures for gas analysis calibration - Part 1: Preparation of primary gas mixtures by weighing method

GB/T 5275.6 Gas analysis - Dynamic methods for preparing calibration mixed gases - Part 6: Critical flow through sharp orifices

GB/T 5275.7 Gas analysis - Preparation of calibration mixed gases by dynamic volumetric method - Part 7: Thermal mass flow controller

GB/T 5275.8 Gas analysis - Preparation of calibration mixtures by dynamic volumetric method - Part 8: Diffusion method

GB/T 5275.10 Gas analysis - Preparation of calibration mixed gases by dynamic volumetric method - Part 10: Permeation method

GB/T 8979 Pure Nitrogen, High-Purity Nitrogen and Ultra-Purity Nitrogen

GB/T 14850 Glossary of Gas Analysis

GB/T 43306 Sampling Guidelines for Gas Analysis

3 Terms and Definitions

The terms and definitions defined in GB/T 14850 and GB/T 43306, as well as the following terms and definitions, apply to this document.