GB/T 28726-2025Gas analysis - Gas chromatography with helium ionization detector (English PDF)

1 Scope

This document describes the principle, experimental conditions, and reagents for determining trace and ultra-trace components in gases using helium ionization gas chromatography.

Related to materials, instruments and equipment, sampling, test procedures, precision and measurement uncertainty, quality assurance and control, and test reports.

This document applies to the determination of trace and ultra-trace gaseous components. Trace and ultra-trace amounts of hydrogen, oxygen, nitrogen, methane, carbon monoxide, and carbon dioxide.

The carbon fraction was measured in the range of 10 × 10^-^9 (mole fraction) to 500 × 10^-^6 (mole fraction).

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.

This document.

GB/T 3358.2 Statistical vocabulary and symbols Part 2.Applied statistics

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

GB/T 4946 Gas Chromatography Terminology

GB/T 14850 Glossary of Gas Analysis

GB/T 43306 Sampling Guidelines for Gas Analysis

GB/T 45133 Gas Analysis - Determination of Composition of Gas Mixtures - Comparative Method Based on Single-Point and Two-Point Calibration

3 Terms and Definitions

The terms and definitions defined in GB/T 3358.2, GB/T 4946, GB/T 14850 and GB/T 43306 apply to this document.

4 Principles

Under specific chromatographic conditions, the analyte in the sample is separated by a chromatographic column and then enters a helium ionization detector to collect the analyte.

The number is quantified using the external standard method.

5 Test conditions

The operating environment should meet the following requirements.

---Temperature. 5°C~40°C;

---Relative humidity. 20%~85%;

---There is no strong electromagnetic interference, no corrosive gases, and no strong vibrations in the surrounding area;

---Power supply. AC voltage (220±22)V, frequency (50±0.5)Hz;

---Grounding requirements. The instrument must be reliably grounded (grounding resistance <= 4ohm).

GB/T 34710.3 | GB/T 34710.2 | GB/T 34710.1 | GB/T 28729 | GB/T 28727 | […]