GB/T 46550.1-2025Natural gas - Determination of odorant - Part 1: Determination of tetrahydrothiophene and non-sulfur odorant concentration by gas chromatography with photoionization detector (English PDF)
天然气 加臭剂的测定 第1部分：用光离子化气相色谱法测定四氢噻吩和无硫加臭剂含量
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 2, 2025
Implementation date
July 1, 2026
Scope
GB/T 46550.1-2025 is the English-translated version of 天然气 加臭剂的测定 第1部分：用光离子化气相色谱法测定四氢噻吩和无硫加臭剂含量.
GB/T 46550.1-2025 is the Chinese standard "Natural gas - Determination of odorant - Part 1: Determination of tetrahydrothiophene and non-sulfur odorant concentration by gas chromatography with photoionization detector".
Its scope clause reads: This document describes the principle, reagents, and methods for determining the content of tetrahydrothiophene and sulfur-free odorant in natural gas using photoionization gas chromatography.
Materials, instruments, sampling, test procedures, data processing, precision and test reports. This document applies to offline, portable on-site, or continuous online detection of tetrahydrothiophene and sulfur-free odorant content in natural gas and similar gases.
The test range is 1 mg/m3 to.200 mg/m3. Its clauses include terms and definitions; principles.
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Document preview — GB/T 46550.1-2025
National Standard of the People's Republic of China
- ICS
- 75.060
- Classification
- E 24
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- Introduction
- 1.Scope
- 2 Normative References
- 3.Terms and Definitions
- 4.Principle
- 5.Reagents and Materials
- 5.1 Carrier Gas
- 5.2 Standard Material
- 5.3 Sampling Line
- 5.4 Sampling valves and pressure regulators
- 6 Instruments
- 6.1 Sample introduction system
- 6.2 Chromatographic column
- 6.3 Detector
- 7.Sampling
- 8.Experimental Procedure
- 8.1 Calibration
- 8.2 Sample Testing
- 9 Data Processing
- 9.1 Experimental Data Processing
- 9.2 Conversion between volume fraction and mass concentration
- 10 Precision
- 10.1 Repeatability
- 10.2 Reproducibility
- 11 Test Report
1 Scope
This document describes the principle, reagents, and methods for determining the content of tetrahydrothiophene and sulfur-free odorant in natural gas using photoionization gas chromatography.
Materials, instruments, sampling, test procedures, data processing, precision and test reports.
This document applies to offline, portable on-site, or continuous online detection of tetrahydrothiophene and sulfur-free odorant content in natural gas and similar gases.
The test range is 1 mg/m3 to.200 mg/m3.
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 this document, only the version corresponding to that date applies. For undated references, the latest version (including all amendments) applies.
This document.
GB/T 5274.1 Preparation of gas mixtures for gas analysis calibration - Part 1.Preparation of primary gas mixtures by weighing method
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
GB/T 13609 Natural Gas Sampling Guidelines
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Using an ultraviolet lamp as a light source, the substances in the sample are ionized. The electrons and positively charged ions produced by ionization form a weak current under the influence of an electric field.
Current, a detector that determines the content of a substance by detecting the intensity of the current.
3.2 non-sulfurodorant
Odorants consisting of compounds or mixtures thereof that do not contain sulfur atoms and have a warning odor.
Note. The sulfur-free odorant is a mixture of methyl acrylate and ethyl acrylate in a certain proportion.
4 Principles
The sample to be tested was compared with a standard substance containing known amounts of tetrahydrothiophene and a sulfur-free odorant under the same operating conditions via chromatographic column chromatography.
After passing through a photoionization detector, the gas is illuminated by ultraviolet light of a specific wavelength emitted by an ultraviolet light source. The gas contains tetrahydrothiophene and sulfur-free...
When an odorant is bombarded with ultraviolet light, it ionizes and splits into two groups with positive and negative charges. The charged group is attracted by the electrode voltage and tends to the corresponding charge.
The electrode generates a current proportional to the concentrations of tetrahydrothiophene and the sulfur-free odorant. This is achieved by comparing the test sample with known tetrahydrothiophene and sulfur-free odorant concentrations.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 13609-2025 — Natural gas - Gas sampling
GB/T 5274.1-2018 — Gas analysis -- Preparation of calibration gas mixtures -- Part 1: Gravimetric method for class I mixtures
GB/T 8170-2008 — Rules of rounding off for numerical values & expression and judgement of limiting values
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