GB/T 43503-2023
Natural gas—Determination of oxygen—Electrochemical method (English Version)

Standard No.

GB/T 43503-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 43503-2023

Introduction

1. Background and significance of standard formulation

As natural gas as a clean energy continues to account for a larger share of the energy structure, the need for quality control and safety testing is becoming increasingly urgent. Oxygen content is one of the important indicators of natural gas composition, which is directly related to the safe operation of gas pipelines and the application performance of users.

2. Comparison of standard frameworks

Standard dimensions	GB/T 43503—2023	References (such as ASTM D7607)	Difference analysis
Scope of application	Determination of oxygen content in natural gas (volume fraction: $0.0001\% \sim 1.0\%$)	Covering a variety of gas fuels	Referencing the dedicated detection range for natural gas
Determination principle	Electrochemical method, based on the electrochemical reaction of oxygen molecules	Similar but no explicit mention of sensor type	Added specific requirements for sensor performance
Reagents and instruments	Specified the technical indicators of oxygen standard materials, nitrogen purity and electrochemical sensors	No specific sensor technical details	Added sensor verification requirements

3. Recommendations for standard implementation

3.1 Selection and calibration of measurement system

When selecting an oxygen content measurement system, the following points should be given priority:

• Ensure that the performance of the pre-treatment unit (such as filter, pressure controller) meets the standard requirements.
• The detection limit of the electrochemical sensor must be lower than $0.0001\%$ to meet the accurate measurement of low concentration oxygen content.
• Calibrate using standard materials regularly and record the calibration results for inspection.

3.2 Data Processing and Quality Control

During data processing, special attention should be paid to the following matters:

• Repeatability and reproducibility are key indicators to ensure the reliability of measurement results and should be verified in strict accordance with standard requirements.
• For abnormal data, the reasons should be recorded in detail and analyzed, and re-sampled and measured if necessary.
• The measurement report should contain complete sample information, instrument status and operator information.

GB/T 43503-2023 Referenced Document

• GB/T 13609 Natural gas sampling guidelines
• GB/T 20604 Natural gas Vocabulary

GB/T 43503-2023 history

• 2023 GB/T 43503-2023 Natural gas—Determination of oxygen—Electrochemical method

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