GB/T 8038-2023 in English
VALIDCoking toluene—Determination of hydrocarbon impurities—Gas chromatography
- Issued on:2023-09-07
- Implemented on:2024-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 8038-2023焦化甲苯 烃类杂质含量的测定 气相色谱法》由TC469（全国煤化工标准化技术委员会）归口，TC469SC3（全国煤化工标准化技术委员会炼焦化学分会）执行，主管部门为国家标准委。
Introduction
Interpretation of GB/T 8038—2023, the National Standard of the People's Republic of China
Analysis of the background of the standard and the technical evolution
GB/T 8038—2023 is a standard for the gas chromatography determination of hydrocarbon impurities in coking toluene, which replaces the previous GB/T8038—2009. This standard mainly conducts quantitative analysis of impurities such as benzene, C₈ aromatics and non-aromatics in coking toluene.
The technical evolution of this standard is reflected in many aspects: first, the scope of application is adjusted and the determination object is clarified; second, the requirements for chromatographic columns and stationary phases are optimized to improve the separation effect; finally, the area normalization method is introduced to enrich the detection means.
Comparative analysis of internal standard method and area normalization method
| Project dimension | Internal standard method | Area normalization method |
|---|---|---|
| Scope of application | Low impurity content (mass fraction: 0.01%～0.03%) | Wide impurity content (mass fraction: 0.002%～1.60%) |
| Detection principle | Quantification using internal standard, relying on relative correction factor | Based on peak area normalization, considering relative correction factor |
| Operation complexity | High, need to accurately control the amount of internal standard added | Low, high demand for automated data processing |
Comparison of standard frameworks and implementation suggestions
Case study: practical application of internal standard method
A coking enterprise used the internal standard method to detect the impurity content in toluene, and selected n-decane as the internal standard. By adjusting the temperature of the chromatographic column and the carrier gas flow rate, benzene, ethylbenzene and other components were successfully separated, and reliable quantitative results were obtained. The repeatability error of this method was controlled within 0.05%.
Implementation suggestions
- Give priority to experienced technicians to operate to ensure data accuracy;
- Flexibly select the internal standard method or area normalization method according to the impurity content range of the sample;
- Regularly calibrate the instrument to ensure the separation effect of the chromatographic column;
- Establish a standard curve to verify the linear relationship of the method.
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