GB/T 9722-2023 in English
VALIDChemical reagent—General rules for the gas chromatography
- Issued on:2023-08-06
- Implemented on:2024-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
《GB/T 9722-2023化学试剂 气相色谱法通则》由TC63（全国化学标准化技术委员会）归口，TC63SC3（全国化学标准化技术委员会化学试剂分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Interpretation of National Standard of the People's Republic of China GB/T 9722—2023: Application of Gas Chromatography in Chemical Reagents
| Standard Content | Requirements of the 2006 Edition | Updates to the 2023 Edition |
|---|---|---|
| Scope Definition | Applicable to the determination of organic chemical reagents containing volatile components | New qualitative analysis content and data quality assurance requirements |
| Composition of Gas Chromatograph | Including gas path, injection, separation and other systems | Add framework diagram and optimize the stability requirements of the whole machine |
| Chromatographic column parameters | Differentiation between capillary and packed columns | Refine the requirements for stationary phase, inner diameter, and liquid film thickness |
Explanation of professional terms and practical application cases
Asymmetry factor:A parameter that describes the degree of asymmetry of the chromatographic peak. The calculation formula is shown in Appendix B.1. In actual operation, if a component in the chromatogram has obvious peak tailing, it may be necessary to adjust the stationary phase or optimize the mobile phase conditions to improve the peak shape.
Effective plate height:An important indicator that reflects the efficiency of the chromatographic column. The calculation formula is $H_{\mathrm{eff}} = \frac{L}{n_{\mathrm{eff}}}$. When selecting a chromatographic column, it is necessary to comprehensively consider the sample properties and the analysis objectives, and select a chromatographic column with a suitable inner diameter and liquid film thickness to obtain the best separation effect.
Comparison of gas chromatograph performance requirements
New content of the new standard: The 2023 version adds specific indicators for the stability of the whole machine in terms of gas chromatograph performance, and clarifies that the baseline drift value should not exceed the range specified in JJG 700. At the same time, the requirements for the sensitivity of the whole machine have been deleted.
Qualitative and quantitative analysis methods
Qualitative analysis: New relative retention value qualitative and standard addition methods are added, which are suitable for situations where high-purity standard samples are not available. Unknown components can be effectively confirmed through literature query and chromatographic condition matching.
Quantitative analysis: The external standard method, internal standard method and normalization method quantitative methods each have their own advantages and disadvantages, and the selection needs to be comprehensively judged based on the sample characteristics and laboratory conditions. The 2023 version particularly emphasizes the application scenarios of the standard curve method, and it is recommended to use a standard solution with a mass fraction of not less than 5 to establish a working curve.
Implementation Recommendations
- Instrument Selection:Choose the appropriate column and detector type based on the properties of the components to be measured. For example, capillary columns are suitable for high-sensitivity analysis, while packed columns are suitable for large-volume samples.
- Operational Specifications:Strictly follow the standard requirements for peak area measurement and calculation to ensure data accuracy. For the treatment of overlapping peaks, the peak-to-peak method or the tangent method is preferred to reduce errors.
- Quality Control:Regularly check instrument performance, including column efficiency, separation, and detector sensitivity. It is recommended to add blank controls and quality control samples to each batch of samples to ensure reliable results.
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