GB/T 42162-2022 in English
VALIDRubber, raw—Determination of residual monomers and other volatile low-molecular-mass compounds by capillary gas chromatography—Thermal desorption (dynamic headspace) method
- Issued on:2022-12-30
- Implemented on:2023-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 42162-2022生橡胶 毛细管气相色谱测定残留单体和其他挥发性低分子量化合物 热脱附（动态顶空）法》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC6（全国橡胶与橡胶制品标准化技术委员会合成橡胶分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Overview of GB/T42162-2022 Standard
This standard adopts thermal desorption (dynamic headspace)-capillary column gas chromatography technology to determine residual monomers and other volatile low molecular weight compounds in raw rubber. This method does not require the use of solvents and is applicable to all types of raw rubber.
Background and significance of standard formulation
With the development of the rubber industry, the requirements for product quality are increasing. The residual monomer content directly affects the performance and safety of rubber, so it is crucial to establish an accurate detection method. This standard is equivalent to ISO17052:2007 and is optimized in combination with China's national conditions.
Technical Principles
| Steps | Operation Instructions |
|---|---|
| Sample Preparation | The sample volume is about 0.25g. After homogenization, weigh 0.05g and put it into the desorption tube. |
| Thermal Desorption | Heated to the specified temperature, the volatile compounds enter the cold trap with the carrier gas for capture. |
| Chromatographic Analysis | The cold trap is heated up, and the compounds are introduced into the gas chromatograph for separation and quantification. |
Instrument and reagent requirements
Key instruments
- Gas chromatograph: equipped with capillary column and flame ionization detector.
- Laboratory open mill: in accordance with ISO2393.
- Micro syringe: capacity 1μL, accuracy 0.01μL.
Reagent requirements
All chemical reagents must be analytical grade, and the carrier gas can be dry high-purity nitrogen, helium or hydrogen.
Calibration and verification
The standard specifies a strict calibration process, including five-point calibration and single-point calibration. The linear range of the detector is calibrated by a dynamic headspace system, and the accuracy of the results is verified. It is recommended to use five-point calibration for the first application, and single-point calibration can be used for subsequent analysis.
Precision and implementation recommendations
Precision analysis
The precision data of residual monomers are derived from multiple inter-laboratory comparisons, and the results show that this method has high repeatability and reproducibility. Tables C.1 and C.3 list the precision parameters of different materials in detail.
Implementation recommendations
- Ensure the frequency of instrument calibration and regular maintenance of chromatographic columns and detectors.
- Operators must undergo professional training and be familiar with the principles and precautions of the dynamic headspace method.
- It is recommended to use the same batch of equipment for inter-laboratory comparisons to improve data reliability.
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