GB/T 32492-2016 in English
VALIDContent of dimethyl ether in liquefied petroleum gas by gas chromatography
- Issued on:2016-02-24
- Implemented on:2017-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 32492-2016液化石油气中二甲醚含量气相色谱分析法》由333（住房和城乡建设部）归口，主管部门为住房和城乡建设部。
Introduction
GB/T32492—2016 Professional interpretation of the gas chromatography analysis method for dimethyl ether content in liquefied petroleum gas
Background of standard formulation and technological evolution
As an important energy gas, the quality control of liquefied petroleum gas is of vital importance. The formulation of GB/T32492—2016 standard aims to standardize the determination method of dimethyl ether content in liquefied petroleum gas and ensure that the products circulating in the market meet the safety and environmental protection requirements.
With the continuous advancement of gas chromatography technology, this standard combines the advantages of modern chromatographic analysis and provides an accurate and efficient detection solution. The background of the standard formulation includes:
- Meet market supervision needs
- Ensure user safety and environmental protection requirements
- Promote the application of gas chromatography technology in gas detection
Method principle and operation steps
Method principle
This standard uses gas chromatography to separate dimethyl ether and other components in liquefied petroleum gas to achieve quantitative analysis. Its core principles include:
- The thermal conductivity detector (TCD) or hydrogen flame ionization detector (FID) of the gas chromatograph is used for sensitive detection.
- External standard calibration is performed using standard gases to ensure that the measurement results are accurate and reliable.
Operation steps
- Instrument preparation:Start the gas chromatograph and debug it according to the typical working conditions in Table 1.
- Standard gas introduction:Use national secondary standard materials or standard gas prepared according to GB/T5274 to determine the chromatographic peak value.
- Sample introduction:Use liquid phase sampling method to ensure the effective separation of dimethyl ether and other components in the sample.
- Qualitative and quantitative analysis:Calculate the content of dimethyl ether in the sample by retention time and external standard method.
Comparison of standard frameworks and technical requirements
| Project | Gas chromatograph requirements | Carrier gas type | Detector type |
|---|---|---|---|
| Basic configuration | Thermal conductivity detector (TCD) or hydrogen flame ionization detector (FID) | Helium or hydrogen | TCD/FID |
| Separation efficiency | Ensure effective separation of dimethyl ether from other components | Nitrogen or argon | - |
| Sensitivity requirements | Meet trace detection requirements | Hydrogen/Air | TCD/FID |
Implementation recommendations and precautions
Laboratory operating specifications
- Ensure that the instrument is calibrated and maintained regularly to maintain detection accuracy.
- The preparation of standard gas must be carried out in strict accordance with the requirements of GB/T5274 to ensure uniformity and stability.
- Avoid contamination during sample collection to ensure sample representativeness.
Quality control measures
- Perform instrument performance verification regularly, including separation and sensitivity checks.
- Both standard gas and sample analysis must be repeated to ensure data reliability.
- Operators must undergo professional training and be familiar with the working principle and operation process of gas chromatographs.
Actual Application Cases
A laboratory used the GB/T32492-2016 standard to test a batch of liquefied petroleum gas samples and found that the dimethyl ether content in some samples exceeded the standard. By adjusting the temperature of the chromatographic column and the carrier gas flow rate, the separation effect was significantly improved. The final average content of dimethyl ether measured was 0.8%, which met the national standard requirements.
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