Environmental air non -methane total hydrocarbon gas phase color spectrometer detection scheme

With the rapid development of industrialization, the problem of environmental air pollution caused by non -methane total hydrocarbons is becoming increasingly serious. In order to accurately monitor the content of non -methane total hydrocarbons, this article will introduce a detection solution for non -methane total hydrocarbons based on the gas color spectrum method.

Ⅰ. Detection principle

The gas chromatograph uses different substances to adsorb or dissolve the different substances on the chromatography column to separate various gas in the environment of the environment. By detecting the peak area of each component after being separated, the concentration of non -methane total hydrocarbons can be calculated.

Ⅱ. Operation process

1. Sampling: Set the sampling point in the area that needs to be detected. Use a vacuum pump to pump the ambient air into the glass syringe and keep it seal and save.

2. Sample pre -processing: The collected samples are used to remove impurities such as water vapor and particulate matter through pre -processing devices to prepare for subsequent chromatography analysis.

3. Analysis of gas chromatography: The processed samples are connected into the gas color spectrometer, and the separation of the color spectrum column on different components is used to separate the total hydrocarbons of non -methane from other gas.

4. Detection quantitative: detect the separated non -methane total hydrocarbons from the thermal detector or flame ionization detector, record the peak area or peak high. The standard curve method or internal standard method is used to calculate the concentration of non -methane total hydrocarbons.

5. Results output: According to the calculation results, the concentration value of non -methane total hydrocarbons in the output environment.

Ⅲ.Precautions

1. The selection of the sampling point should be representative and reflect the real situation of the regional environment.

2. Keep qi density during the sampling process to avoid leakage or pollution of samples.

3. Calibrate and maintain the gas chromatograph regularly to ensure stability and high accuracy of the instrument.

4. When processed before the sample, ensure that the impurities are removed well and avoid interference chromatography.

5. When performing quantitative calculations, choose the appropriate standard curve or internal standard material to ensure the accuracy of the results.

The use of gas color spectrometers to detect non -methane total hydrocarbons in the environment can quickly and accurately determine the concentration of non -methane total hydrocarbons. This solution has the advantages of simple operation, high sensitivity, and good repetitiveness, which can provide strong support for environmental monitoring and pollution control. At the same time, in order to ensure the accuracy of the test results, we must pay attention to the sampling representativeness, the calibration of instrument and maintenance.

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