Online monitoring system for ozone depletion substances

A monitoring system and ozone layer technology are applied in the field of online monitoring systems for ozone depleting substances in the atmosphere, which can solve the problems of inability to meet emission source inversion and low time resolution of data, and achieve improved removal of impurity interference, accurate results, and improved efficiency. Effect

Pending Publication Date: 2021-12-24
FUDAN UNIV
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Problems solved by technology

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  • Online monitoring system for ozone depletion substances
  • Online monitoring system for ozone depletion substances
  • Online monitoring system for ozone depletion substances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: System performance test.

[0029] 1.1 Test standard sample method

[0030] The performance test of the monitoring system uses 21 kinds of ODS standard samples for testing, and dilutes them to a concentration of 100ppt with a standard gas diluter for testing.

[0031] (1) Detection limit test:

[0032] With a reference volume of 100ppt standard gas of 2000ml, enter 1000ml of standard gas, conduct parallel tests for 3 consecutive times, and calculate the detection limit with 3 times the signal-to-noise ratio.

[0033] (2) Standard curve linear correlation:

[0034] With a reference volume of 100ppt calibration gas of 2000ml, 20ml, 50ml, 200ml, 500ml, 1000ml and 2000ml of volume calibration gas are respectively injected for testing. The corresponding sample concentration (sampling volume is 2000ml) is 1ppt, 2.5ppt, 10ppt, 25ppt, 50ppt and 100ppt, draw a calibration curve through the concentration and the peak area or peak height of the quantitative ion to ...

Embodiment 2

[0043] Example 2: Continuous monitoring of actual samples at the Shangdianzi National Atmospheric Background Station in Beijing.

[0044] 2.1 Basic situation of monitoring points

[0045]Shangdianzi Station is located in Miyun County, Beijing (117°07′E, 40°39′N, 293.3m above sea level), about 100km away from the center of Beijing, in the northeast of Beijing, in the hilly area of ​​Yanshan Mountains. Shangdianzi Station is one of the regional atmospheric background stations of the World Meteorological Organization / Global Atmospheric Observation Network (WMO / GAW), and it is also the national atmospheric composition background station of the Ministry of Science and Technology. The system is installed in an air-conditioned laboratory. The sampling port is located on the top of the 80m gradient observation tower. The total length of the sampling pipeline from the sampling port to the observation system is about 225m. The air is pumped into the room by the diaphragm pump through t...

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Abstract

The invention belongs to the technical field of atmospheric monitoring, and relates to an online monitoring system for ozone depletion substances. The system comprises a cold trap on-line sampling pre-concentration system combining semiconductor refrigeration with an ultra-strong adsorbent; an on-line low-temperature Nafion membrane water removal device is connected to a sample introduction end; the sampling pre-concentration system is sequentially connected with a gas chromatograph and a quadrupole mass spectrometer and is connected with a workstation computer of the pre-concentration gas chromatograph and quadrupole mass spectrometer. The system is mainly applied to continuous monitoring of ozone depletion substances (ODS) in ambient atmosphere and quantitative analysis of 21 ODS targets, and is good in compound separation degree and high in qualitative accuracy.

Description

technical field [0001] The invention belongs to the technical field of atmospheric monitoring, and in particular relates to an on-line monitoring system for ozone layer depleting substances in the atmosphere. Background technique [0002] Ozone is a trace gas composed of 3 oxygen atoms. It is mainly distributed in the stratosphere, and usually the maximum concentration occurs at a place 20-25km above the ground. Ozone in the stratosphere can absorb a large amount of ultraviolet radiation from the sun, which has an important impact on the earth's ecological system and atmospheric environment. Among them, most (95%) of the UV-B radiation that is particularly harmful to organisms is absorbed. It can be said that the ozone layer is The umbrella for life on Earth. [0003] Studies have found that chlorofluorocarbons, halons and other substances produced and used in industry, when they are released into the atmosphere and rise to the stratosphere, are irradiated by ultraviolet ra...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/72G01N30/86
CPCG01N30/02G01N30/06G01N30/72G01N30/8634
Inventor 李想蒋家奎陆冰清
Owner FUDAN UNIV
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