Parallel air pollutant detection device and method based on mass spectrometry

A technology for air pollutants and detection devices, applied in measuring devices, mass spectrometers, electrical components, etc., can solve problems such as inconsistent gas exchange efficiency of gas exchange devices, affecting the accuracy of air pollutant detection results, and affecting real-time online detection of mass spectrometers, etc. , to achieve consistent exchange efficiency, simple assembly, and space-saving effects

Pending Publication Date: 2020-10-09
RATECTION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, limited by the detection conditions of mass spectrometry, it is necessary to set up a very long gas exchange device for gas exchange, so as to ensure that the detection gas flowing out of the gas exchange device meets the requirements of mass spectrometry gas detection, and the long-distance gas exchange device occupies a large space , the gas exchange efficiency is low, which greatly affects the real-time online detection of mass spectrometry
If multiple sets of equipment are tested at the same time, the gas exchange efficiency of each gas exchange device will be inconsistent, which will affect the accuracy of mass spectrometry for air pollutant detection results

Method used

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  • Parallel air pollutant detection device and method based on mass spectrometry
  • Parallel air pollutant detection device and method based on mass spectrometry
  • Parallel air pollutant detection device and method based on mass spectrometry

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as Figure 1~3 As shown, a mass spectrometry-based parallel air pollutant detection device includes a mass spectrometer (4), an air splitter (2), a carrier gas equalization device (6) and six gas exchange devices (3). The air distribution device (2) is made of hard material and includes an air intake trunk and 6 connected outflow branches. The air intake trunk is connected to the air pump (1) through a hose. The carrier gas equalization device (6) is made of stainless steel, including a hollow cylindrical device body, and an air inlet passage (61), an adjustment passage (63) and six outlet passages (62) integrally connected with the device body. The passage (61) is arranged on a top surface of the cylinder, the carrier gas source communicates with the A' end of the inlet passage (61) through a hose, and the outlet passage (62) is evenly distributed on the same plane of the cylinder side wall ( image 3 in the vertical plane). The regulating passage (63) is arrang...

Embodiment 2

[0044] Different from Embodiment 1, the device body of the carrier gas equalization device (6) is a hollow cuboid, the air inlet passage (61) is arranged on one side of the cuboid, and there are four outlet passages (62), which are respectively arranged on the air inlet passage (61) on one side of the adjacent surface, the adjustment channel (63) communicates with any side of the device body (see image 3 ). Four gas exchange devices (3) and air distribution devices (2) containing four outflow branches are arranged correspondingly, and the above devices are connected by hoses respectively.

[0045] When the length of the gas exchange device is set to 1m, the parameters are adjusted, and the gas exchange flowing out of each gas exchange device can reach 99.999%. However, under the same conditions, installing a gas exchange device requires a length of 4m, which occupies a relatively large space and has low efficiency.

Embodiment 3

[0047] The process of detecting heavy metals in the air using the device of Embodiment 1 or Embodiment 2 of the present invention is as follows: install the whole system on the mobile platform, transport the mobile platform to the side of the road, and turn on the carrier gas source, air pump, mass spectrometer and other instruments. The argon gas enters the outer tubes of each gas exchange device respectively through the carrier equalization device, so that the argon gas in circulation is kept in the outer tubes. The air to be tested is pumped into the air splitter device and enters the inner tubes of each gas exchange device to exchange gas with the argon in the outer tubes. Since the inner tube is a microporous membrane structure, N and O in the air can freely pass through the inner tube, but it has little effect on the concentration of pollutants in the air. After the exchanged gas meets the requirements of the mass spectrometer, it flows out and merges through the D end o...

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Abstract

The invention relates to the technical field of environmental monitoring, in particular to a parallel air pollutant detection device based on mass spectrometry and a method for detecting air pollutants by using the same. The device comprises a mass spectrometer, an air distribution device, a carrier gas balancing device and a plurality of gas exchange devices. The air distribution device and the carrier gas balancing device respectively distribute the detected air and the carrier gas, and the air enters each gas exchange device for gas exchange, so that the gas exchange efficiency is improved.And compared with a single gas exchange device, the equipment space is greatly saved, the accuracy of mass spectrum detection is not influenced, and the detection limit is low.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a mass spectrometry-based parallel air pollutant detection device and detection method. Background technique [0002] In the environment, sulfur dioxide, nitrogen dioxide, PM10, PM2.5, carbon monoxide, ozone and aerosols have become the main pollutants in the atmosphere. At present, the concentration of air pollutants is detected by mass spectrometry, and there are usually two situations for pre-treatment. One is to pre-process the relevant gas samples to obtain liquid samples, and then pass the liquid samples into the mass spectrometer through a peristaltic pump for detection. This kind of pretreatment process is complicated, takes a long time, and has a high detection limit, so it cannot directly detect air pollutants in real time. The other is to realize the direct detection of air pollutants by mass spectrometry through gas exchange of the air to be detecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62H01J49/04H01J49/26
CPCG01N27/62H01J49/0427H01J49/26
Inventor 钟华强
Owner RATECTION CO LTD
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