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Atmosphere peroxy radical sample-introduction apparatus and measuring instrument having atmosphere peroxy radical sample-introduction apparatus

A technology of peroxyl radicals and sampling devices, which is applied in the direction of sampling devices, measuring devices, color/spectral characteristics measurement, etc., to achieve the effects of low cost, reduced impact, and reduced loss of sample wall

Inactive Publication Date: 2018-06-29
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of atmospheric peroxygen free radical sampling device and the atmospheric peroxygen free radical measuring instrument with the device, in order to solve water effect, wall loss in existing chemical amplification method measurement atmospheric peroxygen free radical technology Realize high-sensitivity and accurate measurement of the relative humidity of the outside atmosphere

Method used

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  • Atmosphere peroxy radical sample-introduction apparatus and measuring instrument having atmosphere peroxy radical sample-introduction apparatus
  • Atmosphere peroxy radical sample-introduction apparatus and measuring instrument having atmosphere peroxy radical sample-introduction apparatus
  • Atmosphere peroxy radical sample-introduction apparatus and measuring instrument having atmosphere peroxy radical sample-introduction apparatus

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Embodiment 1

[0050] see figure 1 , the present invention provides a kind of atmospheric peroxygen free radical sampling device, comprising: a 70cm long, nanometer tube 1 of internal diameter 18mm, said nanometer tube is the MD 700 series of U.S. Perma Pure (Perma Pure), said The sheath gas sampling nozzle 13 of the nanotube is passed into the dry zero-level air with a relative humidity of about 6%, and the sheath gas sampling nozzle 12 is used for air extraction, and the sampling port 11 of the nanotube is connected to a 180 ° elbow 15. Elbow 15 is sampling end with respect to the far-end of accepting pipe, is used for atmospheric sampling, and the conical rainproof cover 16 of inversion is also equipped with at the elbow sampling end; One peroxygen free radical reaction chamber, it comprises buffer chamber 2, amplifying The cavity 3 and the reference cavity 4, the buffer cavity 2 are installed at the sample outlet end of the nanotube 1, the amplification cavity 3 and the reference cavity ...

Embodiment 2

[0057] see figure 2 , the atmospheric peroxygen free radical measuring instrument of this embodiment includes the atmospheric peroxyl free radical sampling device as in the above-mentioned embodiment 1, the amplification channel measurement broadband cavity 5 and the reference channel measurement broadband cavity 6 .

[0058] Further, the amplifying cavity sample 37 of the atmospheric peroxygen free radical sampling device is passed into the amplifying channel to measure the broadband cavity 5 at a sampling flow rate of 1.5L / min and perform NO 2 For gas concentration measurement, the sample 47 from the reference channel is passed into the reference channel to measure the broadband cavity 6 at a sampling flow rate of 1.5L / min and perform NO 2 gas concentration measurement, the two channels of NO 2 The gas concentration is used to calculate the concentration of peroxyl radicals in the atmosphere.

Embodiment 3

[0060] see image 3 , the reference channel measurement broadband cavity 5 has the same structure as the amplification channel measurement broadband cavity 6 . The amplification channel measurement broadband cavity 6 includes: a blue LED light source 51, a first optical fiber 52, a collimating lens 53, a broadband filter 54, a flow cavity 55, a focusing lens 56, a second optical fiber 57 and a spectrometer 58 connected in sequence.

[0061] Its working process is as follows: the output light of the blue LED light source 51 is transmitted by the first optical fiber 52, collimated by the collimator lens 53, and then enters the flow cavity 55 after being filtered by the broadband filter 54, and interacts with the sample to be tested in the flow cavity 55. After the action, the outgoing light is converged by the focusing lens 56 and then enters the optical fiber 57 and connected to the spectrometer 58 to obtain the signal to be measured. The flow cavity 55 includes a polytetraflu...

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Abstract

The invention discloses an atmosphere peroxy radical sample-introduction apparatus, which comprises a nano tube and a peroxy radical reaction chamber, and dried zero air is introduced into a sheath gas sample-introduction nozzle of the nano tube; the peroxy radical reaction chamber comprises a cushion chamber, an amplification chamber and a reference chamber, the cushion chamber is arranged at a sample outlet end, the amplification chamber and the reference chamber are arranged at a lower end of the cushion chamber in a parallel mode, and the cushion chamber is in a taper shape with a gradually increased diameter according to an atmosphere sample-introduction air-flow direction. The invention also discloses the atmosphere peroxy radical measuring instrument having the atmosphere peroxy radical sample-introduction apparatus. The atmosphere peroxy radical measuring instrument can effectively reduce the interference of atmosphere peroxy radical sample-introduction wall loss and water effect on a reaction chain length, and high-sensitivity accurate measurement of peroxy radical under practical different relative humidity of atmosphere is realized.

Description

technical field [0001] The invention relates to the technical field of atmospheric chemical measurement, in particular to an atmospheric peroxygen radical sampling device and an atmospheric peroxygen free radical measuring instrument provided with the device. Background technique [0002] Peroxy radicals (HO 2 +RO 2 , where R stands for any organic chain) is a key intermediate product produced in the oxidation process of atmospheric volatile organic compounds (VOCs), and plays an important role in the generation of atmospheric pollutants such as ozone and aerosol particles, and accurately measures peroxide in the atmosphere The concentration of free radicals is the key to understanding the process of atmospheric secondary pollution, and can provide a key scientific basis for formulating effective air pollution control policies. [0003] The concentration of peroxygen free radicals in the atmosphere is very low (pptv level), and the types are complex, so direct measurement ...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N21/25
CPCG01N1/2273G01N21/255
Inventor 方波赵卫雄张为俊
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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