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Ozone gas phase titration standard device and source tracing method

A standard device, phase titration technology, applied in the direction of chemical analysis by titration, can solve the problems of large uncertainty value, poor stability, strong adsorption of nitrogen dioxide, etc., to achieve accurate and reliable concentration, avoid sensitivity and accuracy The effect of poor degree and complete and clear traceability chain

Pending Publication Date: 2021-09-17
NAT INST OF METROLOGY CHINA
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Problems solved by technology

[0002] The existing ozone concentration measurement standard traceability methods are divided into two categories. One is based on the Lambert-Beer law, which links the accurate measurement of ozone concentration with various physical parameters and spectral absorption coefficients in the Lambert-Beer law. Ozone standard photometer (SRP) measurement reference device, the range of this type of device does not exceed 1 μmol / mol; the other type is to use the quantitative and rapid reaction of ozone and nitric oxide to perform gas phase titration, and trace the ozone concentration to the nitric oxide standard gas At present, the range of this type of device does not exceed 1 μmol / mol, and it only uses a nitrogen dioxide analyzer to measure the concentration of nitrogen dioxide produced. Due to the strong adsorption of nitrogen dioxide and poor stability, the measurement is affected by many factors, so The measurement uncertainty is large

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  • Ozone gas phase titration standard device and source tracing method

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Embodiment 1

[0054] The invention provides a standard device for ozone gas phase titration, such as figure 1 As shown, it includes: nitrogen monoxide standard gas high pressure cylinder 1, nitrogen dioxide standard gas high pressure cylinder 2, first three-way joint 3, gas phase titration chamber 4, second three-way joint 5, third three-way joint 6 , back pressure valve 7, four-way valve 8, fourth three-way joint 9, nitrogen dioxide gas analyzer 10, nitrogen monoxide gas analyzer 11, ozone generator 12, four-way joint 13 and standard ozone gas analyzer 14 ;

[0055] The nitric oxide standard gas high-pressure gas cylinder 1 is connected with a first three-way joint 3, and the first three-way joint 3 is connected with the gas phase titration chamber 4 and the four-way valve 8 through gas pipelines respectively;

[0056] Nitrogen dioxide standard gas high-pressure gas cylinder 2 is connected with a second three-way joint 5, and the second three-way joint 5 is connected with gas phase titrat...

Embodiment 2

[0071] The present invention also provides a method for tracing the source of ozone gas concentration, which is carried out as follows:

[0072] Step 1, the ozone produced by nitric oxide standard gas and ozone generator 12 carries out gas phase titration in gas phase titration chamber 4:

[0073] NO+O 3 →NO 2 +O 2 (1)

[0074] Control the amount of ozone entering the gas phase titration chamber 4 so that it is not higher than the amount of nitric oxide standard gas entering the gas phase titration chamber 4;

[0075] Step 2, by controlling the four-way valve 8, the second interface 802 is communicated with the third interface 803, so that the concentration of the nitric oxide standard gas can be measured by the nitric oxide gas analyzer 11 to calibrate the nitric oxide gas analyzer 11, to make the measured value accurate (calibration of the nitric oxide analyzer 11: pass the nitric oxide standard gas to the nitric oxide analyzer, adjust and calibrate the indication value...

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Abstract

The invention provides an ozone gas phase titration standard device and a source tracing method, and belongs to the technical field of ozone concentration accurate measurement standards. The device comprises a nitric oxide standard gas high-pressure gas cylinder which is respectively connected with a gas phase titration cavity and a four-way valve; a nitrogen dioxide standard gas high-pressure gas cylinder which is respectively connected with the gas phase titration cavity and the four-way valve, wherein the gas phase titration cavity is connected with the four-way valve, and the four-way valve is also respectively connected with a nitric oxide analyzer and a nitrogen dioxide analyzer; and an ozone generator which is respectively connected with a gas phase titration cavity, a standard ozone gas analyzer and a detected ozone gas analyzer. The concentration of the ozone gas is measured by measuring the reduction amount of the nitric oxide and the increase amount of the nitrogen dioxide so that the influence of system deviation of the nitrogen dioxide gas analyzer and the nitric oxide gas analyzer on the measurement of the concentration of the ozone gas is avoided; the test initial value of the nitrogen dioxide gas analyzer is improved by introducing the nitrogen dioxide standard gas, and the measurement accuracy can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of accurate measurement standards for ozone concentration, and in particular relates to an ozone gas phase titration standard device and a traceability method. Background technique [0002] The existing ozone concentration measurement standard traceability methods are divided into two categories. One is based on the Lambert-Beer law, which links the accurate measurement of ozone concentration with various physical parameters and spectral absorption coefficients in Lambert-Beer’s law, such as the globally adopted Ozone standard photometer (SRP) measurement reference device, the range of this type of device does not exceed 1 μmol / mol; the other type uses the quantitative and rapid reaction of ozone and nitric oxide to perform gas phase titration, and traces the ozone concentration to the nitric oxide standard gas At present, the range of this type of device does not exceed 1 μmol / mol, and it only uses a nitrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 刘沂玲王德发郝静坤刘春宇蔡春洪曾武李紫晗
Owner NAT INST OF METROLOGY CHINA