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NO2 conversion system and method for detecting content of NO2 in gas by using system

A technology for gas sampling and gas sampling, which is applied in the field of analysis and detection, can solve problems such as slow reaction process, easily disturbed test results, and lengthy operation steps, and achieve high accuracy, simple structure, and good repeatability.

Pending Publication Date: 2020-07-28
SHANDONG NON METALLIC MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For NO in the prior art 2 The gas detection operation steps are long, the reaction process is slow, and the test results are easily disturbed. The invention discloses a NO 2 Conversion system and detection of NO in gas by using the system 2 The gas conversion system of the present invention has a simple structure, realizes automatic operation through a comprehensive control platform, has the integrated functions of sampling and rapid conversion, and is suitable for the rapid conversion of nitrogen dioxide in gas

Method used

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  • NO2 conversion system and method for detecting content of NO2 in gas by using system
  • NO2 conversion system and method for detecting content of NO2 in gas by using system
  • NO2 conversion system and method for detecting content of NO2 in gas by using system

Examples

Experimental program
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Effect test

Embodiment 1

[0045] NO in Example 1 2 transformation system such as figure 1 As shown, the sampling bottle 5 used is a 150mL fixed-volume sampling bottle, the absorption unit 12 is three 25ml porous glass plate absorption tubes connected in series, and the gas washing bottle 11 is a 500mL gas washing bottle; when in use, each porous glass plate of the absorption unit 12 Inject 20ml concentration of 0.2mol / L potassium hydroxide absorption solution into the absorption tube, and inject 400ml concentration of 1mol / L potassium hydroxide solution into the gas washing bottle 11 .

[0046] A sample of gas (nominal content of nitrogen dioxide: 200 μmol / mol) collected in an aluminum alloy gas cylinder, its NO 2 Transformation and detection methods are as follows:

[0047] (1) First, open the gas sample to be measured (gas in the aluminum alloy cylinder), pressure reducing valve I1, single-way solenoid valve 3, three-way solenoid valve I4, three-way solenoid valve II7, three-way solenoid valve III9...

Embodiment 2

[0065] NO in Example 2 2 transformation system such as figure 1 As shown, the sampling bottle 5 used is a 300mL fixed-volume sampling bottle, the absorption unit 12 is five 15ml porous glass plate absorption tubes connected in series, and the gas washing bottle 11 is a 500mL gas washing bottle. During use, inject 10ml concentration into each porous glass plate absorption tube and be the potassium hydroxide absorption solution of 0.1mol / L, inject 500ml concentration into the gas washing bottle 11 and be the potassium hydroxide solution of 1mol / L. Flowmeter I2, flowmeter II15, and flowmeter III17 are 200mL / min, and other setting conditions are the same as in Example 1;

[0066] A collection of gas in aluminum alloy gas cylinders (nominal content of nitrogen dioxide: 100 μmol / mol);

[0067] Its NO 2 Transformation and detection method are identical with embodiment 1;

[0068] The nitrogen dioxide content in the gas sample was measured 6 times, the average value of the measure...

Embodiment 3

[0070] NO in Example 3 2 transformation system such as figure 1 As shown, the sampling bottle 5 used is a 100mL constant-volume sampling bottle, the absorption unit 12 is two 50ml porous glass plate absorption tubes connected in series, and the gas washing bottle 11 is a 500mL gas washing bottle. When in use, inject 40ml concentration of potassium hydroxide absorption liquid of 0.05mol / L into each porous glass plate absorption tube, and inject 500ml concentration of potassium hydroxide solution of 1mol / L in the gas washing bottle 11; Ⅱ15, flow meter Ⅲ17 is 150mL / min;

[0071] A method for collecting gas (nominal content of nitrogen dioxide: 50 μmol / mol) samples in aluminum alloy gas cylinders;

[0072] Its NO Conversion and detection method are identical with embodiment 1;

[0073] The nitrogen dioxide content in the gas sample was measured 6 times, the average value of the measurement results was 50.7 μmol / mol, and the relative error was 1.4%.

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Abstract

The invention discloses an NO2 conversion system and a method for detecting the content of NO2 in gas by using the system, and belongs to the technical field of analysis and detection. The NO2 conversion system comprises a flow meter I, a sampling bottle, a mixing chamber, a gas washing bottle, an absorption unit, a flow meter II and a flow meter III; the system consists of a gas sampling system,a pipeline purging system and a conversion system, and automatic operation is realized through the comprehensive control platform; a sampling and rapid conversion integrated function is realized; theNO2 conversion system and method are suitable for rapid conversion of nitrogen dioxide in gas, an ion chromatography-mass spectrometry method with high sensitivity and high accuracy to inorganic anions is used as a testing means, nitrogen dioxide in gas is completely converted into nitrate ions for testing, and then the measured concentration of nitrate ions is converted into the content of nitrogen dioxide in gas.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, in particular to a NO 2 Conversion system and detection of NO in gas by using the system 2 content method. Background technique [0002] Nitrogen dioxide is a reddish-brown gas that is easily soluble in water and has a strong irritating effect on the eyes, nasal cavity, respiratory tract and lungs. Nitrogen dioxide and water combine to form nitric acid, which corrodes and destroys lung tissue and can cause lung cancer. Facial swelling. Industrial waste gas and domestic waste gas (such as NO 2 , SO 2 、H 2 S, CO, etc.) emissions are also increasing day by day, and the environmental pollution problems (such as smog, acid rain, greenhouse effect, etc.) that people are facing are also becoming more and more serious. Therefore, effective monitoring and management of the emission of polluting gases has become an indispensable means of governance. As a typical pollutant gas in indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96G01N30/72G01N30/06G01N30/24
CPCG01N30/06G01N30/24G01N30/72G01N30/96
Inventor 荀其宁张文申宋磊辛宗伟胡国星许峰侯倩倩李胜凯朱天一冀克俭
Owner SHANDONG NON METALLIC MATERIAL RES INST
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