Electrochemical method for on-line determination of hydroxyl radicals in atmosphere

A free radical and electrochemical technology, applied in the direction of material electrochemical variables, measuring devices, scientific instruments, etc., can solve the problems of inability to realize online detection, cumbersome operation, complicated equipment, etc., and achieve low detection cost, simple manufacturing process, and easy operation simple effect

Active Publication Date: 2020-06-05
YANGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the common methods for detecting atmospheric hydroxyl radicals include laser-induced fluorescence method, gas expansion method, laser photon absorption method, chemical ionization mass spectrometry, etc. Most of these methods have complicated equipment, cumbersome operation, high cost, and inability to realize online detection, etc. shortcoming

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  • Electrochemical method for on-line determination of hydroxyl radicals in atmosphere
  • Electrochemical method for on-line determination of hydroxyl radicals in atmosphere
  • Electrochemical method for on-line determination of hydroxyl radicals in atmosphere

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Embodiment Construction

[0024] 1. Preparation of COF(TpBD)-CFP:

[0025] Dissolve trialdehyde phloroglucinol and benzidine in 1,4-dioxane and mesitylene, and obtain a homogeneous solution by ultrasonication. 2 O was removed from the reaction system by bubbling 2 , add acetic acid evenly and slowly, put the unmodified carbon fiber paper CFP vertically into the reaction solution and quickly transfer it to the reaction kettle, react in the oven, and prepare COF(TpBD)-CFP, its morphology is as follows figure 1 ,from figure 1 In a, it can be seen that COF (TpBD) is embedded on the surface of CFP, and the diameter of COF (TpBD) successfully modified on the surface of CFP is between 100-150nm, and the size is uniform and regular. figure 1 b It can also be seen that COF (TpBD) not only exists on the surface of CFP, but also covers the inner layer of CFP.

[0026] The dosage of trialdehyde group phloroglucinol is 10.5mg, the dosage of benzidine is 13.6mg, the dosage of 1,4-dioxane is 5ml, the dosage of mes...

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Abstract

The invention provides an electrochemical method for on-line determination of hydroxyl radicals in atmosphere, which comprises the following steps: by using COF(TpBD)-CFP as a working electrode, obtaining a linear relation graph between peak current and 2, 5-dihydroxybenzoic acid concentration; using the COF(TpBD)-CFP soaked with the salicylic acid solution for atmospheric sampling, then putting the sampled COF (TpBD)-CFP into a PBS buffer solution to be subjected to electrochemical measurement, and measuring a peak current value; and calculating the concentration of the atmospheric hydroxyl radicals in the sampling time according to the linear relationship between the peak current and the concentration of the 2, 5-dihydroxybenzoic acid so as to determine the atmospheric hydroxyl radicals.According to the invention, COF(TpBD) is used for modifying a conductive material CFP and then used as an impregnated membrane to combine collection and determination of atmospheric hydroxyl radicals, so the method has the advantages of high sensitivity, simple operation, strong stability, repeated utilization and the like, and realizes rapid, sensitive and on-line detection of atmospheric hydroxyl radicals.

Description

technical field [0001] The invention relates to a technique for measuring hydroxyl radicals in the atmosphere, in particular to an electrochemical method for on-line determination of hydroxyl radicals in the atmosphere. Background technique [0002] Hydroxyl radicals (·OH) play an important role in both oxidation reactions and atmospheric chemistry, and are the main active species in natural and polluted tropospheres as well as in the degradation reactions of organic matter during combustion. Accurately measuring the concentration of OH in the atmosphere, It is very important to fully understand the relevant chemical properties of OH in the troposphere, which can help us accurately predict the atmospheric self-purification and the formation of secondary atmospheric pollutants. [0003] At present, the common methods for detecting atmospheric hydroxyl radicals include laser-induced fluorescence method, gas expansion method, laser photon absorption method, chemical ionization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416G01N27/48
CPCG01N27/4162G01N27/48
Inventor 胡效亚黄志凌徐琴
Owner YANGZHOU UNIV
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