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An Electrochemical Method for On-line Determination of Hydroxyl Free Radicals in the Atmosphere

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

Active Publication Date: 2022-03-29
YANGZHOU UNIV
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  • Abstract
  • Description
  • 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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  • An Electrochemical Method for On-line Determination of Hydroxyl Free Radicals in the Atmosphere
  • An Electrochemical Method for On-line Determination of Hydroxyl Free Radicals in the Atmosphere
  • An Electrochemical Method for On-line Determination of Hydroxyl Free Radicals in the 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 online determination of hydroxyl radicals in the atmosphere, which uses COF(TpBD)-CFP as a working electrode to first obtain a linear relationship diagram between peak current and 2,5-dihydroxybenzoic acid concentration; COF(TpBD)‑CFP of salicylic acid solution was used for atmospheric sampling, and then the sampled COF(TpBD)‑CFP was put into PBS buffer solution for electrochemical measurement, and the peak current value was measured; , The linear relationship of the concentration of 5-dihydroxybenzoic acid is used to calculate the concentration of atmospheric hydroxyl radicals during the sampling time, which is used to determine the atmospheric hydroxyl radicals. The invention uses COF (TpBD) to modify the conductive material CFP as an impregnating membrane to combine the collection and measurement of atmospheric hydroxyl radicals into one, and has the advantages of high sensitivity, simple operation, strong stability, and can be reused many times. The rapid, sensitive and on-line detection of atmospheric hydroxyl radicals is realized.

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 Patents(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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