Electrochemical method for indirect determination of hydroxyl radicals in atmosphere
A free radical and electrochemical technology, applied in the direction of material electrochemical variables, etc., can solve the problems of expensive, high requirements for instruments and operations, and achieve the effect of low equipment, single product, and reduced detection costs
Inactive Publication Date: 2018-07-27
YANGZHOU UNIV
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[0003] At present, many OH detection methods have been studied, mainly including laser-induced fluorescence, chemical ionization mass spectrometry, electron spin resonance spectroscopy and high-performance liquid chromatography. These methods have high requirements for instruments and operations, and require expensive instruments and Only after professional training can it be operated
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[0024] First, prepare the sensor:
[0025] The concentration of sulfuric acid solution was 0.5 mol / L sulfuric acid diluted solution.
[0026] The clean carbon electrode is sequentially subjected to electrochemical activation treatment of anodic polarization, cathodic polarization and cyclic voltammetry in the above-mentioned dilute solution of sulfuric acid to obtain an electroactive electrode.
[0027] The above anodic polarization was potentiostatic +2.0 V for 60 s.
[0028] Cathodic polarization was potentiostatic -1.0 V for 60 s.
[0029] The final cyclic voltammetry potential ranged from -0.5 to + 0.8 V, and the cycle was repeated 3 times.
[0030] The obtained electroactive electrodes and clean carbon electrodes were subjected to cyclic voltammetry responses respectively to obtain figure 1 ,Depend on figure 1 The cyclic voltammetry response of the sensor of the present invention to 3,4-dihydroxybenzoic acid (curve a) and the response of the untreated bare electrode (...
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Abstract
The invention discloses an electrochemical method for indirect determination of hydroxyl radicals in atmosphere, and relates to a determination technique of 3,4-dihydroxybenzoic acid and hydroxyl radicals. The method comprises the steps: firstly, obtaining a linear relationship diagram between the peak current and the concentration of 3,4-dihydroxybenzoic acid; carrying out mixed reaction of a p-hydroxybenzoic acid solution with FeSO4, Na2EDTA and H2O2, then putting an electroactive electrode into the reaction solution, and measuring to obtain the peak current; and obtaining the linear relationship diagram between the concentration of 3,4-dihydroxybenzoic acid and the concentration of the hydroxyl radicals in the atmosphere according to the linear relationship between the peak current andthe concentration of 3,4-dihydroxybenzoic acid, wherein the linear relationship diagram is used for determination of the hydroxyl radicals in the atmosphere. P-hydroxybenzoic acid is used as a hydroxyl radical trapping agent, has high reaction rate constant and selectivity and produces 3,4-dihydroxybenzoic acid with electrochemical activity, the product is singular, and separation and purificationare not needed.
Description
technical field [0001] The invention relates to the technical field of determination of 3,4-dihydroxybenzoic acid and hydroxyl radicals. Background technique [0002] Hydroxyl radicals (•OH) are known oxidants, the oxidizing power is second only to F 2 non-selective oxidant. It is considered to be the most important oxidant in the atmosphere, plays an important role in the photooxidative cycle, and controls the autoxidative capacity of the atmosphere. Under normal climatic conditions, •OH controls the oxidative power of the natural atmosphere. • OH concentrations can help assess pollution levels, climate change, atmospheric photochemical activity and PM 2.5 formation rate. Therefore, measuring the concentration of •OH is of great significance in the field of life and environmental sciences. [0003] At present, many OH detection methods have been studied, mainly including laser-induced fluorescence, chemical ionization mass spectrometry, electron spin resonance spectros...
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Login to View More IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 胡效亚王彤彤徐琴
Owner YANGZHOU UNIV