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Hydroxy free radical concentration determination method

A measurement method and free radical technology, applied in special data processing applications, instruments, fluorescence/phosphorescence, etc., can solve the problems of multiple factors, complex mechanisms, and poor accuracy of measurement accuracy

Inactive Publication Date: 2008-08-13
JIANGSU UNIV
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Problems solved by technology

[0007] Chinese invention patent discloses two kinds of measuring methods of hydroxyl radicals (CN1412553 and CN101042371), use isopropanol and p-hydroxybenzoic acid respectively as capture agent, because mechanism is complicated, the factor that affects measurement accuracy is many and easily causes systematic error; For intermediate For the determination of products, gas chromatography has high accuracy but the operation is cumbersome, while the measurement by response current potential is easy to operate but the accuracy is slightly worse

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  • Hydroxy free radical concentration determination method

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Embodiment

[0030] The concentration of hydroxyl radicals generated by the high-voltage pulse discharge system in the liquid was measured. Configure 5×10 in a beaker with distilled water -4 M concentration of sodium terephthalate solution 1L, stirred with a magnetic stirrer, overnight, ready to use. Use 0.1mol / L NaCl solution to adjust the conductivity of the solution to 150μs / cm. The configured solution is placed in the reaction vessel of the high-voltage pulse discharge device in the liquid, and O is passed into the reactor at a flow rate of 400ml / min. 2 After 10 minutes, start the system power supply, the peak voltage is 60kV, take 5.00ml of the reaction solution once at 15min and 30min after the reaction, and add 5.00ml of sodium phosphate buffer solution with pH=7.4. Fluorescence of the solution was measured by a fluorescence spectrophotometer, the peak area of ​​the excitation-emission spectrum characteristic map was calculated, and the quantitative analysis of 2-hydroxyterephthal...

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Abstract

The present invention provides a method for detecting concentration of hydroxyl radical. In the system produced by adding capture agent terephthalic acid sodium salt (NaTA) into hydroxyl radical, 2-hydroxyl terephthalic acid (HTA) is produced by reaction of terephthalic acid sodium salt and hydroxyl radical, which has stable fluorescence and is detected by fluorescence spectrophotometer (excited wavelength lambada ex=315 nm, projecting wavelength lambada em=425 nm), and then the concentration of 2-hydroxyl terephthalic acid is conversed to the concentration of hydroxyl radical. The detecting method of present invention is easy to do, credibility and nicety, especial for used in the conditions of circumstance produced hydroxyl radical at the value of pH<12, or the solution of the hydroxyl radical produced system required the conductivity.

Description

technical field [0001] The invention relates to a method for measuring hydroxyl radicals, which uses sodium terephthalate as a hydroxyl radical scavenger to generate 2-hydroxyterephthalic acid, and then uses a fluorescence spectrophotometer to indirectly measure hydroxyl radicals. Background technique [0002] Since the hydroxyl radical is an extremely active substance, its reaction rate with most compounds is very fast so that its existence life is within 10 -9 s order of magnitude, so the determination of hydroxyl radicals is very difficult, and it is also a research hotspot in the scientific community. [0003] At present, there are many literatures on the determination of hydroxyl radicals at home and abroad, which are mainly divided into direct determination and indirect determination. [0004] The direct determination method is mainly represented by electron spin resonance spectroscopy (ESR), but the disadvantage of this method is that the sensitivity is not enough, a...

Claims

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Application Information

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IPC IPC(8): G01N21/64G06F19/00
Inventor 吴春笃张波储金宇杨峰许小红依成武姚钰
Owner JIANGSU UNIV
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