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Method for detecting low-concentration free bromine by utilizing ultra-long optical fiber flow cell-spectrophotometric phenol red method and application of method

A spectrophotometric, free bromine technique used in the measurement of color/spectral properties, analysis by chemically reacting materials, and material analysis by observing the effect on chemical indicators

Pending Publication Date: 2021-09-10
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LWCC has the advantages of low sample consumption, simple operation, stable signal, and high sensitivity. It has been used in the quantitative detection of trace substances in the research environment, etc., but it has not yet been used for the quantitative detection of free bromine and the reaction kinetics analysis using ultra-long optical fiber flow cells. report

Method used

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  • Method for detecting low-concentration free bromine by utilizing ultra-long optical fiber flow cell-spectrophotometric phenol red method and application of method
  • Method for detecting low-concentration free bromine by utilizing ultra-long optical fiber flow cell-spectrophotometric phenol red method and application of method
  • Method for detecting low-concentration free bromine by utilizing ultra-long optical fiber flow cell-spectrophotometric phenol red method and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Detection of low-concentration free bromine using ultra-long optical fiber flow cell-spectrophotometric phenol red method

[0043] Bromide ions and free chlorine (HOCl and OCl - ) reaction will generate free bromine (HOBr and OBr - ), thus affecting the oxidation effect of free chlorine. Therefore, when studying the influence of bromide ions in the chlorination system, it is usually necessary to measure the concentration of free bromine oxidized by free chlorine. The specific measurement process is as follows:

[0044] (1) Prepare reaction system solutions containing 0, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5mg / L free bromine and add them to the ultra-long optical fiber flow cell, and use a peristaltic pump to pass acetic acid into the ultra-long optical fiber flow cell -sodium acetate buffer solution (weigh 6.00g CH 3 Dissolve COONa in a dry small beaker with a small amount of deionized water, add 9.00mL CH 3 CO0H, shake well and set the volume to 250mL) Adjust t...

Embodiment 2

[0047] Example 2 Using ultra-long optical fiber flow cell-spectrophotometric phenol red method to detect the self-attenuation rate of free bromine

[0048] To measure the self-degradation rate of free bromine, the specific determination process is as follows:

[0049] (1) Prepare a solution containing 50 μM free bromine (prepared and tested immediately, that is, the storage time is 0 min), take 10 mL and add it to the ultra-long optical fiber flow cell, and use a peristaltic pump to feed the acetic acid-sodium acetate buffer solution to adjust the pH of the mixed solution. to 4.6-4.7, then add phenol red to make the concentration of phenol red in the detection system reach 1.92mg / L; free bromine reacts with phenol red to form bromophenol blue, set the maximum absorption wavelength of the ultra-long optical fiber flow cell to 592nm, and the ambient temperature at 25°C, measure the characteristic absorption peak of bromophenol blue in the detection system at 592nm, and its absor...

Embodiment 3

[0054] Example 3 Detection of the photolysis rate of free bromine under ultraviolet light by ultra-long optical fiber flow cell-spectrophotometric phenol red method

[0055] To measure the photolysis rate of free bromine under ultraviolet light, the specific determination process is as follows:

[0056] (1) Prepare a reaction system solution containing 500 μM free bromine (prepared and measured immediately, that is, the ultraviolet light irradiation time is 0 min), take 10 mL and add it to the ultra-long optical fiber flow cell, and use a peristaltic pump to feed the acetic acid-sodium acetate buffer solution to mix The pH of the solution was adjusted to 4.6-4.7; then phenol red was added to make the concentration of phenol red in the detection system reach 1.92mg / L; free bromine reacted with phenol red to generate bromophenol blue, and the maximum absorption wavelength of the ultra-long optical fiber flow cell was set to 592nm, the ambient temperature is 25°C, measure the cha...

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Abstract

The invention belongs to the technical field of free bromine concentration determination, and particularly relates to a method for detecting low-concentration free bromine by using an ultra-long optical fiber flow cell-spectrophotometric phenol red method and application of the method. Phenol red is used as a trapping agent of the free bromine and reacts with the free bromine to generate bromophenol blue, then the absorbance of bromophenol blue at 592 nm is measured by using an ultra-long optical fiber flow cell, and finally calculation is carried out according to a Lambert-Beer law to obtain the concentration of free bromine in the system to be measured; and meanwhile, the self-decay rate of the free bromine can be detected, the photolysis rate of the free bromine under ultraviolet light can be detected, the secondary reaction rate constant of the organic pollutants and the free bromine can be measured, and the like; according to the detection method, the detection lower limit of the free bromine concentration is greatly reduced, the detection process is simple, interference factors are few, the detection result is accurate, meanwhile, the detection cost is low, the precision is high, the range is wide, and the important value is achieved for research of oxide species in the water environment.

Description

technical field [0001] The invention belongs to the technical field of free bromine concentration measurement, and in particular relates to a method for detecting low-concentration free bromine by using an ultra-long optical fiber flow cell-spectrophotometric phenol red method and an application thereof. Background technique [0002] Since bromide ions are ubiquitous in natural water bodies, the commonly used disinfectants free chlorine (HOCl and OCl-) will react with bromide ions to form free bromine (also known as free bromine). The reaction rate of free bromine with organic pollutants such as phenols and amines is 1000 times higher than that of free chlorine, so it is considered to be one of the important oxides in the water environment. In saline wastewater and offshore water, free bromine plays an important role in the migration and transformation of pollutants. [0003] At present, there are few researches on the method of free bromine concentration determination, and...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N21/33
CPCG01N21/78G01N21/31G01N21/33
Inventor 杨欣赵钰洁程双双
Owner SUN YAT SEN UNIV
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