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Method for measuring decolourization ratio of colored substance in solution

A technology of colored substances and decolorization rate, which is applied in the field of decolorization rate detection, can solve the problem of error between the effect and the actual treatment effect, and achieve the effect of accurate decolorization rate

Inactive Publication Date: 2014-03-12
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention proposes a method for measuring the decolorization rate of colored substances in a solution, which mainly solves the problem of calculating the decolorization rate in the prior art with the change of absorbance of mixed colored substances at the maximum absorption wavelength in the visible light range, As a result, there is a large error between the calculated effect and the actual processing effect.

Method used

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  • Method for measuring decolourization ratio of colored substance in solution
  • Method for measuring decolourization ratio of colored substance in solution
  • Method for measuring decolourization ratio of colored substance in solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The unpurified reactive brilliant orange K-GN, reactive brilliant red X-3B, reactive red 195, reactive blue 19 and reactive green 19, these 5 kinds of reactive dyes, each dye with the same weight, the preparation concentration is 100mg / L Mix the dye solution, measure the absorbance in the visible light wavelength range of 400nm-780nm by UV-visible spectrophotometer, and then calculate the area contained in the absorbance spectrum by the integral method, and the area is 157.6932.

[0046] Add 1 g of activated carbon to 100 ml of the above-mentioned mixed dye solution with a concentration of 100 mg / L, stir respectively for 5 min, 10 min and 20 min, and then centrifuge at a speed of 4000 rpm. The separated dye solution is measured by a UV-visible spectrophotometer. The absorbance within the visible light wavelength range of 400nm-780nm, and then calculate the area contained in the absorbance spectrum by the integral method, and the areas are 99.0544, 82.2214 and 78.9388 res...

Embodiment 2

[0049] Use unpurified acid blue, acid red and acid orange, these three acid dyes, use the same weight of each dye to prepare a mixed dye solution with a concentration of 100mg / L, and measure the concentration at 400nm-780nm by an ultraviolet-visible spectrophotometer. The absorbance in the visible light wavelength range, and then calculate the area contained in the absorbance spectrum by the integral method, and the area is 216.7201.

[0050] Add 1 g of activated carbon to 100 ml of the above-mentioned mixed dye solution with a concentration of 100 mg / L, stir respectively for 5 min, 10 min and 20 min, and then centrifuge at a speed of 4000 rpm. The separated dye solution is measured by a UV-visible spectrophotometer. The absorbance within the visible light wavelength range of 400nm-780nm, and then calculate the area contained in the absorbance spectrum by the integral method, and the areas are 121.4412, 85.5467 and 54.9943 respectively; that is, the decolorization rates are 44....

Embodiment 3

[0052] Embodiment 3 cationic dyes

[0053] Use unpurified cationic blue, cationic red and cationic yellow, these three kinds of cationic dyes, use the same weight of each dye to prepare a mixed dye solution with a concentration of 100mg / L, and measure the concentration at 400nm-780nm by an ultraviolet-visible spectrophotometer. The absorbance in the visible light wavelength range, and then calculate the area contained in the absorbance spectrum by the integral method, and the area is 459.0366.

[0054] Add 0.2g of activated carbon to 100ml of the above-mentioned mixed dye solution with a concentration of 100mg / L, stir for 5min, 10min and 20min respectively, and then centrifuge at a speed of 4000rpm. The separated dye solution is measured by a UV-visible spectrophotometer Absorbance in the visible light wavelength range of 400nm-780nm, and then calculate the area contained in the absorbance spectrum by the integral method, and the areas are 214.7890, 186.0732 and 178.4425 respe...

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Abstract

The invention discloses a method for measuring the decolourization ratio of a colored substance in a solution. The method comprises the following steps of A, measuring the absorbency of the colored substance solution before decolourization to integrally calculate a spectrum area; B, measuring the absorbency of the colored substance solution after the decolourization to integrally calculate a spectrum area; C, calculating the decolourization ratio; D, detecting the accuracy. According to the method, the decolourization ratio is calculated according to the absorbency spectrum areas; an ultraviolet-visible spectrophotometer is used for measuring the absorbency of the colored substance before the decolourization within a visible light wavelength range of 400-780nm and integrally calculating the absorbency spectrum area; the ultraviolet-visible spectrophotometer is used for measuring the absorbency of the colored substance after the decolourization within the visible light wavelength range of 400-780nm and integrally calculating the absorbency spectrum area; the decolourization ratio of the colored substance can be calculated according to the absorbency spectrum areas. The calculating method has the advantages of simplicity in operation and accuracy in measurement.

Description

technical field [0001] The invention belongs to the field of decolorization rate detection, in particular to a method for measuring the decolorization rate of colored substances in a solution. Background technique [0002] In terms of water treatment, the decolorization rate of colored substances in water is one of the indicators for evaluating the effect of water quality treatment. Colored substances in water are not a single substance, but usually composed of different colored substances. Existing detection of the decolorization rate of colored substances in treated water is usually by visual colorimetry or ultraviolet-visible spectrophotometry. The disadvantage of the former is that it is highly subjective, especially when the color of the water is orange, the error in judging the decolorization rate by colorimetry is relatively large. The latter is calculated based on the change ratio of the absorbance of the colored substance at the maximum absorption wavelength befor...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 蔡映杰林丽娜
Owner WUHAN TEXTILE UNIV
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