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A method for measuring melamine based on methylene blue

A technology of melamine and methyl blue, applied in the measurement of color/spectral characteristics, etc., can solve problems such as harmfulness to the body, and achieve the effect of cheap instruments and easy operation.

Active Publication Date: 2020-07-31
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Melamine (Melamine, MEL) is an important chemical raw material, which can be used in the production of textile auxiliaries, leather emollients, glazing agents, water-resistant agents, adhesives, etc., but it is harmful to the body and cannot be added as a food additive. into food
This method has not been reported in the literature

Method used

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  • A method for measuring melamine based on methylene blue
  • A method for measuring melamine based on methylene blue

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Experimental program
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Embodiment

[0012] (1) Add 0.0, 0.02, 0.1, 0.3, 0.4, 0.5, 0.6mL of melamine solution with a concentration of 50mg / L to seven 10mL colorimetric tubes, and then add 1.0mL pH3. 4 HCl solution and 1.0mL methylene blue solution with a concentration of 0.5g / L, the solution without melamine was used as the reagent blank, and then the 7 colorimetric tubes were fixed to the mark with ultrapure water, shaken well, and After reacting in a water bath at ℃ for 20 minutes, use a 1cm cuvette on a spectrophotometer to measure the absorbance A of the blank solution without melamine at a wavelength of 598nm. 0 and the absorbance A of the melamine solution, calculate the difference in absorbance

[0013] ΔA=A 0 -A. The absorbance difference ΔA is linearly related to the mass concentration ρ of melamine in the range of 0.10 to 3.0 mg / L, and the linear regression equation is: ΔA=0.2423ρ+0.1019 (the unit of ρ is mg / L), and the correlation coefficient is 0.9981. The limit is 0.0991mg / L.

[0014] (2) Take 1....

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Abstract

The invention discloses a method for measuring melamine on the basis of methyl blue. The method includes sequentially adding 0.0, 0.02, 0.1, 0.3, 0.4, 0.5 and 0.6 mL of 50 mg / L melamine solution into7 color comparison tubes with the volumes of 10 mL, adding HCl and the methyl blue into the color comparison tubes, using solution without the melamine as reagent blank, achieving constant volumes atscales, carrying out reaction, measuring the absorbance A0 of the reagent blank and the absorbance A of solution with the added melamine solution at 598 nm locations on spectrophotometers by the aid of 1 cm cuvettes, and computing absorbance difference values delta A=A0-A; adding trichloroacetic acid and acetonitrile into an appropriate quantity of pure milk, carrying out ultrasonic treatment, centrifuging partial solution for 10 minutes, filtering supernatant by the aid of filter membranes and collecting filter liquid to be used as to-be-measured liquid; measuring absorbance values of 0.05 mLof to-be-measured liquid according to previous processes and computing the content of the melamine in the milk. The method has the advantages of simplicity and convenience in operation and inexpensive instruments.

Description

technical field [0001] The invention relates to a method for determining melamine, in particular to a method for determining melamine by spectrophotometry based on methylene blue. Background technique [0002] Melamine (Melamine, MEL) is an important chemical raw material, which can be used in the production of textile auxiliaries, leather emollients, glazing agents, water-resistant agents, adhesives, etc., but it is harmful to the body and cannot be added as a food additive. into the food. The methods reported in the literature for the determination of melamine mainly include chromatography, electrochemical methods, fluorescence spectroscopy, and spectrophotometry. Spectrophotometry has been widely used in the analysis of inorganic and organic substances due to its simple equipment and easy operation, but there are few reports on the determination of melamine. Methylene blue (MB) is an aromatic heterocyclic compound. In acidic solution, the sulfonic acid group contained i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 唐宁莉马小龙王文平梁文汇苏翥
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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