Methyl viologen visual detection method based on cadmium telluride quantum-dot/filter paper compound

A technology of cadmium telluride quantum dots and methyl viologen, which is applied in the directions of fluorescence/phosphorescence, material excitation analysis, etc., can solve problems such as poisoning, residual pulmonary fibrosis, etc., and achieves a simple preparation method, low cost, and low dosage. Effect

Inactive Publication Date: 2014-12-24
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Methyl viologen is rapidly absorbed orally, and there is no specific antidote. It is very toxic to the heart, lungs and brain. The poisoning mortality rate is as high as 60-80%. Survivors often have severe pulmonary fibrosis

Method used

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  • Methyl viologen visual detection method based on cadmium telluride quantum-dot/filter paper compound
  • Methyl viologen visual detection method based on cadmium telluride quantum-dot/filter paper compound

Examples

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Effect test

Embodiment 1

[0029] Mix 3.6 mL of 4mM cadmium telluride quantum dot solution with 0.4 mL of glycerol to prepare a mixed solution of cadmium telluride quantum dots-glycerol. Cut into 0.5×7 cm 2 10 pieces of filter paper were soaked in the mixed solution for one day, and then the excess glycerin and cadmium telluride quantum dots were absorbed by the filter paper, and the cadmium telluride filter paper composite substrate was prepared for use. Then when detecting methyl viologen, cut the prepared filter paper base into 0.25×0.25cm 2 of blocks. When detecting methyl viologen, 0.5 μL of different concentrations of methyl viologen was added dropwise to the center of the square filter paper, and the brightness of the center of the square cadmium telluride composite filter paper was analyzed with a fluorescence microscope to obtain a standard curve ( figure 1 ).

[0030] According to the equation Q = (F 0 -F) / F 0 , Q represents the quenching efficiency, F 0 Represents the brightness of the...

Embodiment 2

[0032] Mix 2.4 mL of 4 mM CdTe quantum dot solution with 1.6 mL of glycerol. Cut into 0.5×7 cm 2 10 pieces of filter paper were soaked in it for one day, and then the excess glycerin and cadmium telluride quantum dots were absorbed by the filter paper, and the cadmium telluride filter paper composite substrate was prepared for use. Then when detecting methyl viologen, cut the prepared filter paper base into 0.25×0.25cm 2 of blocks. When detecting methyl viologen, 0.5 μL of different concentrations of methyl viologen was added dropwise to the center of the square filter paper, and the brightness of the center of the square cadmium telluride composite filter paper was analyzed with a fluorescence microscope to obtain a standard curve ( figure 2 ).

[0033] Add methyl viologen of unknown concentration to be detected dropwise on the cadmium telluride quantum dot / filter paper composite, use imageJ to analyze the center of methyl viologen dropwise, and according to the formula ...

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Abstract

The invention discloses a methyl viologen visual detection method based on a cadmium telluride quantum-dot / filter paper compound. The method comprises the steps of uniformly mixing cadmium telluride quantum-dot solution and glycerol; immersing filter paper strips into the solution and taking the filter paper strips out; absorbing away superfluous glycerol and superfluous cadmium telluride quantum dots on the cadmium telluride / filter paper compound with clean filter paper, drying the cadmium telluride / filter paper compound and cutting the cadmium telluride / filter paper compound into square pieces for standby; adding methyl viologen drops of different concentrations onto the centers of the square filter paper pieces, performing brightness analysis on the centers of the square cadmium telluride / filter paper compound pieces, according to an equation of Q=(F0-F) / F0, obtaining a standard curve; adding methyl viologen drops to be detected onto the cadmium telluride quantum-dot / filter paper compound, analyzing the center of the cadmium telluride quantum-dot / filter paper compound with the methyl viologen drops through imageJ software and performing concentration, and finding the corresponding concentration from the standard curve. The methyl viologen visual detection method based on the cadmium telluride quantum-dot / filter paper compound is simple and easy to implement, applicable to popularization and application; sensors manufactured according to the method is high in selectivity and stability.

Description

technical field [0001] The invention belongs to the technical field of pesticide detection and relates to a visual detection method of methyl viologen (paraquat) based on cadmium telluride quantum dot / filter paper composite. Background technique [0002] Methyl viologen, also known as paraquat, is a highly efficient, rapid and non-selective bispyridine herbicide, which is widely used in about 130 countries around the world. Oral absorption of methyl viologen is rapid, and there is no specific antidote. It is very toxic to the heart, lungs and brain. The death rate of poisoning is as high as 60-80%. Survivors often suffer from severe pulmonary fibrosis. Therefore, the detection of methyl viologen is an effective way to prevent methyl viologen poisoning. [0003] Filter paper has attracted widespread attention due to its advantages of low price, light weight, easy portability and renewability. The three-dimensional network structure of filter paper is easy to modify, so it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 韩晓军苏迎春
Owner HARBIN INST OF TECH
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