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Poly-3-methyl thiophene-N-doped graphene (P3MT/N-GE) modified glassy carbon electrode and application thereof to detecting pesticide phoxim

A technology of glassy carbon electrode and modified electrode, which is applied in the field of electrochemical analysis and detection, can solve the problems of complicated operation and high cost, and achieve the effects of simple operation, low detection limit and low preparation cost

Active Publication Date: 2013-12-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have disadvantages such as high cost and complicated operation.
Therefore, it is necessary and challenging to develop a fast, simple and sensitive method for the detection of imidacloprid

Method used

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  • Poly-3-methyl thiophene-N-doped graphene (P3MT/N-GE) modified glassy carbon electrode and application thereof to detecting pesticide phoxim
  • Poly-3-methyl thiophene-N-doped graphene (P3MT/N-GE) modified glassy carbon electrode and application thereof to detecting pesticide phoxim
  • Poly-3-methyl thiophene-N-doped graphene (P3MT/N-GE) modified glassy carbon electrode and application thereof to detecting pesticide phoxim

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Effect test

Embodiment 1

[0027] A kind of P3MT / N-GE modified glassy carbon electrode, described electrode is prepared by the following steps:

[0028] (1) Preparation of N-GE modified electrode: A certain amount of nitrogen-doped graphene was diluted with N,N-dimethylformamide and then ultrasonically dispersed to prepare a 1 mg / mL N-GE dispersion. Take 10 μL of N-GE dispersion and apply it on the surface of the polished glassy carbon electrode. After the solvent evaporates, a nitrogen-doped graphene-modified glassy carbon electrode with a sensitive film is obtained;

[0029] (2) Preparation of poly-3-methylthiophene / nitrogen-doped graphene-modified glassy carbon electrode (P3MT / N-GE): 10 μL of pure 3-methylthiophene monomer was added dropwise to 10 ml of acetonitrile solution, and then sonicated for half an hour to obtain a mixed solution containing 3-methylthiophene monomer. The N-GE modified glassy carbon electrode prepared in step (1) was placed in the mixed solution, and the potential range was 0...

Embodiment 2

[0031] A kind of P3MT / N-GE modified glassy carbon electrode, described electrode is prepared by the following steps:

[0032] (1) Preparation of N-GE modified electrode: A certain amount of nitrogen-doped graphene was diluted with N,N-dimethylformamide and then ultrasonically dispersed to prepare a 5 mg / mL N-GE dispersion. Take 2 μL of N-GE dispersion and apply it on the surface of the polished glassy carbon electrode. After the solvent evaporates, a nitrogen-doped graphene-modified glassy carbon electrode with a sensitive film is obtained;

[0033] (2) Preparation of poly-3-methylthiophene / nitrogen-doped graphene-modified glassy carbon electrode (P3MT / N-GE): 15 μL of pure 3-methylthiophene monomer was added dropwise to 10 ml of acetonitrile solution, and then sonicated for half an hour to obtain a mixed solution containing 3-methylthiophene monomer. The N-GE modified glassy carbon electrode prepared in step (1) was placed in the mixed solution, and the potential range was 0....

Embodiment 3

[0035] A kind of P3MT / N-GE modified glassy carbon electrode, described electrode is prepared by the following steps:

[0036] (1) Preparation of N-GE modified electrode: A certain amount of nitrogen-doped graphene was diluted with N,N-dimethylformamide and then ultrasonically dispersed to prepare a 0.5 mg / mL N-GE dispersion. Take 10 μL of N-GE dispersion and apply it on the surface of the polished glassy carbon electrode. After the solvent evaporates, a nitrogen-doped graphene-modified glassy carbon electrode with a sensitive film is obtained;

[0037] (2) Preparation of poly-3-methylthiophene / nitrogen-doped graphene-modified glassy carbon electrode (P3MT / N-GE): 20 μL of pure 3-methylthiophene monomer was added dropwise to 10 ml of acetonitrile solution, and then sonicated for half an hour to obtain a mixed solution containing 3-methylthiophene monomer. The N-GE modified glassy carbon electrode prepared in step (1) was placed in the mixed solution, and the potential range was...

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Abstract

The invention discloses a poly-3-methyl thiophene-N-doped graphene (P3MT / N-GE) modified glassy carbon electrode and application of the P3MT / N-GE modified glassy carbon electrode to detecting a pesticide phoxim. The P3MT / N-GE modified glassy carbon electrode disclosed by the invention is obtained by the following steps: ultrasonically dispersing N-doped graphene in an N,N-dimethylformamide solution; then dripping a dispersion solution on a glassy carbon electrode; evaporating a solvent to obtain an N-doped graphene modified electrode constructed by a sensitive film and the glassy carbon electrode; preparing the poly-3-methyl thiophene-N-doped graphene (P3MT / N-GE) modified glassy carbon electrode in an acetonitrile solution containing a 3-methyl thiophene-graphene monomer and lithium perchlorate by electrochemical polymerization. The modified carbon electrode is simple in preparation operation, environment-friendly, and low in cost; the modified carbon electrode can be used for detecting the pesticide phoxim and has the characteristics of high sensitivity, wide linear range, good repeatability, high stability and the like; the lowest detection limit reaches 0.002 micromole / liter.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a P3MT / N-GE modified glassy carbon electrode and its application in the detection of pesticide phoxim. Background technique [0002] Phoxim is a broad-spectrum organophosphorus insecticide with strong knockdown power, mainly contact and stomach toxicity, and has no systemic effect. Its development and use have greatly increased the yield of crops, but with its unreasonable use, it has led to excessive residues in many agricultural products such as grains, fruits and vegetables, and seriously threatened human health. At present, methods for the determination of phoxim residues include gas chromatography, liquid chromatography, fluorescence photometry, polarography, thin-layer chromatography, electrochemical methods, plant esterase methods, and enzyme inhibition methods. However, these methods have disadvantages such as high cost an...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48C04B41/52
Inventor 雷武韩振郝青丽夏明珠王风云
Owner NANJING UNIV OF SCI & TECH
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