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Preparation method of electrochemical sensor for detecting organophosphorus pesticide methyl parathion

A technology of methyl parathion and organophosphorus pesticides, applied in the direction of material electrochemical variables, etc., can solve the problems of unstable life of enzyme sensors, enzyme variability, etc., and achieve low preparation cost, good stability, and strong selectivity Effect

Inactive Publication Date: 2013-07-10
JIANGXI SCI & TECH NORMAL UNIV
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Problems solved by technology

However, the variability of enzymes makes enzyme sensors unstable and short-lived, thus limiting the application of enzyme electrochemical sensors.

Method used

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  • Preparation method of electrochemical sensor for detecting organophosphorus pesticide methyl parathion
  • Preparation method of electrochemical sensor for detecting organophosphorus pesticide methyl parathion
  • Preparation method of electrochemical sensor for detecting organophosphorus pesticide methyl parathion

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Embodiment Construction

[0010] A method for preparing an electrochemical sensor for detecting the organophosphorus pesticide methyl parathion, comprising the following steps:

[0011] 1. Preparation of a mixture of single-walled carbon nanotubes (?-SWCNT) and β-cyclodextrin (β-CD): Dilute 1.0 wt% ?-SWCN with secondary water and sonicate for 1 hour to obtain 0.1 wt% ?-SWCN dispersion, doped β-CD into 0.1 wt% ?-SWCN dispersion so that the concentration of β-CD was 10 mg mL -1 , ultrasonically mixed to obtain ?-SWCNT–β-CD mixture.

[0012] Electrochemical determination of methyl parathion: different concentrations of methyl parathion were added to phosphate buffer at pH 6.0, and methyl parathion was subjected to differential pulse voltammetry using a ?-SWCNT–β-CD composite electrode Determination. The results show that the composite electrode has a good linear relationship to methyl parathion, remarkable sensitivity and low detection limit.

[0013] Performance evaluation of the ?-SWCNT–β-CD composit...

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Abstract

The invention relates to a preparation method of an electrochemical sensor for detecting organophosphorus pesticide methyl parathion. 0.1wt% functionalized single-walled carbon nanotubes and 10mgml-1beta-cyclodextrin are taken as materials, directly dropped and coated on the surface of a glassy carbon electrode after being evenly mixed by ultrasonic, and then dried by using an infrared drying oven to prepare an electrochemical sensing composite electrode with good electrochemical properties and selectivity. The composite electrode constructed by the preparation method has good electrocatalytical properties on the methyl parathion, has the characteristics of fast current response, wide linear range, high sensitivity, low detection limit, good stability and the like, and has the advantages of low preparation cost, simple process, simpleness and easiness in operation, strong selectivity and the like. The prepared composite electrode is successfully applied in the analysis and the detection on methyl parathion residues in vegetables such as onion, lettuce, spinach and cole, and has a good application prospect and a potential application value in the field of detection and analysis on environmental pollution.

Description

technical field [0001] The invention belongs to the field of electrochemical sensors, and relates to a method for preparing an electrochemical sensor for detecting organophosphorus pesticide methyl parathion. Background technique [0002] Methyl Parathion, or O, O-dimethyl-O-(4-nitrophenyl) phosphorothioate, commonly known as methyl 1605, is a broad-spectrum, highly effective organophosphorus Insecticides are highly toxic pesticides. It was synthesized by G. Schrader of Farben, Germany in 1944 and put into production in 1949, and then many countries began to produce it. Industrial grade methyl parathion is yellow or brown oily liquid with garlic odor. The pure product is White crystal, melting point 36-36.5 ℃, hardly soluble in water, easily soluble in organic solvents. Methyl parathion is relatively stable in neutral and weakly acidic medium, it will be isomerized when heated, and it is easy to decompose at high temperature or in case of alkali. Methyl parathion degrades...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 徐景坤姚媛媛文阳平张革张龙祝丹华夏红英赵丰
Owner JIANGXI SCI & TECH NORMAL UNIV
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