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Enzyme-free methyl parathion detection sensor, and preparation and application methods thereof

A methyl parathion and detection sensor technology, applied in the direction of material electrochemical variables, can solve the problems of expensive, complex sample processing, unfavorable parathion detection, etc., and achieve simple operation, good detection signal reproducibility, and electro The effect of outstanding chemical properties

Inactive Publication Date: 2012-08-15
HUNAN UNIV
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Problems solved by technology

At present, the analysis methods for detecting organophosphorus pesticides mainly include gas chromatography, liquid chromatography, enzyme inhibition method, immunoassay, etc., but these methods require expensive equipment, complicated sample processing, time-consuming, and are not cost-effective. Conducive to the realization of simple and rapid detection of parathion-methyl

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  • Enzyme-free methyl parathion detection sensor, and preparation and application methods thereof
  • Enzyme-free methyl parathion detection sensor, and preparation and application methods thereof
  • Enzyme-free methyl parathion detection sensor, and preparation and application methods thereof

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the examples, rather than limiting the present invention.

[0034] By using the method of the present invention, the inventors realized the simple, rapid and highly sensitive detection of methyl parathion in a certain soil in the Xiangjiang River.

[0035] 1. Extraction of methyl parathion in soil: Mix 1 g of soil from somewhere in the Xiangjiang River with 5 mL of n-hexane under ultrasonic conditions for 2.5 hours; use 80kDa dialysis membrane to filter, remove the precipitate, and use N 2 Blow dry with air until the remaining n-hexane content in the filtrate is 0.1mL-0.5mL, and obtain a concentrated sample for testing.

[0036] 2. Detection of methyl parathion in soil:

[0037] After 5mg of graphite oxide and 5mg of carbon nanotubes were mixed evenly, they were added to 10mL of 0.2wt% chitosan solution; ultrasonic oscillation was performed for 3 hours to obtain a graphene oxide-carbon nanotube-c...

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Abstract

The invention discloses an enzyme-free methyl parathion detection sensor, and preparation and application methods thereof. The sensor comprises a three-electrode system, wherein a graphene / carbon nanotube / chitosan deposition modified glassy carbon electrode is used as a working electrode, a platinum sheet is used as a counter electrode, and a calomel electrode is used as a reference electrode. In the detection process, by using the graphene / carbon nanotube / chitosan deposition modified glassy carbon electrode as the working electrode, the platinum sheet as the counter electrode and the calomel electrode as the reference electrode, an electrochemical work station is utilized to determine the content of methyl parathion. The enzyme-free methyl parathion detection sensor disclosed by the invention has the advantages of short preparation time and environment friendliness, is simple to operate, and can be recycled; and the low detection limit is 0.8ng / L. The invention also has the advantages of short sample detection time and simple treatment.

Description

Technical field: [0001] The invention relates to a simple, fast and environment-friendly enzyme-free methyl parathion detection sensor and a preparation method and application method thereof by one-step electrodeposition. Background technique: [0002] Organophosphorus pesticides have the advantages of high efficacy, less dosage, many control objects, and easy decomposition in nature, so they are widely used in agricultural production in our country. Among them, methyl parathion (MP), as a broad-spectrum and high-efficiency organophosphorus insecticide and acaricide, has been widely used worldwide for pest control of agricultural crops such as grain and cotton. However, methyl parathion is highly toxic to humans and animals, and can enter the animal body through the esophagus, respiratory tract and skin to cause poisoning. Although its production and use have been banned in my country at present, reports of methyl parathion poisoning incidents have occurred from time to tim...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 罗胜联杨善丽梁杰生刘承斌
Owner HUNAN UNIV
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