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Method for rapidly and sensitively detecting organophosphorus pesticide chlorpyrifos

A sensitive detection technology for organophosphorus pesticides, applied in the field of electrochemical detection, can solve the problems of expensive test environment, food safety, long analysis cycle, etc., achieve excellent photoelectrochemical performance and biocompatibility, short detection time, high sensitivity high effect

Inactive Publication Date: 2014-03-12
JIANGSU UNIV
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Problems solved by technology

Driven by agricultural science and technology, the variety and quantity of chemical pesticides have been increasing, and have become the main means of pest control. Although the extensive use of pesticides has effectively solved the problems of crop pests and diseases, many pesticides and their degradation products will remain. used in all kinds of food, ecological environment and drinking water, which also brings serious food safety and environmental pollution problems
Conventional pesticide residue detection techniques such as gas chromatography, high performance liquid chromatography, and color-mass spectrometry have been applied in the actual work of pesticide residue detection, but due to their high technical content (requires professional personnel to operate), long analysis period, The equipment is expensive and requires a special test environment, so it is not easy to promote

Method used

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  • Method for rapidly and sensitively detecting organophosphorus pesticide chlorpyrifos

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Embodiment 1

[0025] Cd 0.5 Zn 0.5 Preparation of S-rGO nanocomposites:

[0026] Weigh 17 mg GO and add it into a round bottom flask containing 50 mL double-distilled water, ultrasonically disperse, so that GO is exfoliated into a single layer of graphene oxide, and a homogeneous brown suspension is obtained after 30 minutes; Slowly add 238 mg 0.02 MCd(NO 3 ) 2 and 297 mg 0.02 M Zn(NO 3 ) 2 solution and stirred at room temperature for 3 hours; then into the flask into H 2S gas for 1 hour until a yellow-green precipitate is produced, and the obtained precipitate is centrifuged, washed with twice distilled water and acetone for 3 times, and finally vacuum-dried at 45 °C for 24 hours to obtain Cd 0.5 Zn 0.5 S-rGO nanocomposite.

[0027] Modification of the photoelectrochemical sensing interface:

[0028] Take 1 mg Cd 0.5 Zn 0.5 S-rGO nanocomposites were ultrasonically dispersed in secondary water to form 2 mgmL ?1 suspension, the 6 mu L The suspension is drop-coated o...

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Abstract

The invention relates to a method for rapidly and sensitively detecting organophosphorus pesticide chlorpyrifos and belongs to the technical field of electrochemical detection. The method comprises the following steps: firstly, preparing a Cd0.5Zn0.5S-rGO nano composite in situ with graphite oxide, Cd(NO3)2 and Zn(NO3)2 as starting raw materials and H2S gas a sulfur source and a reducing agent; then, sequentially modifying Cd0.5Zn0.5S-rGO and acetylcholin esterase on the surface of a glassy carbon electrode by dispensing and physical absorption; and finally, constructing a photoelectrochemical sensing interface based on the good photoelectrochemical performance and the biocompatibility of the Cd0.5Zn0.5S-rGO and applying the photoelectrochemical sensing interface to rapid and sensitive detection of the organophosphorus pesticide. According to a photoelectrochemical and enzyme sensing coupling technology provided by the invention, the sensitive detection of the chlorpyrifos is realized successively; the method needs few samples, has short detection time and high sensitivity and is suitable for detection analysis of pesticide residues in agricultural products.

Description

technical field [0001] Based on photoelectrochemical-enzyme sensing coupling technology, the invention relates to a method for rapidly and sensitively detecting organophosphorus pesticide residues in agricultural products, belonging to the technical field of electrochemical detection. [0002] Background technique [0003] With the progress of society and the continuous improvement of people's living standards, food safety and human health have become one of the hot topics of global concern. Driven by agricultural science and technology, the variety and quantity of chemical pesticides have been increasing, and have become the main means of pest control. Although the extensive use of pesticides has effectively solved the problems of crop pests and diseases, many pesticides and their degradation products will remain. In all kinds of food, ecological environment and drinking water, it also brings serious food safety and environmental pollution problems. Conventional pesticide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
Inventor 刘倩王坤蔡健荣邱白晶还娟严玉婷严佳佳
Owner JIANGSU UNIV
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