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Method for rapidly detecting residual organophosphorus pesticide in vegetables by utilizing double-signal method of CdTe quantum dots and gold nanoparticles

A technology of gold nanoparticles and organophosphorus pesticides, applied in the field of analytical chemistry, can solve the problems of high cost, long measurement time, unsuitable for rapid detection, etc., and achieve the effect of convenient supervision

Inactive Publication Date: 2013-05-01
JILIN UNIV
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  • Application Information

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Problems solved by technology

Although these methods have high sensitivity, these methods require expensive equipment, long measurement time, high cost, professional and technical personnel are required to operate, and are not suitable for on-site rapid detection

Method used

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  • Method for rapidly detecting residual organophosphorus pesticide in vegetables by utilizing double-signal method of CdTe quantum dots and gold nanoparticles
  • Method for rapidly detecting residual organophosphorus pesticide in vegetables by utilizing double-signal method of CdTe quantum dots and gold nanoparticles
  • Method for rapidly detecting residual organophosphorus pesticide in vegetables by utilizing double-signal method of CdTe quantum dots and gold nanoparticles

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Embodiment Construction

[0035] Synthesis and Purification of CdTe Quantum Dots

[0036] Materials / Reagents: Te powder, NaBH 4and TGA purchased from Sinopharm Reagent

[0037] Method: First weigh 0.0256g Te powder and 0.0386gNaBH4 into a three-necked flask, prepare 100mL of NaOH solution with pH=11 with high-purity water, and pass into it for 10min with N 2 , installed in a constant pressure titration funnel ①, prepared with high-purity water to a concentration of 4×10 -3 mol / L CdCl2 solution 100mL, add 67μL TGA, use 1mol / L NaOH solution to adjust pH=11, pass 10min N into it 2 , put the obtained clear and transparent solution in another constant pressure titration funnel ②, connect the whole device with vacuum, N 2 The system is connected, and the O in the system is removed through several steps of vacuuming and N2 2 Slightly heat, open the funnel ①, add 3 to 5 drops of water, stir electromagnetically, and initiate the reaction. After the Te powder has basically reacted (the solution is red and th...

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Abstract

The invention relates to a method for rapidly detecting residual organophosphorus pesticide in vegetables by utilizing a double-signal method of CdTe quantum dots and gold nanoparticles (AuNPs), and belongs to the technical field of analytical chemistry. The technical scheme provided by the invention comprises the following detecting steps: synthesizing and purifying a CdTe quantum dot aqueous solution; preparing AuNPs; performing TEM (transmission electron microscope) characterization on AuNPs and a AuNPs-substrate-enzyme system respectively; studying a fluorescence spectrum and an absorption spectrum which are interactive between CdTe quantum dots and AuPNs; and utilizing the double-signal method of CdTe quantum dots and AuNPs to rapidly detect the organophosphorus pesticide. The method can detect methamidophos in the organophosphorus pesticide simply, rapidly and sensitively, has very high sensitivity and provides convenience for subsequent research, production, supervision and the like.

Description

technical field [0001] The invention discloses a method for rapidly detecting organophosphorus pesticides by using a dual-signal method of CdTe quantum dots and gold nanoparticles (AuNPs), belonging to the technical field of analytical chemistry. Background technique [0002] Organophosphorus pesticides are mainly used as agricultural insecticides, and a few varieties are used as fungicides, herbicides and defoliants. This type of pesticide has good insecticidal effect and short residual effect period, but it has certain toxicity to warm-blooded animals, and the toxicity is related to the chemical structure. Most belong to moderate toxicity and low toxicity, and a few belong to high toxicity. The general formula of organophosphorus pesticides is as follows: [0003] [0004] R in the above formula 1 and R 2 Most are methyl and ethyl, and X is an alkoxy, aryl, halogen or heterocyclic substituent. [0005] Organophosphorus pesticides can bind to the hydroxyl group on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 孙春燕郭佳佳李宏坤张民伟曹先一罗叶丽沈斐
Owner JILIN UNIV
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