Method for detecting organic phosphorus pesticides by utilizing fluorescence intensity of CdTe quantum dot

A technology of organophosphorus pesticides and fluorescence intensity, 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 rapid detection and convenient supervision

Inactive Publication Date: 2014-05-07
JILIN UNIV
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Problems solved by technology

Although these methods have high sensitivity, these methods require expensive equipment, long measurement time, h...

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  • Method for detecting organic phosphorus pesticides by utilizing fluorescence intensity of CdTe quantum dot
  • Method for detecting organic phosphorus pesticides by utilizing fluorescence intensity of CdTe quantum dot
  • Method for detecting organic phosphorus pesticides by utilizing fluorescence intensity of CdTe quantum dot

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Embodiment Construction

[0031] Synthesis and Purification of CdTe Quantum Dots

[0032] Materials / Reagents: Te powder, NaBH4 and TGA were purchased from Sinopharm Reagent

[0033] Method: First weigh 0.0256g Te powder and 0.0386g NaBH4 into a three-necked flask, prepare 100mL of NaOH solution with pH=11 with high-purity water, pass N2 into it for 10min, put it in a constant pressure titration funnel ①, and prepare with high-purity water Add 67 μL TGA to 100 mL of CdCl2 solution with a concentration of 4×10-3 mol / L, adjust the pH to 11 with 1 mol / L NaOH solution, inject N2 into it for 10 min, and put the obtained clear and transparent solution in another constant pressure titration In the funnel ②, connect the whole device with the vacuum and N2 system, and go through several steps of vacuuming and N2 to remove the O2 in the system; heat slightly, open the funnel ①, add 3 to 5 drops of water, and stir it electromagnetically to initiate the reaction. After the Te powder basically reacts completely (th...

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Abstract

A method for detecting organic phosphorus pesticides by utilizing the fluorescence intensity of a CdTe quantum dot belongs to the technical field of analytical chemistry, and is characterized in that the amount of the residual organic phosphorus pesticides in vegetables is detected by using the fluorescence enhancement effect of the CdTe quantum dot and a colorimetric method for enzyme inhibition, and the detection method comprises the following steps: synthesizing and purifying a cadmium telluride quantum dot aqueous solution; observing a CdTe system containing methamidophos with different concentrations by using a continuous colorimetric method, and detecting the organic phosphorus pesticides by utilizing the fluorescence enhancement effect of the CdTe quantum dot and the colorimetric method for the enzyme inhibition. The method can simply, quickly and sensitively detect the methamidophos in the organic phosphorus pesticides, has very high sensitivity, and brings convenience for the future research, production, supervision and management, and the like.

Description

technical field [0001] The invention discloses a method for rapidly detecting organophosphorus pesticides by utilizing the fluorescence intensity of CdTe quantum dots, 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 serine in the active c...

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Application Information

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IPC IPC(8): C12Q1/46G01N21/64
Inventor 孙春燕罗叶丽郭佳佳张民伟曹先一李宏坤沈斐
Owner JILIN UNIV
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