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Method for visually and rapidly detecting organophosphorus pesticide residues through quantum dot fluorescent probe

A technology of organophosphorus pesticides and fluorescent probes, applied in fluorescence/phosphorescence, chemical instruments and methods, measuring devices, etc., can solve problems such as unsuitable detection, secondary pollution of the environment and agricultural products, and high toxicity of cadmium-based quantum dots

Pending Publication Date: 2021-10-26
BEIJING UNIV OF AGRI
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Problems solved by technology

However, cadmium-based quantum dots are highly toxic and are not suitable for the detection of actual agricultural products such as fruits and vegetables, which may lead to secondary pollution of the environment and agricultural products

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  • Method for visually and rapidly detecting organophosphorus pesticide residues through quantum dot fluorescent probe
  • Method for visually and rapidly detecting organophosphorus pesticide residues through quantum dot fluorescent probe
  • Method for visually and rapidly detecting organophosphorus pesticide residues through quantum dot fluorescent probe

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Embodiment Construction

[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art know that the present invention is not limited to the drawings and the following embodiments.

[0044] An embodiment of the present invention provides a method for visually and rapidly detecting organophosphorus pesticide residues with a quantum dot fluorescent probe, the method comprising the following steps:

[0045] 1. Preparation of CdTe@ZnS nanocomposites

[0046] (1) Preparation of CdTe quantum dots

[0047] Add 0.114g CdCl to the 100mL three-necked flask 2 2.5H 2 O (0.5mmol) and 50mL deoxygenated ultrapure water, using N 2 For protection, 66 μL of thioglycolic acid (Mercapto acetic acid, MAA) was added dropwise under vigorous magnetic stirring. The pH of the mixture was then adj...

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Abstract

The invention relates to a preparation method of a quantum dot fluorescent probe capable of detecting organophosphorus pesticide residues. The method comprises the following steps: 1) preparing a CdTe quantum dot aqueous solution; 2) preparing a CdTe@ZnS composite nano material; and 3) preparation of the quantum dot fluorescent probe capable of detecting organophosphorus pesticide residues. The quantum dot dithizone system is prepared by utilizing a fluorescence resonance transfer principle, and the thiophosphate type organophosphorus pesticide is rapidly detected. The process from quantum dot fluorescence closing to quantum dot fluorescence opening is obvious, visible visual detection can be achieved under ultraviolet light, and therefore qualitative detection is achieved. The fluorescence intensity of the quantum dots and the pesticide concentration are in a certain linear relationship, so that quantitative detection is realized.

Description

technical field [0001] The invention relates to an analysis and detection method of trace amount of agricultural chemicals, in particular to a method for rapidly detecting residues of phosphorothioate type organophosphorus pesticides in a visualized and visualized nanocomposite fluorescent on-off mode. Background technique [0002] Organophosphorus pesticides refer to organic compound pesticides containing phosphorus, which are mainly used to prevent and control plant diseases, insects, and weeds. Organophosphorus pesticides (Organophosphorus Pesticides, OPs) have the advantages of broad-spectrum, low drug resistance, and low cost, and their usage accounts for as high as 70% of all pesticides in my country. Organophosphorus pesticides are widely used in agricultural production. In China, only about 10% of organophosphorus pesticides sprayed on crops will act on crops, about 5% will affect harmful insects and weeds, and the rest will stay in the surrounding environment, incl...

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Application Information

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IPC IPC(8): G01N21/64C02F1/48
CPCG01N21/643G01N21/6447C02F1/481G01N2021/6432
Inventor 曲江兰郭延雪刘佳玟张伟宋潇艺许浩铭
Owner BEIJING UNIV OF AGRI
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