Application of functionalized three-dimensional covalent organic framework in detection of organophosphorus pesticide residues

A technology of covalent organic framework and organophosphorus, applied in the field of detection, can solve the problems of lack of selectivity, high synthesis cost, high price and the like, and achieve the effects of simple operation, simple operation and good stability

Active Publication Date: 2022-07-01
JIANGNAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is to overcome the lack of selectivity, high price, long time-consuming, synthetic High cost and complicated process

Method used

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  • Application of functionalized three-dimensional covalent organic framework in detection of organophosphorus pesticide residues
  • Application of functionalized three-dimensional covalent organic framework in detection of organophosphorus pesticide residues
  • Application of functionalized three-dimensional covalent organic framework in detection of organophosphorus pesticide residues

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Embodiment 1

[0051] The application of a functionalized three-dimensional covalent organic framework in the detection of organophosphorus pesticide residues specifically includes the following steps:

[0052] Step1: Preparation of adsorbent 3DCOF-OH

[0053] refer to figure 1 As shown, TAM (0.09 mmol, 34.2 mg) and DHNDA (0.18 mmol, 38.9 mg) were weighed and mixed with 12 M acetic acid (0.9 mL) and 1,4-dioxane (0.1 mL) in a 35 mL pressure-resistant tube (OD 26×L 125mm). After the mixture was sonicated for 15 min, it was degassed with 3 freeze pump-thaw cycles, then reacted at 120 °C for 3 d, the precipitate was collected by centrifugation, and washed twice with tetrahydrofuran and deionized water, respectively. Finally, the precipitate was dried under vacuum at 70 °C for 24 h to obtain a red powder with a yield of 75%, namely 3DCOF-OH.

[0054] Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy tests or characterizat...

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Abstract

The invention relates to application of a functionalized three-dimensional covalent organic framework in detection of organophosphorus pesticide residues, and relates to the technical field of detection. The detection method comprises the following steps: using a hydroxyl-functionalized three-dimensional covalent organic framework material as an adsorbent for distributed solid-phase extraction of trace organophosphorus in fruits and vegetables, and detecting and analyzing organophosphorus in fruits and vegetables by gas chromatography. The detection method disclosed by the invention is simple to operate, low in material consumption and low in cost; only a small amount of organic solvent is used as an analyte extraction solvent, so that the method has the advantages of environmental protection and economy; the sensitivity is high, the detection limit is 0.15-0.39 ng / mL, and the linear relation between the organic phosphorus peak area and the concentration is good.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to the application of a functionalized three-dimensional covalent organic framework in the detection of organophosphorus pesticide residues. Background technique [0002] The use of organophosphorus pesticides is an indispensable link in the agricultural production process. Although this pesticide has greatly increased the yield of crops, its widespread use has resulted in serious residues in soil, water and food, increasing the potential threat to ecosystems and human health, thus drawing people's attention to its harm. Many regions have strict regulations on organophosphorus pesticides to ensure food safety. Therefore, the analysis and detection of organophosphorus is of crucial significance. [0003] Chromatography is the most important method for the detection of pesticide residues, including high performance liquid chromatography, gas chromatography, liquid chromatography, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8634Y02P20/54
Inventor 钱海龙杜美兰严秀平
Owner JIANGNAN UNIV
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