Organic nitrogen and sulfur pesticide detection method

A detection method, organic nitrogen technology, applied in the field of pesticide detection, can solve the problem of rare sensor colorimetric cards, and achieve the effect of low cost, easy operation and good stability

Active Publication Date: 2019-05-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently available color comparison cards for pesticide residue detection on the market are mainly based on enzyme inhibition and immunoassay methods, and generally only for the determination of organophosphorus and carbamate pesticides. Sensing color cards for nitrogen and sulfur pesticides are still rare in the market

Method used

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  • Organic nitrogen and sulfur pesticide detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 91.09mg of cetyltrimethylammonium bromide and 170mg of copper chloride dihydrate into a reaction flask, add 8ml of deionized water, stir to dissolve, and slowly add 2ml of aqueous solution in which 9.5mg of sodium borohydride is dissolved while stirring , continue to stir the reaction after the dropwise addition. The stirring speed is 1000rpm, the reaction time is 2h, and the reaction temperature is 25°C. After the reaction was completed, the supernatant was removed by centrifugation, and the obtained solid was resuspended and washed with 8 ml of deionized water, and the precipitate was obtained by centrifugation at a speed of 6000 g for 20 minutes. Washing with water was repeated three times and then vacuum-dried to obtain a solid product of fluorescent copper nanosheets. The fluorescent copper nanosheet structure characterized by electron microscopy, such as figure 1 , it can be clearly observed that the product has a sheet-like structure. The obtained coppe...

Embodiment 2

[0039] Weigh 91.09mg of hexadecyltrimethylammonium bromide and 85mg of copper chloride dihydrate into the reaction flask, add 8ml of deionized water, stir to dissolve, slowly add 2ml of aqueous solution in which 9.5mg of sodium borohydride is dissolved while stirring , continue to stir the reaction after the dropwise addition. The stirring speed is 1000rpm, the reaction time is 2h, and the reaction temperature is 25°C. After the reaction was completed, the supernatant was removed by centrifugation, and the obtained solid was resuspended and washed with 8 ml of deionized water, and the precipitate was obtained by centrifugation at a speed of 6000 g for 20 minutes. Washing with water was repeated three times and then vacuum-dried to obtain a solid product of fluorescent copper nanosheets. The obtained copper nanosheets emit orange fluorescence under 254nm light excitation.

[0040] Design the required circular sample point and the size of the square outside the sample point th...

Embodiment 3

[0043] Weigh 364.3mg of cetyltrimethylammonium bromide and 42.5mg of copper chloride dihydrate in a reaction flask, add 8ml of deionized water, stir to dissolve, and slowly add 2ml of dissolved 9.5mg of sodium borohydride dropwise while stirring Aqueous solution, continue to stir the reaction after the dropwise addition. The stirring speed is 1000rpm, the reaction time is 2h, and the reaction temperature is 25°C. After the reaction was completed, the supernatant was removed by centrifugation, and the obtained solid was resuspended and washed with 8 ml of deionized water, and the precipitate was obtained by centrifugation at a speed of 6000 g for 20 minutes. Washing with water was repeated three times and then vacuum-dried to obtain a solid product of fluorescent copper nanosheets. The fluorescent copper nanosheet structure characterized by electron microscopy, such as Figure 7 , it can be clearly observed that the product has a sheet-like structure. The obtained copper nan...

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Abstract

The invention relates to an organic nitrogen and sulfur pesticide detection method. The method comprises the steps that a fluorescent copper nanosheet material is prepared through a chemical reductionmethod, and the nano material emits fluorescence under 254 nm ultraviolet light excitation; on the basis that organic nitrogen and sulfur pesticides can quench the fluorescence of the copper nano material, a fluorescence colorimetric sensor is built for detecting the organic nitrogen and sulfur pesticides. According to the method, cetyl trimethyl ammonium bromide and copper chloride dihydrate aremixed in water and then subjected to a reduction reaction, and the copper nanosheet material is obtained, and the prepared copper nanosheet has the advantages of being excellent in fluorescence performance, good in stability and simple in preparation method. The organic nitrogen and sulfur pesticide detection method based on the built fluorescence colorimetric sensor has the advantages of being low in detection cost and simple in method, and the method has great potential in field detection of actual samples.

Description

technical field [0001] The invention belongs to the technical field of pesticide detection, and in particular relates to a detection method of organic nitrogen-sulfur pesticides. Background technique [0002] The world population has been in the process of continuous growth, making the human demand for food also increase. As an important tool to increase crop yield, chemical pesticides are widely used by humans to control plant diseases and insect pests. On the one hand, the use of pesticides has increased food production, but on the other hand, it has also brought great hidden dangers to human life safety and environmental sanitation. In recent years, with the improvement of the quality of life, the detection of pesticide residues has attracted more and more attention. [0003] At present, the main methods for the detection of pesticide residues are: chromatography and mass spectrometry (including gas chromatography and gas chromatography, liquid chromatography and liquid...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 冯亮陈淑琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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