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Method for detecting carbamate pesticide based on CdTe quantum dot paper chip substrate

A technology of carbamates and quantum dots, applied in the field of paper chip sensing, can solve the problems of rapid on-site detection of pesticide residues, cumbersome operation procedures, complex and sophisticated instruments, etc., and achieve rapid on-site detection, sensitivity and selection High performance and fast response

Active Publication Date: 2019-05-28
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional pesticide residue detection methods include liquid chromatography, gas chromatography coupled with mass spectrometry, enzyme inhibition method, etc., all of which involve complex and precise instruments, cumbersome operating procedures, etc., so that their application is limited and not enough to meet the Therefore, it is necessary to establish a simple, economical, fast, and instrument-free method for the detection of pesticide residues on the spot.

Method used

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  • Method for detecting carbamate pesticide based on CdTe quantum dot paper chip substrate
  • Method for detecting carbamate pesticide based on CdTe quantum dot paper chip substrate
  • Method for detecting carbamate pesticide based on CdTe quantum dot paper chip substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The method for detecting amecarb based on CdTe quantum dot paper chip substrate, comprising steps:

[0041] (1) Synthesis of CdTe quantum dots

[0042] Dissolve cadmium dichloride (0.1096g) and N-acetyl-L-cysteine ​​(0.1567g) in 40mL of ultrapure water, and after stirring for 15 minutes at normal temperature and pressure, adjust the pH of the solution with sodium hydroxide solution. Adjusted to 4.60, then filled with nitrogen and stirred in an ice bath for 20 minutes, added sodium tellurite (0.0532g, 2.5mM), stirred for 15 minutes; then added sodium borohydride (0.0109g), stirred for 15 minutes, and finally put this solution into In the reaction kettle, react in an oven at 200°C for 50 minutes, and after cooling to room temperature, the emission wavelength is 550nm, green light is emitted, and the concentration is 2.51×10 -5 mol / L CdTe quantum dots.

[0043] (2) Synthesis of tetrakis-(4-pyridyl)zinc porphyrin self-assembly solution

[0044] Weigh 0.0037g four-(4-pyri...

Embodiment 2

[0064] Detection of carbofuran based on CdTe quantum dot paper chip substrate detection, including steps:

[0065] (1) Preparation of paper chip substrate and tetrakis-(4-pyridyl) zinc porphyrin self-assembly solution

[0066] The preparation of the paper chip substrate and tetrakis-(4-pyridyl) zinc porphyrin self-assembly solution was the same as in Example 1.

[0067] (2) Making Carbofuran standard color chart

[0068] Mix different concentrations of Methiocarb (1-20 μg / L) with tetrakis-(4-pyridyl) zinc porphyrin self-assembly solution (17.85 μM), draw 10 μL of the mixed solution with a pipette gun and drop it on the paper chip substrate , there are different color changes observed in the ultraviolet dark box, combined with Figure 6 As shown, as the concentration of carbofuran increases, the color on the substrate of the paper chip changes from dark green to yellow-green, then to light green, and finally to green, achieving the visual detection of carbofuran on paper, and...

Embodiment 3

[0076] The method for detecting carbaryl based on CdTe quantum dot paper chip substrate detection, comprising steps:

[0077] (1) Preparation of paper chip substrate and tetrakis-(4-pyridyl) zinc porphyrin self-assembly solution

[0078] The preparation of the paper chip substrate and tetrakis-(4-pyridyl) zinc porphyrin self-assembly solution was the same as in Example 1.

[0079] (2) Making Carbaryl Standard Color Card

[0080] Mix different concentrations of carbaryl (1-20 μg / L) with tetrakis-(4-pyridyl) zinc porphyrin self-assembly solution (17.85 μM), and pipette 10 μL of the mixed solution to drop onto the paper chip substrate , there are different color changes observed in the ultraviolet dark box, combined with Figure 7 As shown, as the concentration of carbaryl increases, the color on the substrate of the paper chip changes from dark green to yellow-green, then to light green, and finally to green, to achieve the visual detection of carbaryl on paper, and to take pi...

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Abstract

The invention relates to the field of paper chip sensing, in particular to a method for detecting carbamate pesticide based on a CdTe quantum dot paper chip substrate. The method for detecting carbamate pesticide based on the CdTe quantum dot paper chip substrate comprises the steps of 1 synthesizing a CdTe quantum dot, 2 synthesizing a tetrakis-(4-pyridyl)zinc protoporphyrin self-assembling solution, 3 preparing the CdTe quantum dot paper chip substrate, 4 manufacturing a carbamate pesticide standard color card and 5 detecting the concentration of carbamate pesticide in a to-be-tested sample.Compared with an existing carbamate pesticide detecting method, the method has the advantages that preparation is easy, on-site detection can be rapidly performed, the cost is low, the response speedis high, and sensitivity and selectivity are high; the CdTe quantum dot paper chip substrate has the specific reaction with carbamate pesticide and can be used for detecting carbamate pesticide in acomplex substrate water sample.

Description

technical field [0001] The invention relates to the field of paper chip sensing, in particular to a method for detecting carbamate pesticides based on a CdTe quantum dot paper chip substrate. Background technique [0002] my country is a big agricultural country, and it is also the country that produces and uses the most pesticides. Pesticides play a very important role in the prevention and control of agricultural and forestry diseases, insects, grasses and other harmful organisms, but at the same time, pesticides will remain in crops and the environment, causing food and environmental pollution. The European Food Safety Authority stipulates that the maximum pesticide residue in food is 10μg / L. Eating food with pesticide residues by mistake is likely to cause acute poisoning and other symptoms, so it is of great significance to strengthen the research on the analysis methods of pesticide residues in food. [0003] As an excellent fluorescent nanomaterial, water-soluble qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N21/80G01N21/84
Inventor 付海燕胡鸥佘远斌
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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