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A magnetic carbon nanotube used in the detection of pesticide residues

A magnetic carbon nanotube and pesticide residue detection technology, applied in the field of carbon nanotubes, can solve the problems of high cleaning cost and limited cleaning effect, and achieve the effects of rapid separation and enrichment, difficult separation, and excellent controllability of orientation

Active Publication Date: 2016-08-24
广州国标检验检测有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention designs a magnetic carbon nanotube used in the detection of pesticide residues, which solves the technical problem that the removal cost of interference substances such as pigments, organic acids and phenols in agricultural products in the pretreatment of the existing pesticide residue detection samples is high, and Clearing is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Take 1 mL of anhydrous acetic acid and 49 mL of ethanol and mix them uniformly as a solvent, add 1 mL of ethylene diamine, and then add 2 g of carboxylated carbon nanotubes with a tube diameter of 10-20 nm and a tube length of 1-10 μm. After ultrasonic dispersion for 30 minutes to make the solution uniform, react at 50°C for 24 hours. After the reaction is completed, the solution is taken out and centrifuged in a centrifuge. The speed is 4000r / min, the separation is 3 times, each time is 30 minutes, and the added lotion is absolute ethanol. After the separation is completed, further suction filtration, the pore size of the filter membrane is 220nm, the added washing liquid is absolute ethanol, and the suction filtration is performed 3 times. After the suction filtration is completed, vacuum drying is carried out at room temperature in a vacuum drying box for 24 hours to obtain dried functionalized carbon nanotubes.

[0032] Step 2: Take 1 g of the ground function...

Embodiment 2

[0040] Step 1: Take 2 mL of anhydrous acetic acid and 98 mL of ethanol and mix them evenly as a solvent, add 1 mL of dimethylformamide, and then add 1 g of carbon nanotubes with a tube diameter of 30-40 nm and a tube length of 1-10 μm. After ultrasonic dispersion for 30 minutes to make the solution uniform, react at 50°C for 24 hours. After the reaction is completed, the solution is taken out and centrifuged in a centrifuge. The speed is 4000r / min, the separation is 3 times, each time is 30 minutes, and the added lotion is absolute ethanol. After the separation is completed, further suction filtration, the pore size of the filter membrane is 220nm, the added washing liquid is absolute ethanol, and the suction filtration is performed 3 times. After the suction filtration is completed, dry in a vacuum drying oven at room temperature for 24 hours to obtain dried functionalized carbon nanotubes CNT-NH 2 .

[0041] Step 2: Take 1g of ground CNT-NH 2 To 50 mL flask B, add 6 mL trieth...

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Abstract

The invention relates to a magnetic carbon nanotube used in the detection of pesticide residues. The chemical plating method is used to evenly plate magnetic particles on the surface of the modified carbon nanotube, and the diameter of the magnetic particle is about 10-30nm to obtain a magnetic carbon nanotube; After the carbon nanotubes are activated; the vegetable extract sample containing pesticides is mixed with the activated magnetic material evenly, and the activated magnetic material is assisted by an external magnetic field to absorb the magnetic material of the vegetable extract sample impurities. The present invention uses magnetic carbon nanotubes as impurity adsorbents in pesticide detection, the magnetic carbon nanotubes have a large surface area, and can absorb pigments from complex matrices through the electronic interaction and hydrophobic effect of carbon nanotubes, and graft the surface of magnetic nanoparticles The weak anion exchange effect of the polymer can adsorb organic acids, phenols and other compounds.

Description

Technical field [0001] The invention relates to a carbon nanotube, in particular to a magnetic carbon nanotube used in pesticide residue detection. Background technique [0002] Pesticides are widely used in agricultural production to improve product quality and yield, but the hazards of pesticide residues are becoming more and more serious. Developed countries have successively established limit standards for pesticide residues in agricultural products. However, agricultural product extracts are mostly a mixture of many different substances, and the content of the target compound to be detected is often very low. Therefore, effective sample pretreatment including separation, purification and enrichment is a prerequisite for accurate analysis and identification. [0003] At present, for the analysis of multi-component pesticide residues, the main process is to first use techniques such as oscillatory homogenization and solvent extraction for sample extraction; then use solid phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28G01N30/02
Inventor 张成杨光
Owner 广州国标检验检测有限公司
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