A pesticide residue detection method for removing impurities by magnetic carbon nanotubes

A magnetic carbon nanotube, pesticide residue detection technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of limited removal effect and high removal cost, achieve rapid separation and enrichment, difficult separation, regeneration and reuse Effect

Active Publication Date: 2016-03-16
罗牛山腾德检测认证服务(海南)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 method for detecting pesticide residues, and the technical problem it solves is 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 the removal effect is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Take 1mL of anhydrous acetic acid and 49mL of ethanol and mix them uniformly as a solvent, add 1mL of ethylenediamine, and then add 2g of carboxylated carbon nanotubes with a diameter of 10-20nm and a length of 1-10μm. After ultrasonic dispersion for 30 minutes to mix the solution uniformly, the reaction was carried out at 50° C. for 24 hours. After the reaction was complete, the solution was taken out and centrifuged in a centrifuge. The rotation speed is 4000r / min, and the separation is performed 3 times, each time for 30 minutes, and the washing solution added is absolute ethanol. After the separation is completed, further suction filtration, the filter membrane pore size is 220nm, the added washing liquid is absolute ethanol, suction filtration 3 times. After the suction filtration is completed, vacuum-dry at room temperature for 24 hours in a vacuum drying oven to obtain dry functionalized carbon nanotubes.

[0030] Step 2: Take 1 g of ground functionaliz...

Embodiment 2

[0038] Step 1: Take 2mL of anhydrous acetic acid and 98mL of ethanol and mix them uniformly as a solvent, add 1mL of dimethylformamide, and then add 1g of carbon nanotubes with a diameter of 30-40nm and a length of 1-10μm. After ultrasonic dispersion for 30 minutes to mix the solution uniformly, the reaction was carried out at 50° C. for 24 hours. After the reaction was complete, the solution was taken out and centrifuged in a centrifuge. The rotation speed is 4000r / min, and the separation is performed 3 times, each time for 30 minutes, and the washing solution added is absolute ethanol. After the separation is completed, further suction filtration, the filter membrane pore size is 220nm, the added washing liquid is absolute ethanol, suction filtration 3 times. After the suction filtration is completed, vacuum dry at room temperature in a vacuum oven for 24 hours to obtain dry functionalized carbon nanotubes CNT-NH 2 .

[0039] Step 2: Take 1 g of ground CNT-NH 2 To 50mL f...

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Abstract

The invention relates to a pesticide residue detection method capable of clearing impurities through a magnetic carbon nano tube. The method comprises the steps of uniformly plating the surface of a modified carbon nano tube with magnetic particles by a chemical plating method to obtain the magnetic carbon nano tube, wherein the diameters of magnetic particles are about 10-30 nm; activating the magnetic carbon nano tube; and uniformly mixing a pesticide-containing vegetable extracting solution sample and an activated magnetic material, wherein the activated magnetic material adsorbs impurities in the vegetable extracting solution sample under the assistance of an external magnetic field. The magnetic carbon nano tube with large surface area is used as an impurity adsorbent in pesticide detection, can adsorb pigments from a complicated substrate under the mutual action of electrons and the dewatering action of the carbon nano tube and can adsorb compounds, such as organic acids and phenols, under the weak anion exchange action obtained by the fact that the surfaces of the magnetic nano particles are grafted with polymers.

Description

technical field [0001] The invention relates to a method for detecting pesticide residues, in particular to a method for detecting pesticide residues by removing impurities through carbon nanotubes. Background technique [0002] Pesticides are widely used in agricultural production to improve product quality and yield, but the hazards of pesticide residues are also becoming more and more serious. Developed countries have successively established limit standards for pesticide residues in agricultural products. However, most agricultural product extracts are mixtures 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 the prerequisite for accurate analysis and identification. [0003] At present, for the analysis of multi-component pesticide residues, the main process is to first use vibration homogenization, solvent extraction and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/14
Inventor 张成杨光
Owner 罗牛山腾德检测认证服务(海南)有限公司
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