Method for purifying vegetable containing pyrethroid pesticide residue by using graphene

A technology of pesticide residues and pyrethroids, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of ten milligrams or more and high cost, and achieve the effect of high accuracy, low cost and strong adsorption capacity

Inactive Publication Date: 2012-11-14
CHINA AGRI UNIV
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purification adsorbents used in the analysis of pesticide residues include graphitized carbon black, N-propylethylenediamin

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for purifying vegetable containing pyrethroid pesticide residue by using graphene
  • Method for purifying vegetable containing pyrethroid pesticide residue by using graphene
  • Method for purifying vegetable containing pyrethroid pesticide residue by using graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] Add standard solutions of bifenthrin, fenvalerate, cyhalothrin, permethrin, cyfluthrin, cypermethrin, fenvalerate, and deltamethrin to pre-mashed and homogenized fresh cucumber samples to make The concentration of cyhalothrin in water was 100 μg / L, that of permethrin was 400 μg / L, and that of others was 100 μg / L, and it was allowed to stand for 1 hour. Weigh 5 g of the above sample, add 10 mL of acetonitrile and vortex for 2 minutes to extract, add 3 g of sodium chloride for salting out, and centrifuge at 3800 rpm for 5 minutes. Take 5 mL of the supernatant, add an appropriate amount of graphene and vortex for 1 min to purify; at the same time, take 2 mL of the acetonitrile extract, and purify with an appropriate amount of N-propylethylenediamine-bonded silica gel or graphitized carbon black. Centrifuge at 10,000 rpm for 3 minutes for separation, and take 1 mL of the supernatant into a vial for detection. Detected by Shimadzu GC-ECD, the chromatographic column is HP-5 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for purifying vegetable containing pyrethroid pesticide residue by using grapheme in the field of pesticide residue analysis of vegetables. The method comprises the following steps of (1) extraction, i.e. weighing proper amount of pre-crushed homogenized vegetable sample containing pyrethroid pesticide, adding an extraction solvent into the sample, and performing vortex or vibration extraction; (2) separation, i.e. adding sodium chloride to perform salt precipitation, and performing centrifugal separation; (3) purification, i.e. taking the supernate, adding the grapheme into the supernate, and after the grapheme is fully contacted with the supernate, adding sodium chloride to perform centrifugal separation; and (4) detection, i.e. taking the supernate, adding anhydrous sodium sulfate or magnesium sulfate anhydrous into the supernate, and after the excessive water content is removed, performing gas chromatogram. The grapheme serves as a purifying material, and compared with graphitized carbon black and N-propyl ethylenediamine bonded silica gel which are conventionally used in a laboratory, the grapheme is low in using amount, strong in absorption ability and low in cost; the method is simple, quick and convenient to perform; and the accuracy is high, and the recovery rate is between 96.0 percent and 99.6 percent.

Description

technical field [0001] The invention belongs to the field of analysis of pesticide residues in vegetables, and in particular relates to a method for purifying vegetables containing pyrethroid pesticide residues by using graphene. Background technique [0002] Graphene is a new carbon material in which carbon atoms are tightly packed into a single-layer two-dimensional honeycomb lattice structure. The thickness of this graphite crystal film is only 0.335nm, which is only 1 / 200,000 of hair. The basic unit of several carbonaceous materials (such as zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite). The theoretical specific surface area of ​​graphene material is as high as 2600m 2 / g, with outstanding thermal conductivity (3000W / (m K)) and mechanical properties (1060GPa), as well as high-speed electron mobility at room temperature (15000cm 3 / (V·s)). In addition, its special structure makes it have a series of properties such as ha...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N30/06
Inventor 马永强武晓丽张红艳刘晓彤孟丽萱
Owner CHINA AGRI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap