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A kind of solid phase microextraction fiber coating and its preparation method and application

A technology for extracting fibers and coatings, applied in the fields of analytical chemistry and environmental analysis, can solve the problems of low selectivity, expensive SPME, poor mechanical and thermal stability of coatings, etc., to reduce extraction steps and improve analysis. The effect of improving speed and extraction capacity

Active Publication Date: 2021-08-17
合肥名龙电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The challenges of SPME mainly include: commercialized SPME is expensive, the types of solid-phase coating materials are limited, there is a lack of general and simple coating technology, and related theories need to be perfected, etc.
In the use of commercial SPME, its extraction head is easy to break, the mechanical and thermal stability of the coating are poor, and it is mainly non-specific adsorption, the selectivity is not high, and it cannot meet the selective extraction of target components in complex systems. requirements

Method used

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  • A kind of solid phase microextraction fiber coating and its preparation method and application
  • A kind of solid phase microextraction fiber coating and its preparation method and application
  • A kind of solid phase microextraction fiber coating and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation and application of embodiment 1 solid phase microextraction fiber coating

[0028] One, such as figure 1 Shown, the preparation method of the solid-phase microextraction fiber coating of the present embodiment is:

[0029] In the first step, multi-walled carbon nanotubes are deposited by the potentiostatic method. The specific method is as follows:

[0030] Weigh 0.0200g of multi-walled carbon nanotubes and 0.0150g of sodium lauryl sulfate in a 10mL beaker, add 10mL of ultrapure water, ultrasonicate for 15min, adopt a three-electrode system, use stainless steel wire as the working electrode, platinum electrode as the counter electrode, calomel The electrode was used as a reference electrode, deposited at a constant potential of -2.0V for 1000s, and then washed with water for 1h under magnetic stirring to obtain a multi-walled carbon nanotube coating.

[0031] In the second step, the multi-walled carbon nanotube / manganese dioxide binary composite coati...

experiment example 1

[0038] Thermogravimetric Analysis of Experimental Example 1 Solid Phase Microextraction Fiber Coating

[0039] Thermogravimetric analysis (also known as thermogravimetric analysis or thermogravimetric analysis; Thermogravimetric analysis, TGA) is a method that changes the physical and chemical properties of substances with the increase of temperature (equal heating rate) or time (isothermal temperature and / or loss of mass conservation). . From Figure 4 The thermogravimetric analysis shows that the material begins to decompose after 300°C, so the thermal stability of the multi-walled carbon nanotube / manganese dioxide / poly3,4-ethylenedioxythiophene fiber coating at the desorption temperature of 280°C Good, suitable for solid phase microextraction process.

experiment example 2

[0040] Experimental Example 2 Extraction Effect Detection

[0041] 1. MWCNTs / MnO of the present invention 2 Determination of the linear range, detection limit, recovery rate and precision of PEDOT coating on polycyclic aromatic hydrocarbons

[0042] Under the optimized experimental conditions, the extraction time is 20min, the extraction temperature is 35°C, the stirring speed is 200r / min, the ionic strength is 0.3g / mL NaCl solution, and the desorption time is 3min. The linear range and detection limit are shown in Table 1 below. The comparison of phase microextraction methods is shown in Table 2.

[0043] Table 1 The linear range, detection limit, recovery rate and precision of polycyclic aromatic hydrocarbons in soil determined by micro-extraction device

[0044]

[0045] Table 2 This patent compares with other solid-phase microextraction methods

[0046]

[0047] It can be seen from the above table 1 that the detection limit is low (the detection limit reaches the ...

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Abstract

The invention discloses a preparation method of a solid-phase microextraction fiber coating. The first step is to deposit multi-walled carbon nanotubes on stainless steel wires by a constant potential method by optimizing synthesis conditions. The second step is to deposit nanoparticle manganese dioxide on the surface of multi-walled carbon nanotubes by constant potential method. The third step is to polymerize 3,4-ethylenedioxythiophene by cyclic voltammetry on the surface of manganese dioxide; apply the fiber coating to solid-phase microextraction separation of trace organic pollutants in complex actual samples such as food and environment. Set up and establish a qualitative and quantitative analysis method with high sensitivity, which can realize the separation and enrichment of polycyclic aromatic hydrocarbons; it has the advantages of high selectivity, large enrichment multiple, low detection limit, wide linear range and good reproducibility.

Description

technical field [0001] The invention relates to the technical fields of analytical chemistry and environmental analysis, in particular to a solid-phase micro-extraction fiber coating. Background technique [0002] Solid phase microextraction (SPME) is a new type of sample pretreatment technology, which was first proposed by the Pawliszyn research group in Canada in 1989. This technology integrates sampling, extraction, enrichment and sample injection, does not consume solvents, and can be used online with other instruments. It has developed rapidly in less than 20 years, and various types of extraction media have emerged continuously. . The basic principle of SPME is to immobilize the coating material with adsorption function on the surface of a certain matrix fiber by physical or chemical methods, make direct or indirect contact with the sample, enrich and concentrate the target analyte, and combine it with The sample injection device or directly desorbs and injects the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/285B01D15/08B01J20/30G01N30/02G01N30/06
CPCB01D15/08B01J20/285B01J2220/46B01J2220/54G01N30/02G01N30/06G01N2030/062
Inventor 党雪平马茜文陈怀侠陈建雄
Owner 合肥名龙电子科技有限公司
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