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Solid phase microextraction of diethyl phthalate based on molecular imprinting technique

A technology of diethyl phthalate and molecular imprinting technology, applied in the field of analytical chemistry, can solve the problems of low DEP concentration and large matrix interference

Inactive Publication Date: 2021-06-15
CHONGQING IND POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide the diethyl phthalate solid-phase microextraction method based on molecular imprinting technology, to solve the problem that the concentration of DEP in environmental sample species is low, matrix interference is big

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  • Solid phase microextraction of diethyl phthalate based on molecular imprinting technique
  • Solid phase microextraction of diethyl phthalate based on molecular imprinting technique
  • Solid phase microextraction of diethyl phthalate based on molecular imprinting technique

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Embodiment

[0040] The invention discloses a diethyl phthalate solid-phase microextraction method based on molecular imprinting technology, comprising the following steps:

[0041] S1: Prepare extraction head:

[0042] S1.1: Sonicate 0.2mmol target molecule DEP and 0.8mmol functional monomer MAA in 860μL of acetonitrile for 10min and let it stand for 14h to fully coordinate the template molecule and functional monomer; then add 100mg bonded -C=C- functional group multi-walled carbon nanotubes MWCNTS, ultrasonically dispersed for 1 h, then added 4.0 mmol EGDMA and 20 mg AIBN, nitrogen deoxygenated for 5 min, ultrasonic 1 hour to form a uniformly mixed solution.

[0043] S1.2: Take a capillary tube with a length of 35 cm and an inner diameter of 530 μm and use nitrogen to remove the air, fill the solution obtained in step S1.1 into the capillary tube, seal both ends with rubber plugs, and then put the capillary tube Put it into a constant temperature water bath, and react at 60°C for 24h; ...

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Abstract

The invention discloses a method for diethyl phthalate solid-phase microextraction based on molecular imprinting technology, comprising the following steps: using a capillary with an inner diameter of 530 μm to perform in-situ reaction in the capillary to prepare molecular imprinting of DEP material, the size and position of the synthesized holes can be adjusted by changing the ratio of the mixture and adding multi-walled carbon nanotubes modified by -C=C-groups, and then each fiber can be One end of the capillary was cut off with 1cm of capillary wall, so that the synthesized polymer can be exposed, which is to prepare the surface molecular imprinting-solid-phase microextraction head of DEP. The micro-extraction method proposed by the present invention has good selectivity of molecular imprinting technology, strong acid and alkali corrosion resistance, good thermal stability, and is very suitable for trace analytes. It has good extraction ability and shows a high degree of chemical structure. Excellent stability and long service life, low cost.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a diethyl phthalate solid-phase microextraction method based on molecular imprinting technology. Background technique [0002] Diethyl phthalate (DEP), as a substance of phthalate products, is often used as a plasticizer for plastics, resins and rubber products in industrial production, and is an important class of environmental hormone compounds. Due to its long residual period in the natural environment, organisms have a strong enrichment effect on DEP. Once it enters the natural ecosystem, the harm to human health is immeasurable. Therefore, it has been assessed by the country as an environmental priority pollution control. thing. Due to the extensive use of human phthalates, they accumulate in the environment, but the matrix of environmental samples is very complex, and phthalates are trace pollutants in the environment, so the monitoring of phthalates It is difficult, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/38B01J20/283G01N30/02G01N30/06B01J20/30
Inventor 邓冬莉邓灏
Owner CHONGQING IND POLYTECHNIC COLLEGE