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Preparation method of stir and extraction bar for polymer coating

A technology of polymer coating and extraction rod, applied in the field of preparation of polymer coating stirring extraction rod, can solve the problems of SBSE technology application limitation, high price of SBSE device, fragile material, etc., to avoid competitive adsorption, high mechanical Good strength and thermal stability

Inactive Publication Date: 2012-11-21
天津市春升清真食品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The commercialized SBSE device uses glass rods as the carrier, the material is fragile, and there is only PDMS as a stationary phase coating, and the price of the commercialized SBSE device is relatively high, so the application of SBSE technology is greatly restricted

Method used

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  • Preparation method of stir and extraction bar for polymer coating
  • Preparation method of stir and extraction bar for polymer coating
  • Preparation method of stir and extraction bar for polymer coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select an iron rod with a length of 25mm and a diameter of 2mm, and use dichloromethane to pretreat its surface; weigh 100g of epoxy resin, add xylene and stir until completely dissolved, then add 15g of pyromellitic anhydride and 15g of tertiary amine in sequence and 20g of asbestos powder, stirred to disperse each component evenly, and prepared a high-temperature resistant epoxy resin, which was stored at 5°C for later use; coated with a layer of high-temperature resistant epoxy resin on the surface of an iron rod pretreated by dichloromethane, and then Dip a layer of Chromosorb-102 on the outer layer, and then put it in an oven to cure at 180°C for 60 minutes. Finally, put the stirring extraction rod after the surface coating curing treatment into a Soxhlet extractor, and use dichloromethane at 60 ℃ reflux for 40 minutes to obtain the finished stirred extraction rod, and the coating thickness of the prepared stirred extraction rod is 230 μm.

[0033] Wherein the epox...

Embodiment 2

[0035] Select a nickel rod with a length of 25 mm and a diameter of 2 mm, pretreat its surface with dichloromethane, coat the surface of the rod pretreated with dichloromethane with a layer of silicone resin, and then dip a layer of Chromosorb on the outer layer -101, then placed in an oven at 180°C for 60 minutes, and finally put the stirring extraction rod after the surface coating curing treatment into a Soxhlet extractor, and refluxed it with dichloromethane at 60°C for 40 minutes to obtain a stirring extraction The rod is finished, and the coating thickness of the obtained stirred extraction rod is 280 μm.

[0036] Among them, Chromosorb-101 belongs to a styrene-divinylbenzene copolymer, which is available in the market.

Embodiment 3

[0038] The polycyclic aromatic hydrocarbons in the water were analyzed by using the stirring extraction stick prepared in Example 1, and the stirring extraction method was adopted, and the solvent method was used for desorption.

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PUM

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Abstract

The invention relates to a stir and extraction bar for a polymer coating and a preparation method thereof, belonging to the field of trace analysis of organic matters in food, environmental and biological samples. The stir and extraction bar for the polymer coating is composed of a carrier and a coating on the surface of the carrier, wherein, the carrier is a metal bar the length and the diameterof which are 10-40mm and 0.5-5mm respectively; and the coating comprises a polymer layer, and the polymer is one or more of a styrene-divinyl benzene copolymer, crosslinked polystyrene or crosslinkedpoly-divinyl benzene. The preparation method comprises the following steps: selecting and pre-treating the bar; dipping the coating on the surface of the bar; and curing the coating and removing impurities to finally obtain the finished product of the stir and extraction bar. The stir and extraction bar has higher mechanical strength and good durability and contains a coating material with good heat stability and solvent washing resistance, thus realizing enrichment of a trace amount of the organic matters. The invention is more beneficial to treatment of the liquid sample and static headspace trapping by an adsorbent.

Description

technical field [0001] The invention relates to the field of trace analysis of organic matter in food, environment and biological samples, in particular to a polymer-coated stirring extraction rod and a preparation method thereof. Background technique [0002] Due to the complex matrix and composition of most analyzed samples, sample pretreatment is usually an indispensable and important step in sample analysis. It plays the role of concentrating the measured trace components, improving the sensitivity of the method and cleaning the sample. [0003] Traditional sample pretreatment methods include liquid-liquid extraction, Soxhlet extraction, chromatography, distillation, adsorption, centrifugation, and filtration, etc., but these methods generally have the disadvantages of using a large amount of organic solvents, long processing time, and many operating steps. These methods are not only easy to lose samples and produce large errors, but also the use of toxic solvents will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/32B01D15/08
Inventor 邓莉郝学财邢海鹏
Owner 天津市春升清真食品有限公司