Method for preparing metal carrier stirring extraction rod

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

Inactive Publication Date: 2011-03-30
TIANJIN CHUNFA BIO TECH GRP
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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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  • Method for preparing metal carrier stirring extraction rod
  • Method for preparing metal carrier stirring extraction rod
  • Method for preparing metal carrier stirring extraction rod

Examples

Experimental program
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Effect test

Embodiment 1

[0033] An iron rod with a length of 25 mm and a diameter of 2 mm was selected, and its surface was pretreated with dichloromethane. Take by weighing 100g epoxy resin, add xylene and stir until completely dissolving, then add 15g pyromellitic anhydride, 15g tertiary amine and 20g asbestos powder successively, stir to make each component disperse evenly, make high temperature resistant epoxy resin; The surface of the pretreated rod body is coated with a layer of high-temperature resistant epoxy resin, and then a layer of Carbograph is applied to the outer layer, and placed in an oven for curing at 180°C for 60 minutes. In the extractor, reflux with dichloromethane at 60°C for 40 minutes.

[0034] Wherein the epoxy resin is a polyfunctional glycidyl type epoxy resin, which is available in the market.

Embodiment 2

[0036] A nickel rod with a length of 25 mm and a diameter of 2 mm was selected, and its surface was pretreated with dichloromethane. Coat a layer of silicone resin on the surface of the pretreated rod, then dip a layer of Carbograph on the outer layer, put it in an oven and cure it at 180°C for 60 minutes, and place the prepared stirring extraction rod in a Soxhlet extractor Among them, reflux with dichloromethane at 60°C for 40min.

Embodiment 3

[0038] A stainless steel rod with a length of 25 mm and a diameter of 2 mm was selected, and its surface was pretreated with dichloromethane. Coat a layer of silicone resin on the surface of the pretreated rod, then dip a layer of clay on the outer layer, put it in an oven and cure it at 180°C for 60 minutes, and place the prepared stirring extraction rod in a Soxhlet extractor During this time, dichloromethane was used to reflux at 60° C. for 40 min.

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Abstract

The invention discloses a method for preparing a metal carrier stirring extraction rod, and relates to the field of trace analysis of organic matters in foods, environment and biological samples. The method comprises the following steps of: (a) selecting a metal rod with the length of 10 to 40mm and the diameter of 0.5 to 5mm, and performing surface pretreatment; and (b) coating a layer of heat-resistant epoxy resin or organic silicon resin on the surface of the metal rod subjected to surface pretreatment, and dipping a layer of adsorbent on the outer layer to obtain a coat, or repeatedly coating and dipping to adjust the thickness of the coat, wherein the adsorbent is one ore more of graphitized carbon black, silica gel and clay. The stirring extraction rod prepared by the method has high mechanical strength, is firm and durable, is favorable for the adsorbent to perform treatment on a liquid sample and static headspace capture, and is particularly suitable for analyzing trace contaminants in water and air.

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 preparation method of a metal carrier stirring extraction rod. 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 affect the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/10B01J20/12B01J20/28B01J20/32B01D15/08
Inventor 邓莉郝学财邢海鹏
Owner TIANJIN CHUNFA BIO TECH GRP
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