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Preparation method of metal carrier Tenax coating stirring and extracting rod

A technology for extracting rods and metal rods, which is applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of high price of SBSE devices, application limitations of SBSE technology, etc., and achieve high mechanical strength. , good thermal stability

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

Twister is made of 0.5mm or 1mm PDMS silicone rubber tube, which is set on a glass tube with an inner magnetic core. However, commercial SBSE devices only have PDMS as a stationary phase coating, and the price of commercial SBSE devices Higher, the application of SBSE technology has been greatly restricted

Method used

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  • Preparation method of metal carrier Tenax coating stirring and extracting rod
  • Preparation method of metal carrier Tenax coating stirring and extracting rod
  • Preparation method of metal carrier Tenax coating stirring and extracting rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An iron rod with a length of 25 mm and a diameter of 2 mm was selected, and its surface was pretreated with dichloromethane. Weigh 100g of epoxy resin, add xylene and stir until completely dissolved, then add 15g of pyromellitic anhydride, 15g of tertiary amine, and 20g of asbestos powder in sequence, and stir to disperse the components evenly. Coat the surface of the treated rod with a layer of high-temperature resistant epoxy resin, then dip a layer of Tenax adsorbent on the outer layer, and place the rod in an oven at 180°C for 60 minutes to cure. The prepared extraction rod was placed in a Soxhlet extractor, and refluxed with dichloromethane at 60° C. for 40 min.

[0032] The epoxy resin is a polyfunctional glycidyl type epoxy resin, which is commercially available. The Tenax sorbent is Tenax TA.

Embodiment 2

[0034] 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 the surface of the treated rod with a layer of silicone resin, then dip a layer of Tenax adsorbent on the outer layer, and place the rod in an oven at 180°C for 60 minutes to cure. The prepared extraction rod was placed in a Soxhlet extractor, and refluxed with dichloromethane at 60° C. for 40 min.

Embodiment 3

[0036] 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 the surface of the treated rod with a layer of silicone resin, and then dip a layer of 2,6-diphenylfuran porous polymer resin on the outer layer, and place the rod in an oven at 180°C for 60 minutes to cure. The prepared extraction rod was placed in a Soxhlet extractor, and refluxed with dichloromethane at 60° C. for 40 min.

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Abstract

The invention relates to a preparation method of a metal carrier Tenax coating stirring and extracting rod, which comprises the following steps of: a, selecting and preprocessing a metal rod; b, synthesizing heat-resistant epoxy resin; c, manufacturing a stirring rod coating; d, curing the coating; and e, removing impurities of the extracting rod body, wherein the extracting rod is used in a stirring manner, and the metal is iron, nickel, cobalt, stainless steel or alloy; and when the extracting rod is used in a headspace or ultrasonic manner, the metal is stainless steel, copper, aluminum or alloy. Tenax is fixed on the surface of the metal rod by using the synthesized heat-resistant epoxy resin or organic silicon resin to form a coating material with heat stability and solvent washing resistance, thus the extracting rod realizes the enrichment of trace organic matters. The invention is especially suitable for processing samples of soil, air, essence and spice, indoor air, alcohol, phenol, amine-aldehyde, ketone, aryl halides and the like.

Description

technical field [0001] The invention belongs to the field of trace analysis of organic matter in food, environment and biological samples, and in particular relates to a method for preparing a Tenax-coated stirring extraction rod with a metal carrier. , Alcohols, phenols, amine aldehydes, ketones, halogenated aromatics and other samples. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/32B01D15/08
Inventor 邓莉郝学财邢海鹏
Owner TIANJIN CHUNFA BIO TECH GRP
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