Method for preparing silver plating PEEK tube for in-tube solid phase microextraction

An extraction and chemical silver plating technology, which is applied in solid solvent extraction, liquid chemical plating, metal material coating process, etc. Highly reproducible effect

Inactive Publication Date: 2015-03-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has almost no extraction ability, and the chemically stable smooth inner wall is difficult to chemically modify with common extraction coating materials.
Therefore, the application of PEEK tubes in in-tube solid phase microextraction is limited

Method used

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  • Method for preparing silver plating PEEK tube for in-tube solid phase microextraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 : Preparation of 20 cm long 0.1 mm inner diameter silver-coated PEEK tubing

[0017] Take a PEEK tube with a length of 20 cm and an inner diameter of 0.1 mm, wash it with dilute hydrochloric acid, water, and methanol in order to remove impurities on the inner surface, and inject an electroless silver plating reaction solution mixed with silver ammonia solution and potassium sodium tartrate solution. The molar ratio of silver ammonium ions to potassium sodium tartrate is 1:1, the mass percentage of potassium sodium tartrate is 20%, the controlled reaction temperature is 20°C, after reacting for 3 hours, rinse with water and methanol successively, and dry with nitrogen, Heating and aging at 50 ℃ for 0.5 hours in a nitrogen protection environment, the number of electroless silver plating was 1 time, and a silver coating with a suitable thickness was obtained. The scanning electron microscope image of the prepared silver coating is attached figure 1 shown.

Embodiment 2

[0018] Example 2 : Preparation of 30 cm long 0.18 mm inner diameter silver-coated PEEK tubing

[0019] Take a PEEK tube with a length of 30 cm and an inner diameter of 0.18 mm, wash it with dilute hydrochloric acid, water, and methanol in order to remove impurities on the inner surface, and inject an electroless silver plating reaction solution mixed with silver ammonia solution and potassium sodium tartrate solution. The molar ratio of silver ammonium ions to potassium sodium tartrate is 1:2, the mass percentage of potassium sodium tartrate is 15%, the controlled reaction temperature is 25°C, after reacting for 6 hours, rinse with water and methanol successively, and dry with nitrogen, Heating and aging at 70 ℃ for 2.5 hours in a nitrogen-protected environment, the number of electroless silver plating was 2 times, and a silver coating with a suitable thickness was obtained.

Embodiment 3

[0020] Example 3 : Preparation of 50 cm long 0.25 mm inner diameter silver-coated PEEK tubing

[0021] Take a PEEK tube with a length of 50 cm and an inner diameter of 0.25 mm, wash it with dilute hydrochloric acid, water, and methanol in order to remove impurities on the inner surface, and inject an electroless silver plating reaction solution mixed with silver ammonia solution and potassium sodium tartrate solution. The mol ratio of silver ammonium ion and potassium sodium tartrate is 1:1.8, and the mass percentage composition of potassium sodium tartrate is 10%, and the control reaction temperature is 30 ℃, and after reacting for 9 hours, rinse with water and methanol successively, and after drying with nitrogen, Heating and aging at 80 ℃ for 4 hours in a nitrogen-protected environment, the number of electroless silver plating was 4 times, and a silver coating with a suitable thickness was obtained.

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Abstract

The invention discloses a method for preparing a silver plating PEEK tube for in-tube solid phase microextraction, and in particular relates to modification of a silver plating layer with a micrometer structure to the inner wall of the PEEK tube by utilizing chemical silver plating reaction. The new method is characterized in that the PEEK tube which is low in cost, easily available and high in mechanical strength and is conveniently connected with a high performance liquid chromatograph is used as a carrier, the silver plating layer serving as an extraction coating is prepared on the inner wall of the PEEK tube by utilizing a chemical plating method having the advantages of compactness, uniform thickness, high stability and the like of the plating layer. An in-tube solid phase microextraction coating material prepared by the method has the advantages of high selectivity, stable extraction performance, strong enrichment capacity, long service life, simplicity and convenience in preparation method, low cost and the like, can be used for performing on-line enrichment analysis on trace target analytes in samples such as food, environment, medicines, biochemistry and the like under the combination of a liquid chromatogram process, and is high in utilization potentiality.

Description

technical field [0001] The invention relates to a technique for preparing a solid-phase microextraction coating in a tube by electroless silver plating on the inner wall of a PEEK tube. Background technique [0002] Solid-phase microextraction, which appeared in the 1990s, is a new type of sample pretreatment technology, because of its low cost, strong enrichment ability, fast analysis speed, easy operation, and convenience for on-site analysis and instrument connection. , has been widely used in the enrichment analysis of trace components in food, environmental, pharmaceutical and biochemical samples. Solid-phase microextraction materials are divided into two categories: solid-phase microextraction fibers and in-tube solid-phase microextraction tubes according to their forms. Solid-phase microextraction fibers are often used in conjunction with gas chromatography. Although high-sensitivity detection can be achieved, in practical applications It is found that there are larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44B01D11/02
Inventor 孙敏冯娟娟罗川南步亚南王俊凯
Owner UNIV OF JINAN
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