A kind of solid-phase microextraction fiber and its preparation method and application

Abstract

The invention discloses a solid phase micro-extraction fiber. The solid phase micro-extraction fiber comprises a stainless steel wire and a coating, and the oxygen atom percentage of elements on the surface of the stainless steel wire is not smaller than 30%. The invention also provides a preparation method of the solid phase micro-extraction fiber, and an application of the solid phase micro-extraction fiber in manufacturing of solid phase micro-extraction products. The solid phase micro-extraction fiber has the advantages of firm combination between the coating and the stainless steel wire, difficult shedding, long service life, good temperature resistance, good organic solvent resistance, good acid and alkali resistance, and also combines the respective advantages of solid phase micro-extraction fibers with fused quartz as a matrix material and solid phase micro-extraction fibers with stainless steel wires as a matrix material;, the solid phase micro-extraction fiber has better extraction performance and higher detection sensitivity than commercial extract fibers; and the fiber prepared in the invention has good reappearance and repeatability, and is very suitable for industrial practical application.

Description

technical field [0001] The invention relates to a solid-phase micro-extraction fiber and its preparation method and application. Background technique [0002] Solid-phase microextraction (solid-phase microextraction, SPME) technology is a new technology of sample microextraction that integrates sampling, extraction, enrichment and sample introduction. It has become one of the most widely used sample pretreatment techniques at present. [0003] SPME technology is realized through a solid phase microextraction device consisting of a handle and a solid phase microextraction fiber (or called an extraction head); among them, the solid phase microextraction fiber is the most critical factor of the SPME technology, which directly affects the extraction And / or the effect of enrichment, and then affect the accuracy and sensitivity of the detection results. [0004] A solid-phase microextraction fiber with good performance not only needs to choose a suitable matrix material and coat...

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Problems solved by technology

However, the coating on the surface of this type of solid phase microextraction fiber is not firmly bonded to the stainless steel wire (Wang Liting and Yang Ruiqin. Preparation of carbon nano solid phase microextraction fiber and its application in water sample analysis. Chemical Engineering and Equipment, 2012 No. 11 of 2010.), prone to coating shedding, which seriously affects the extraction and / or enrichment effect and service life of the solid phase microextraction fiber

In order to overcome this defect, those skilled in the art often need to use terpineol / ethyl cellulose / dibutyl phthalate, perfluorosulfonic acid, etc. mixture, however, its effect is not ideal, and the addition of the sticky (sticky) mixture not only increases the difficulty of preparing the solid-phase microextraction fiber, but also adversely affects the performance of the solid-phase microextraction fiber, which is difficult to meet The requirements of industrial applications also bring great difficulties to the commercialization of solid phase microextraction fibers with stainless steel wire as the matrix material.

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