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Gas flow type dynamic liquid phase micro-extraction method

An airflow and dynamic technology, applied in the preparation of test samples, etc., can solve problems such as difficult quantitative analysis, time-consuming, difficult operation, etc.

Inactive Publication Date: 2010-08-25
延边科创超声波设备技术开发有限公司
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, such as time-consuming, difficult operation, difficult quantitative analysis, and difficult extraction under higher sample heating temperature conditions, and invented the airflow dynamic liquid phase microextraction method

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  • Gas flow type dynamic liquid phase micro-extraction method
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  • Gas flow type dynamic liquid phase micro-extraction method

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Embodiment Construction

[0016] refer to figure 1 , the specific experimental process is as follows: ①The inert gas 1 is introduced into the sample cell 3 under the control of the mass flow controller 2; ②Under high temperature (room temperature-310°C) heating conditions, the liquid or solid target 4 in the sample matrix evaporates quickly to In the gas phase, a gaseous target object 5 is formed; ③ driven by the inert gas, the gaseous target object 5 reaches the surface of the extraction solvent 7 in the microinjection needle barrel 8 through the microinjection needle 6; ④ when the inert gas passes through the extraction solvent 7, Small bubbles are produced (the bubbles are attached to the extraction solvent 7) and an organic liquid film 9 is formed on the inner wall of the microinjection needle barrel 8, and the gaseous target substance 5 is adsorbed by the extraction solvent 7 and the organic liquid film 9 simultaneously in the process, And the inert gas 1 leaves the extraction system from the micr...

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Abstract

The invention discloses a gas flow type dynamic liquid phase micro-extraction method. An extraction system is a semi-closed system containing inert gases; substances to be measured are heated at high temperature to be changed into gaseous substances, and complete and quick separation of non-volatile substances, volatile substances and semi-volatile substances in complex samples is realized; the gaseous substances to be measured are transferred into an extraction phase in a micro-injection needle through an adaptor under the flow of the inert gases; the flow of the inert gases and a extraction solvent in the micro-injection needle are used for realizing the semi-closed system; and finally, complete and quick enrichment is realized. In the extraction process, the contact area between an object and the extraction solvent is enlarged by using a small amount of the extraction solvent in a mode of forming an organic micro-liquid membrane. The method has the main advantage of realizing simultaneous and quick separation and complete enrichment of volatile organic components, semi-volatile organic components and non-volatile components, and instrument analysis can be directly carried out after the method is used for extracting.

Description

technical field [0001] The invention relates to a sample pretreatment method integrating extraction, refining and concentration, especially a method that can be applied to the simultaneous rapid separation and complete separation of volatile and semi-volatile organic components and non-volatile components in complex sample matrices. Enrichment, and the air flow dynamic liquid phase microextraction method that can be directly analyzed by the instrument after extraction by this method. technical background [0002] At present, in order to increase the enrichment rate of the target substance by micro-enrichment technology, the methods adopted are mainly to increase the temperature of the sample, decrease the temperature of the extraction solvent and increase the surface area of ​​the extraction solvent. However, it is well known that when the temperature of the sample increases, the temperature of the extraction solvent is also indirectly increased, which is not conducive to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/40
Inventor 李东浩杨翠朴相范
Owner 延边科创超声波设备技术开发有限公司
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