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Airflow type headspace liquid-phase microextraction method

An air-flow, extraction technology, applied in liquid solution solvent extraction, measurement devices, instruments, etc., can solve problems such as unfavorable enrichment of low-vapor pressure target substances, increase in gas phase volume, and increase in absolute content of target substances in gas phase.

Inactive Publication Date: 2010-01-27
YANBIAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the limited enrichment rate caused by the limited volume of the extraction system in the prior art, which is not conducive to the enrichment of low vapor pressure targets, and provides a method to prolong the enrichment process under the action of inert gas. The method of collecting time to achieve the purpose of increasing the volume of the gas phase in the extraction system, thereby increasing the absolute content of the target substance in the gas phase, and then improving the enrichment rate of the target substance is a gas flow headspace liquid phase microextraction method

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Embodiment Construction

[0012] refer to figure 1 , the specific experimental process is as follows: ① the standard sample or the actual sample is put into the sample bottle 5, ② the inert gas enters the tube 7 and is placed on the upper part of the sample through the PTFE cover matched with the sample bottle 5, and the inert gas enters the tube 7 There is a mass flow controller 8 on it, 3. the sample bottle 5 is put into the heating device 6, a condensation device 2 is installed above the sample bottle 5, and 4. a special equipment for washing a chromatographic injection needle invented by this laboratory is used-- The patent number is 200820071370.4" to clean the chromatographic injection needle 1. The cleaning solvent is determined by the properties of the target. After that, it is washed at least five times with the extraction solvent. Finally, a certain volume of the extraction solvent 3 is taken. Insert the gas outlet tube 4 into the sample bottle 5, and fix the needle tip to a proper position. ...

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Abstract

The invention discloses an airflow type headspace liquid-phase microextraction method. The airflow type headspace liquid-phase microextraction system is an open system, inert gas is introduced into the surface of the sample matrix through an inert gas inlet pipe so as to mix the inert gas with the object in the gaseous phase and also drive the object to move towards the extraction solvent continuously, when passing through the extraction solvent, the object is adsorbed by the extraction solvent, the inert gas flows out the extraction system, and the process is continuously repeated until the extraction ends. The introduction of the inert gas not only increases the rate of evaporation of the object from the sample matrix, but also increases the mass transfer velocity from the object to the extraction solvent, so as to increase the enrichment ratio of the object; as the airflow type headspace liquid-phase microextraction system is an open system, the gaseous phase volume is not limited, which is beneficial for enriching the low vapor-pressure object; and by prolonging the enrichment time, the gaseous phase volume in the enrichment system is enlarged so as to increase the enrichment ratio of the object. The invention has the advantages of the enrichment detection of the low vapor-pressure object.

Description

technical field [0001] The invention relates to a sample pretreatment method integrating sampling, refining and concentration, in particular to a method that can be applied to the separation and enrichment of target substances in complex sample matrices, and through the action of inert gas, can be used for low vapor pressure The target substance can also be obtained by the gas-flow headspace liquid phase microextraction method with a higher enrichment rate. technical background [0002] At present, in order to improve the enrichment rate of target compounds 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. When the sample temperature is increased, the content of the target in the gas phase is increased, and the movement speed of the target is also accelerated, but the temperature of the extraction solvent is al...

Claims

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Application Information

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IPC IPC(8): B01D11/04G01N30/08
Inventor 李东浩杨翠
Owner YANBIAN UNIV
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