A kind of dispersion liquid-liquid microextraction device and method

Abstract

The invention discloses a dispersion-liquid micro-extraction device and method. The extraction device comprises a conical glass tube, an injection piston, a valve body and a buckle; the conical glass tube is made of transparent glass, and the conical glass tube One end of the conical glass tube is set as a thick mouth, and the other end is set as a thin mouth, and the volume of the conical glass tube is 10-20mL; the thin end of the conical glass tube has a scale, which is used to accurately quantify the extraction solution entering the narrow mouth. The device for dispersion liquid-liquid extraction provided by the present invention can use solvents with a lower density than water, such as alkanes, ethers and alcohols, as extraction agents, which overcomes the shortcomings of the prior art extraction agent selection range and high toxicity, and expands the range of extraction agents. Select the type; this device can quickly and accurately quantify the extractant containing the target substance, reducing operational errors; the micro-syringe is convenient for sampling and easy to operate; the volume of water samples can be freely selected, and the injection piston can push water samples of different volumes to The thin mouth of the tapered glass tube.

Description

technical field [0001] The invention belongs to the technical field of microextraction, and more specifically relates to a dispersion liquid-liquid microextraction device and method. Background technique [0002] Dispersive liquid-liquid microextraction (DLLME) is a liquid-phase microextraction method first proposed by Assadi et al. Its basic principle is to extract and enrich the analyte through the distribution between the aqueous phase and the organic phase. The special feature of this method is to use a water-soluble dispersant to uniformly disperse the water-insoluble extractant in the water sample to form fine droplets, increasing the contact between the analyte and the extractant droplets. area, so that the extraction can quickly reach equilibrium, and has the advantages of simple operation, high enrichment factor, fast speed, and less organic solvent consumption. This method has been successfully used to analyze various organic pollutants in water samples, such as b...

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Problems solved by technology

[0003] But there are some shortcomings in the described dispersion liquid-liquid microextraction application: (1) dispersion liquid-liquid microextraction generally requires extractant to be deposited on the bottom of test tube after extracting target object, and the extraction liquid at the bottom is taken out with microsyringe, therefore The density of the extraction solvent is required to be greater than that of water, which limits the choice of extraction agent

Currently commonly used extraction agents are halogenated hydrocarbons such as halobenzene, carbon tetrachloride, dichloroethylene, chloroform, tetrachloroethylene, etc. These reagents are generally highly toxic and have certain requirements for detection mass spectrometry equipment; (2) In order to accurately quantify the target contamination, it is necessary to accurately quantify the volume of the extractant. The existing operation is to use a micro-syringe to easily take out the extract at the bottom of the test tube for quantification, which is inconvenient to operate and prone to errors.

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