A high-efficiency concentrated liquid-liquid microextraction device and method for seamless chromatographic analysis

Abstract

The invention discloses a high-efficiency concentrated solution-liquid micro-extraction device and method capable of seamlessly combining chromatographic analysis. A trace extraction liquid collectionbottle is arranged at the upper end or the lower end of the device, since a micro-extraction bottle is connected through an extraction enrichment device with an opening gradually convergent, a sampleis automatically positioned on an upper layer or a lower layer after extracted and layered, the collecting effect of an extracting solution containing a high-concentration component can be greatly improved through further enrichment by the extraction enrichment device, the concentration and enrichment time of the sample is greatly improved under the condition that the extraction rate is not greatly changed, and the detection limit and the determination limit of sample determination are greatly reduced; and the purpose that a same instrument can be used for measuring trace substances is achieved, the measuring range of the instrument is greatly enlarged, and therefore work of high-grade instruments is completed through low-grade cheap instruments, and trace substances measured through thehigh-grade instruments are measured through low-grade cheap instruments.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and relates to a high-efficiency concentrated liquid-liquid microextraction device and method that can be seamlessly combined with chromatographic analysis. Background technique [0002] Liquid-liquid extraction, also known as solvent extraction or extraction, refers to the separation and extraction of components in a liquid mixture with a solvent; liquid-liquid extraction is one of the most commonly used methods in the pretreatment of analytical and testing samples. The specific process of liquid-liquid extraction is to add an immiscible selected solvent to the liquid mixture, and use the different solubility of its components in the solvent to achieve the purpose of separation or extraction. [0003] In gas chromatographic analysis, generally samples should be processed into organic solvents, not in aqueous solutions; therefore, when testing liquid samples by gas chromatographic analy...

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Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a high-efficiency concentrated liquid-liquid micro-extraction device and method that can be seamlessly combined with chromatographic analysis. , to overcome the defects of the existing liquid-liquid extraction, such as large amount of extractant, serious pollution and waste, low degree of extraction and enrichment, the processed samples can not even reach the detection limit of the instrument, and it is difficult to operate continuously

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