Filtering device and application thereof

Abstract

The invention discloses a filtering device and application thereof. The filtering device comprises a sample liquid cavity and a filtering head, wherein the filtering head comprises an upper membrane cover, a filtering membrane and a lower membrane cover; the upper end of the sample liquid cavity is opened; a cavity of a first rolling head is formed in the lower end of the sample liquid cavity; a second rolling head is arranged at the upper end of the upper membrane cover; the second rolling head is embedded with the first rolling head; a third rolling head is arranged at the lower end of the lower membrane cover; the surfaces of the sample liquid cavity, the upper membrane cover and / or the lower membrane cover are made of metals. The filtering device disclosed by the invention is used for detecting a plasticizer in a sample. The invention provides the filtering device made of a metal material, the filtering device is stable in material and not liable to cause interference upon a tested sample, and the reliability of detection results is improved.

Description

technical field [0001] The invention relates to a separating device, in particular to a filtering device and its application. Background technique [0002] When samples (such as vegetables, fruits, etc.) are tested for pesticide residue analysis, a series of pretreatment processes are required, and the pretreatment process mainly includes extraction and separation. Extraction is the operation step of separating the substance to be tested from the sample, and different extraction methods can be selected according to the properties of the substance to be tested. Separation is to purify the complex components extracted from the sample and remove impurities in order to obtain accurate test results. [0003] Adsorption column chromatography is one of the traditional purification methods, and the adsorption columns are generally florisil, alumina and activated carbon columns. Traditional sample purification methods, such as liquid-liquid extraction, often take a lot of time due ...

AI Technical Summary

Problems solved by technology

Traditional sample purification methods, such as liquid-liquid extraction, often take a lot of time due to the need for repeated operations, and at the same time need to use a large amount of organic solvents, such as formaldehyde, acetone, ethanol, etc., causing environmental pollution, and the separated The solution containing the substance to be tested is low in concentration and requires further purification

It can be seen that the traditional separation process takes a long time and is cumbersome. The substance to be tested is prone to changes such as decomposition and degradation during the separation process, and the stability is reduced, which affects the reliability of the test results.

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