Multichannel membrane enrichment device

Abstract

The invention relates to a multichannel membrane enrichment device comprising a multichannel input unit, an enrichment filter membrane and a filter liquor collection container, wherein the multichannel input unit is a wafer with holes and at least one smooth face and in butt joint with the enrichment filter membrane by the smooth face; connection pipelines are arranged on the holes in the other face of the multichannel input unit for inputting a sample solution; the filter liquor collection container is arranged below the enrichment filter membrane; the filter liquor collection container comprises a micropore filter core and a filter liquor container; the lower end of the micropore filter core is connected with the opening end of the filter liquor container by a rubber plug; the filter liquor container is provided with a vacuum pump connection hole. By utilizing the multichannel membrane enrichment device, a plurality of samples can be treated on the same filter membrane simultaneously or according to a certain order to improve repeatability of enrichment process. Filter hole diameter can be changed according to needs, and the enrichment efficiency is high under the condition that the samples are the same in size. By utilizing the multichannel membrane enrichment device, multichannel simultaneous enrichment can be realized, enrichment process can be accelerated, batch operation is easy to realize, different number of channels can be selectively used, and the number of the samples is easy to control.

Description

technical field [0001] The invention mainly relates to the field of sample pretreatment of analytical chemistry. Specifically, it is a multi-channel membrane enrichment device. Background technique [0002] The membrane separation process is a method of separating mixtures using thin films. As a selectively permeable phase between two phases, the membrane can allow one or more components of the two phases to pass through the membrane, while intercepting other components, so as to realize the separation between different components and achieve a certain Or the purpose of separation, concentration and purification of multiple components. Different membrane separation processes can have different separation mechanisms and driving forces. Membrane filtration is one of them, which is mainly a screening and separation process that uses fluid pressure difference as the driving force. [0003] Membrane enrichment technology is a solid phase extraction technology based on membran...

AI Technical Summary

Problems solved by technology

However, its disadvantage is: due to the design and specification limitations of commercial solvent filters, a filter membrane can only process one sample solution at the same time, and the diameter of the sand core of a conventional solvent filter is usually 30mm, 40mm, 50mm. The enrichment efficiency can only enrich larger volume samples

In addition, the properties of the filter membrane itself, such as type, pore size, thickness, and uniformity, have a great influence on the enrichment process and subsequent detection process

At present, most of the commercially available filter membranes have the problem of poor uniformity.

Membranes produced by different batches of different manufacturers, different membranes of the same batch, or even different positions of the same membrane may have different pore diameters and thicknesses, which will seriously affect the repeatability of the membrane enrichment process.

The influence caused by the difference of the film itself is particularly serious when the diffuse reflectance spectrum of the film is collected directly for spectroscopic analysis

However, in the actual use of the filter membrane, there is currently no standard or better method for selecting the filter membrane.

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