Multichannel membrane enrichment device

A multi-channel, membrane enrichment technology, applied in the field of sample pretreatment of analytical chemistry, can solve the problems affecting the repeatability of the membrane enrichment process, poor uniformity of the filter membrane, etc., to achieve convenient number, improve repeatability, and large enrichment efficiency. Effect

Inactive Publication Date: 2014-07-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Experimental program
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Effect test

Embodiment 1

[0042] Using the multi-channel membrane enrichment device of the present invention to enrich, the steps are:

[0043] (1) Place the mixed cellulose enrichment filter membrane 2 with a pore size of 0.22 μm and a diameter of 50 mm on the sand core structure at the upper end of the microporous filter element 4 of the filtrate collection container 3 . The diameter of the sand core structure is 40 mm and the pore size is 20 μm.

[0044] (2) Put the multi-channel input device 1 with 6 holes (7 mm in diameter) on the enrichment filter membrane 2 through the smooth side, and fix it with a magnetic device.

[0045] (3) Use Tris-HCl and NaOH with a pH of 9.0 to adjust the pH of 6 parts of 50 mL divalent cobalt ion solution with a concentration of 1 to 30 μg / L to 9.0, and add 100 uL with a concentration of 10 -3 mol / L PAN, magnetically stirred for 7 minutes to fully react PAN with divalent cobalt ions to obtain a sample solution.

[0046] The sample solution is respectively injected into ...

Embodiment 2

[0050] Using the multi-channel membrane enrichment device of the present invention to enrich, the steps are:

[0051] (1) Put the mixed cellulose enrichment filter membrane 2 with a pore size of 0.1 μm and a diameter of 60 mm on the sand core structure at the upper end of the microporous filter element 4 of the filtrate collection container 3 . The diameter of the sand core structure is 50 mm and the pore size is 10 μm.

[0052] (2) Put the multi-channel input device 1 with 50 holes (3 mm in diameter) on the enrichment filter membrane 2 through the smooth side, and fix it with clips.

[0053] (3) Insert 50 connecting pipes 8 (plastic hoses) connected to the multi-channel input device 1 into 50 parts of 10mL rhodamine B sample solution with a concentration of 1-500μg / L and pH=1.0, and turn on the vacuum pump . Under the action of the vacuum pump, the sample solution is sucked into the multi-channel input device 1 and enters the filtrate container 5 through the enrichment filte...

Embodiment 3

[0057] Using the multi-channel membrane enrichment device of the present invention to enrich, the steps are:

[0058] (1) Put the nylon microporous enrichment filter membrane 2 with a pore size of 0.22 μm and a diameter of 60 mm on the sand core structure at the upper end of the microporous filter element 4 of the filtrate collection container 3. The diameter of the sand core structure is 50 mm and the pore size is 20 μm.

[0059] (2) Put the multi-channel input device 1 with 20 holes (aperture diameter: 5 mm) on the enrichment filter membrane 2 through the smooth side, and fix it with clips.

[0060] (3) Insert 20 connecting pipes 8 (plastic hoses) connected to the multi-channel input device 1 into 20 parts of 10mL 2-naphthalenesulfonic acid sample solution with a concentration of 1-300μg / L and pH=3.5, Turn on the vacuum pump. Under the action of the vacuum pump, the sample solution is sucked into the multi-channel input device 1 and enters the filtrate container 5 through t...

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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...

Claims

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Application Information

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IPC IPC(8): G01N1/40
Inventor 杜一平李炜王蕾童佩瑾张璇张晓芳
Owner EAST CHINA UNIV OF SCI & TECH
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