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DGT adsorption film, preparation method and method for monitoring perfluoro and polyfluoro compounds based on DGT technology

A technology of polyfluorinated compounds and adsorption membranes, applied in the direction of alkali metal compounds, separation methods, chemical instruments and methods, etc., can solve the problems of increased transportation costs and time costs, reduced monitoring accuracy, and cumbersome processing processes, etc., to achieve accurate The effect of monitoring, reducing monitoring costs, and simple operation of the method

Inactive Publication Date: 2020-09-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the prior art, the active sampling method for PFASs exists: 1) the processing process is cumbersome, and it is easy to cause the loss of the analyte, resulting in a decrease in monitoring accuracy; 2) for compounds that exist in trace amounts, a large number of samples need to be collected, which increases transportation costs and time cost flaw

Method used

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  • DGT adsorption film, preparation method and method for monitoring perfluoro and polyfluoro compounds based on DGT technology
  • DGT adsorption film, preparation method and method for monitoring perfluoro and polyfluoro compounds based on DGT technology
  • DGT adsorption film, preparation method and method for monitoring perfluoro and polyfluoro compounds based on DGT technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this example, the WAX ​​resin was used as the raw material to prepare the adsorption film, which was applied to the DGT technology, and the perfluorinated and polyfluorinated compounds existing in the water environment to be tested were determined by using the DGT technology. The specific detection steps are as follows:

[0047] (1) Assembly of the DGT device: first place the DGT base on the clean bench, and spread the WAX ​​resin adsorption film, diffusion film and filter film on the base with clean tweezers in turn, and then gently press the DGT cover on the base by hand , and finally press it tightly to assemble a DGT device (such as figure 1 shown), the base and cover of the DGT device are made of acrylonitrile-butadiene-styrene copolymer (Acrylonitrile butadiene styrene copolymer, ABS), and from top to bottom are filter membrane, diffusion membrane, adsorption membrane .

[0048] (2) Placement of the DGT device: put the DGT device in step (1) into well-stirred ...

Embodiment 2

[0067] In this example, the adsorption membrane distributed with WAX resin prepared in Example 1 was used as the binding membrane of the DGT device, the diffusion membrane was selected from agarose diffusion membrane, and the filter membrane was selected from PES polyethersulfone filter membrane.

[0068] The diffusion film was prepared as follows: before the preparation, the assembled and cleaned glass plates and spacers were placed in an oven at 70°C. Weigh 0.45g of agarose and 30mL of Milli-Q water into a conical flask, place the conical flask on an electric stove to heat, and when the aqueous solution becomes clear and about to boil, transfer the solution to the preheated In the glass plate, after standing at room temperature for 50 minutes, it can be cut into discs with a diameter of 2.51 cm with a mold.

[0069] Use DGT technology to determine the perfluorinated and polyfluorinated compounds in the water to be tested. The specific detection steps are as follows:

[0070...

Embodiment 3

[0089] This example is basically the same as Example 2, except that the difference is that in this example, under different ionic strengths, the DGT technique is used to determine the influence of perfluorinated and polyfluorinated compounds in the water environment, wherein the perfluorinated and polyfluorinated compounds in the water to be tested are The concentration of the fluorine compound is 20 μg / L, and the ionic strength IS (calculated as NaCl) of the aqueous solution to be tested is respectively: 1, 10, 50, 100 and 500 mmol / L.

[0090] image 3 In order to use the DGT device in this embodiment to adsorb various perfluorinated and polyfluorinated compounds under different ionic strengths, the concentration measured by WAX-DGT is basically the same as the solution concentration;

[0091] Such as image 3 As shown, the concentration of perfluorinated and polyfluorinated compounds calculated according to the formula C DGT Compared with the actual measurement of the conc...

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Abstract

The invention belongs to the field of compound monitoring, and discloses a DGT adsorption film, a preparation method and a method for monitoring perfluorinated and polyfluorinated compounds based on aDGT technology. The method comprises the following steps: (1) mixing agar powder, activated WAX resin particles and pure water according to a certain mass ratio, uniformly shaking, and heating untilthe mixture is boiled to be transparent so as to obtain an agarose solution of WAX resin; and (2) preparing an adsorption film by utilizing the agarose solution of the WAX resin, wherein the adsorption film contains WAX resin, and WAX resin particles are uniformly distributed in a film matrix. The perfluoro and polyfluoro compounds are monitored by using a DGT device containing a WAX adsorption film, the adsorption film is eluted by using an eluent to obtain an eluent after the monitoring is finished, and the concentrations of the perfluoro and polyfluoro compounds in the eluent are measured.The method can realize accurate monitoring of perfluoro and polyfluoro compounds, does not need to collect a large number of samples, and significantly reduces the monitoring cost.

Description

technical field [0001] The invention relates to the technical field of gradient diffusion films, more specifically, to a DGT adsorption film, a preparation method and a method for monitoring perfluorinated and polyfluorinated compounds based on DGT technology. Background technique [0002] Per- and polyfluoroalkyl substances (PFASs) are a class of man-made chemical substances containing aliphatic substances with multiple carbon atoms, all of which have a carbon backbone in which the hydrogen atoms are fully (perfluorinated) or partially ( polyfluorine) is substituted by fluorine atoms. Since it was synthesized in the 1940s, due to its excellent thermal stability, high surface activity, and hydrophobic and oleophobic properties, it has been widely used as a surfactant in fire-fighting foams, paints, semiconductors, and non-stick kitchenware coatings , carpets, cosmetics, food packaging, floor wax, photographic film and other industrial and consumer products. PFASs have high...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J20/34G01N30/02G01N30/06G01N30/14G01N30/72
CPCB01J20/26B01J20/28033B01J20/3475G01N30/02G01N30/06G01N30/14G01N30/7233G01N2030/146
Inventor 罗军李渊方舟杨丹幸
Owner NANJING UNIV
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