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Composite membrane for in-situ simultaneous monitoring of labile phosphorus and dissolved oxygen and preparation method thereof

A composite membrane, active phosphorus technology, applied in measurement devices, fluorescence/phosphorescence, instruments, etc., can solve problems that have not been reported in public, and achieve the effect of optimal machinery and high phosphorus adsorption capacity

Active Publication Date: 2016-04-06
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technique of combining DGT and PO to simultaneously measure multiple parameters has not yet been reported publicly.

Method used

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  • Composite membrane for in-situ simultaneous monitoring of labile phosphorus and dissolved oxygen and preparation method thereof
  • Composite membrane for in-situ simultaneous monitoring of labile phosphorus and dissolved oxygen and preparation method thereof
  • Composite membrane for in-situ simultaneous monitoring of labile phosphorus and dissolved oxygen and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A DGT-PO composite membrane for in-situ simultaneous monitoring of active phosphorus and dissolved oxygen and its preparation, using the following methods:

[0029] (1) Take 10mg, 10mg, 500mg of PtOEP dye, fluorescent yellow 10-GN dye and polyethylene particles respectively, dissolve in 10mL of toluene, after ultrasonic dissolution, take 200μL of the mixed solution, and use the method of 100μm scraping film to mix the The solution was uniformly coated on a transparent PET film substrate, and after drying at room temperature for 30 minutes, the fluorescent sensing layer (PO) of the composite film was formed; it was stored in a dark place away from light and sealed until use.

[0030] (2) Prepare submicron ZrO ultrafine particle slurry according to the method described by Kreuzeder, A, etc.; weigh the ultrafine particle slurry containing 8.0g ZrO, and then mix it with 16mL of polyurethane hydrogel HYD4 (polyurethanehydrogel, typeD4, purchased from AdvanSource Biomaterials, U...

Embodiment 2

[0034] Test the DGT-PO composite membrane of the present invention to the fixing performance of phosphorus, carry out according to the following steps:

[0035] (1) Prepare the DGT-PO composite membrane according to Example 1, then place the composite membrane in denitrogenated, ultrapure water for at least 4 hours and set aside for later use.

[0036] (2) The composite membrane treated in step (1) is cut with a stainless steel circular cutter to obtain a composite membrane disc with a diameter of 2.5 cm, and the obtained composite membrane disc and 0.45 μm filter membrane are stacked in sequence and assembled into a DGT device.

[0037] (3) Put the DGT device assembled in step (2) into deionized water and perform nitrogen filling for 12 hours to remove oxygen (to exclude the influence of DO on the PO layer).

[0038] (4) Put the DGT device in step (3) into 1mg / L phosphate-containing mother liquor (pH=7.0±0.2; 0.03MNaCl)), place 2, 4, 6, 8, 12, 16, 22 , After 24 hours, the a...

Embodiment 3

[0040] Test the DGT-PO composite membrane of the present invention to the fixed capacity of phosphorus, concrete steps are as follows:

[0041] (1) The composite membrane disc obtained in step (2) in Example 2 was put into deionized water, and inflated with pure nitrogen for 12 hours to remove the oxygen in the membrane, and set aside.

[0042] (2) The obtained composite membrane disc and the 0.45 μm filter membrane are sequentially stacked and then assembled into a DGT device.

[0043] (3) Put the DGT device assembled in step (2) into 8 different phosphate-containing mother solutions of 0.5-10mg / L (0.001mgP / L-20mgP / L, pH=7.0±0.2; 0.03MNaCl) , for 6h adsorption, and each group had 3 parallel samples.

[0044] (4) After the adsorption is completed, take out the DGT device, recover the composite membrane, then rinse with ultrapure water and put it into 5mL 1.0M NaOH solution for 24h to fully extract, and then use microcolorimetry to measure the phosphorus concentration in the e...

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Abstract

The invention discloses a DGT-PO composite membrane for in-situ simultaneous monitoring of labile phosphorus and dissolved oxygen. The composite membrane is characterized by comprising a transparent supporting body, a fluorescence sensing layer and a DGT fixing layer; the fluorescence sensing layer is obtained by uniformly mixing fluorochrome octaethyl porphilin platinum and fluorescein 10-GN, and fixing the two fluorochromes to the surface of a transparent supporting body through chemical embedding; the DGT fixing layer adopts submicron ZrO particles as a fixing agent and adopts polyurethane as a matrix, and the DGT fixing layer is obtained on the fluorescence sensing layer through a coating method. According to the composite membrane, on the basis of a slab photoelectrode and a film diffusion gradient principle, two channels are adopted for obtaining DO and SRP information, and SRP fixation and DO induction in the matrix such as water or sediments or soil or the like can be achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and relates to a sensing film for monitoring active substances in substrates such as water bodies, sediments or soils, and in particular to an in-situ synchronous monitoring of active phosphorus and dissolved oxygen based on thin film diffusion gradient technology and flat photoelectrode technology Composite film and its preparation method. Background technique [0002] Sediments and soils have very significant spatial heterogeneity, and there are biological activities such as various microorganisms, plant rhizosphere, and animals in their interior and micro-interface environment, physical disturbances such as water flow, wind waves, rainfall runoff, air exchange, and various Redox reactions, organic matter degradation, early diagenesis and other chemical reactions. These biological, physical and chemical processes will lead to strong gradient changes at the interface between se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402G01N21/643G01N2021/6432
Inventor 韩超丁士明
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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