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Method for in-situ synchronous acquisition of two-dimensional distribution of active phosphor and dissolved oxygen in water, soil or sediment

A synchronous acquisition and two-dimensional distribution technology, applied in the fields of environmental science and earth science, can solve the problems of high detection cost and unfavorable electrode popularization, achieve high fluorescence brightness, eliminate external interference, and low cost

Active Publication Date: 2016-05-04
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the fluorescence intensity quantification method is one of the simplest and most common methods for planar photoelectrode detection, but there are many factors such as optical path, background light, photobleaching and photostability in single fluorescence intensity quantification.
The fluorescence lifetime quantitative method is not affected by the sensing film itself and the external environment, and can provide more accurate and scientific material distribution information. However, this method strongly relies on advanced and sophisticated hardware and software equipment, so the detection cost is high, which is not conducive to this method. The popularity of electrodes

Method used

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  • Method for in-situ synchronous acquisition of two-dimensional distribution of active phosphor and dissolved oxygen in water, soil or sediment
  • Method for in-situ synchronous acquisition of two-dimensional distribution of active phosphor and dissolved oxygen in water, soil or sediment
  • Method for in-situ synchronous acquisition of two-dimensional distribution of active phosphor and dissolved oxygen in water, soil or sediment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The DGT-PO composite membrane used in the present invention to simultaneously monitor active phosphorus and dissolved oxygen in situ is prepared by the following method:

[0041] (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.

[0042] (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 polyurethane hydrogel HYD4 (polyurethanehydrogel, typeD4, purchased from AdvanSource Biomate...

Embodiment 2

[0046] The fixed capacity test of DGT-PO composite membrane to phosphorus, the specific steps are as follows:

[0047] (1) Slice the prepared DGT-PO composite membrane with a circular stainless steel knife (2.0 cm in diameter) to obtain a disc, put it in deionized water, inflate it with pure nitrogen for 12 hours, remove the oxygen in the membrane, and set aside.

[0048] (2) Assemble the prepared DGT-PO composite membrane into a piston-type DGT device, and then place the assembled device in denitrogenated and ultrapure water for at least 4 hours for hydration.

[0049] (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.

[0050] (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 ex...

Embodiment 3

[0053] The influence of DGT-PO composite membrane pickling-heating pretreatment on the recovery efficiency of composite membrane immobilized phosphorus is carried out according to the following steps:

[0054] (1) After fully hydrating the DGT-PO composite membrane prepared in Example 1 for 4 hours, slice it with a stainless steel circular blade with a radius of 1 cm, and then assemble the piston-type DGT device.

[0055] (2) Put the DGT device assembled in (1) into different phosphate-containing mother liquors (pH=7.0±0.2; 0.03MNaCl)), after the adsorption is completed, the DGT-PO composite membrane in the recovered device was Pickling (0.1M dilute nitric acid) for 24 hours and water washing for 4 hours, after heating, extract with 1.0M NaOH, and the other group is directly extracted with 1.0M NaOH. Figure 4 . The results show that the recovery rate of phosphorus in the composite membrane by pickling, water washing and heating is between (96.50±0.26)% and (103.92±1.91)%, in...

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Abstract

The invention discloses a method for in-situ synchronous acquisition of two-dimensional distribution of active phosphor and dissolved oxygen in water, soil or sediment. The method utilizes a DGT device comprising a DGT-PO functional composite membrane. The DGT-PO functional composite membrane comprises a transparent support, a fluorescent sensing layer and a DGT fixed layer. The method comprises 1, based on a fluorescence analysis principle, acquiring a DO fluorescence intensity image of a composite membrane PO layer in real time through an image technology, and 2, treating the composite membrane, carrying out membrane color development, acquiring a SRP developing image of the DGT layer through a computer-generated imagery density measurement technology and carrying out metering and detection on the SRP and DO according to the acquired image. Through use of an improved membrane developing-computer-generated imagery technology and a RGB three-color rate quantification technology, active phosphor and dissolved oxygen in a matrix can be synchronously monitored in real time through DGT-PO double channels.

Description

technical field [0001] The invention belongs to the fields of environmental science and earth science, and relates to a method for synchronously monitoring the distribution information of two important geochemical parameters in substrates such as water body, sediment or wetland soil, and specifically relates to a technology based on film diffusion gradient balance and planar photoelectrode A method to obtain information on the distribution of reactive phosphorus (SRP) and dissolved oxygen (DO) simultaneously in situ. Background technique [0002] Phosphorus is one of the nutrient limiting factors of eutrophication in most lakes in my country. In recent years, although the exogenous input of phosphorus has been effectively curbed, the problem of endogenous phosphorus pollution in lakes has become increasingly serious, resulting in frequent occurrence of lake eutrophication. Sediment redox process controls phosphorus release, that is, "anaerobic conditions promote phosphorus ...

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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