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Improved phosphorus fixing film used in DGT (diffusive gradients in thin films) measurement and preparation method thereof

A thin film diffusion gradient and fixed film technology, applied in the MS field, can solve the problems of large fixative particles, unable to meet the requirements of high-resolution analysis, uneven distribution, etc., and achieve the effects of uniform particle distribution, excellent physical strength, and low stretchability.

Inactive Publication Date: 2012-06-20
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fixative particles on the surface of the fixed film are large and unevenly distributed, which cannot meet the high-resolution analysis requirements of DGT for sediment phosphorus.

Method used

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  • Improved phosphorus fixing film used in DGT (diffusive gradients in thin films) measurement and preparation method thereof
  • Improved phosphorus fixing film used in DGT (diffusive gradients in thin films) measurement and preparation method thereof
  • Improved phosphorus fixing film used in DGT (diffusive gradients in thin films) measurement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An improved phosphorus immobilized membrane in the determination of thin film diffusion gradients, the preparation method of which is as follows:

[0029]Weigh 25g of zirconium oxychloride and dissolve it in 600ml of deionized water, then use 25% (volume ratio) ammonia water to adjust the pH of the solution and stabilize it between 6.9-7.1, and wash the resulting precipitate with deionized water for 8-9 times , and finally use a hair dryer to dry its moisture content to between 45 and 55%. Mix 1.8g of prepared zirconium dioxide powder with 7.2ml of acrylamide solution (aqueous solution of 28.5% acrylamide and 1.5% methacrylamide) at a mass volume ratio of 1:4, and grind it with an agate mortar for 10 to 30 minutes. Then use a cell disruptor to sonicate at 20% frequency for 5 to 15 minutes, let it stand for 10 to 30 minutes, remove the precipitate, and then add 4.5 μL of tetramethyldiethylamine (TEMED) and 180 μL of ammonium persulfate solution to the solution (mass rat...

Embodiment 2

[0033] An improved phosphorus immobilized membrane in the determination of thin film diffusion gradients, the preparation method of which is as follows:

[0034] Weigh 25g of zirconium oxychloride and dissolve it in 600ml of deionized water, then use 25% (volume ratio) ammonia water to adjust the pH of the solution and stabilize it between 6.9-7.1, and wash the resulting precipitate with deionized water for 8-9 times , and finally use a hair dryer to dry its moisture content to between 45 and 55%. Mix 1.45g of prepared zirconium dioxide powder with 7.2ml of acrylamide solution (aqueous solution of 28.5% acrylamide and 1.5% methacrylamide) at a mass volume ratio of 1:5, and grind it with an agate mortar for 10 to 30 minutes. Then use a cell disruptor to sonicate at 20% frequency for 5 to 15 minutes, let it stand for 10 to 30 minutes, remove the precipitate, and then add 5.1 μL of tetramethyldiethylamine (TEMED) and 120 μL of ammonium persulfate solution to the solution (mass r...

Embodiment 3

[0036] Example 3, an improved phosphorus immobilized membrane in the determination of a thin film diffusion gradient, its preparation method is basically the same as that of Example 1,

[0037] The difference is that the acrylamide solution is a 35.0% acrylamide aqueous solution.

[0038]

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Abstract

The invention provides an improved phosphorus fixing film used in DGT (diffusive gradients in thin films) measurement. The improved phosphorus fixing film is a polyacrylamide gel film containing zirconium dioxide (ZrO2) and is characterized in that ZrO2 particles of which the particle size is less than or equal to 5mu m are uniformly distributed on the surface of the phosphorus fixing film. A preparation method of the improved phosphorus fixing film comprises the following steps: uniformly mixing ZrO2 powder with the moisture content of 45-55% with an acrylamide solution at the weightmeasurement ratio of (1:3)-(1:6); grinding and then carrying out ultrasonication; standing for removing precipitates, adding tetramethylethylenediamine of which the volume is (1:1600)- (1:1400) of that of acrylamide and a 10% ammonium persulfate solution of which the volume is (1:60)-(1:40) of that of acrylamide, uniformly mixing and injecting into a glass mold; horizontally placing the glass mold at room temperature; After the zirconium powder is freely precipitated, raising the temperature to 40-60DEG C until the mixed solution forms a gel film; and soaking in de-ionized water for more than 12 hours, thus obtaining the phosphorus fixing film. The phosphorus fixing film provided by the invention can be used for maintaining high phosphorus ion adsorption capacity and simultaneously improving the resolution ratio of DGT in phosphorus analysis.

Description

technical field [0001] The invention relates to a fixed film and its preparation method used in the analysis and evaluation of environmental media such as soil and sediment, and is suitable for thin film diffusion gradients (DGT). Determination technology An improved phosphorus immobilized film for analyzing sediment phosphorus and its preparation method. Background technique [0002] Phosphorus is an important nutrient element for the growth of aquatic organisms, and it is also the main limiting factor of lake primary productivity and water eutrophication. After exogenous phosphorus enters the lake water body, most of it accumulates in the sediment, and is re-released into the overlying water under certain conditions to maintain the eutrophic state of the water body. The release potential of sediment phosphorus is closely related to its distribution at the sediment-water micro-interface. Usually, due to the huge difference in the physical, chemical and biological properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
Inventor 孙琴丁士明许笛
Owner HOHAI UNIV
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