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Diffusive gradients in thin films (DGT) method for determination of phosphorus content on the basis of computer-imaging densitometry (CID) technology

A technology of phosphorus content and imaging, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., to achieve the effects of high resolution, improved spatial resolution, and simple operation.

Inactive Publication Date: 2014-09-17
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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Problems solved by technology

[0009] The object of the present invention is to provide a kind of DGT method based on computer imaging densitometry (CID) technology to measure phosphorus content, solve DGT method in phosphorus content measurement, existing technical problem in the mensuration of fixed film surface phosphorus accumulation, overcome existing Some defects in slicing and extraction methods are used to simplify operations, improve measurement efficiency, reduce errors and improve resolution

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  • Diffusive gradients in thin films (DGT) method for determination of phosphorus content on the basis of computer-imaging densitometry (CID) technology
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  • Diffusive gradients in thin films (DGT) method for determination of phosphorus content on the basis of computer-imaging densitometry (CID) technology

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Embodiment Construction

[0039] According to the method of the present invention, the phosphorus fixed film is assembled into a DGT device and put into phosphorus solutions of different concentrations. After 1-2 days, the device is taken out, and the phosphorus fixed film is heat-treated, then colored-scanned, and the gray value of the scanned image is converted into Phosphorus fixes the accumulation of phosphorus on the surface of the film, and calculates the phosphorus content in the phosphorus solution.

[0040] The phosphorus fixed membrane used adopts the improved phosphorus fixed membrane in the patent application 201110325615.8, and its preparation method is as follows: zirconium dioxide powder and acrylamide solution with a water content of 45-55% are mixed in a mass-volume ratio of 1:3 to 1:6 Mix evenly, grind and ultrasonically break, after standing to remove the precipitate, add 1 / 1600~1 / 1400 of the volume of acrylamide solution of tetramethyldiethylamine and 1 / 40~1 / 60 of 10% (wt) Ammonium ...

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Abstract

A DGT (diffusive gradients in thin films) method for determination of phosphorus content on the basis of computer-imaging densitometry (CID) technology is as follows: a ZrO2 phosphorus fixation film is assembled into a DGT (diffusive gradients in thin films) device, the DGT device is put in a phosphorus medium for phosphorus absorption, then the film is put in hot water of 85 DEG C for heat treatment for 5 days to promote further fixation of phosphorus absorbed by the film, the ZrO2 phosphorus fixation film is put in a colorant for coloring, a scanner is used for scanning of the colored film, software is used for converting image color obtained by the scanning into gray scale, and according to an established phosphorus accumulation amount and surface gray scale calibration curve of the ZrO2 phosphorus fixation film, the obtained gray scale is converted into phosphorus accumulation amount; and the phosphorus content in the phosphorus medium can be calculated by use of Fick's first law of diffusion according to the phosphorus accumulation amount in the phosphorus fixation film surface. According to the method, the CID technology is used to avoid slicing, extracting and other operation, and the phosphorus accumulation amount in the phosphorus fixation film, the phosphorus content in the phosphorus medium, spatial distribution and other information and can be quickly and easily obtained.

Description

technical field [0001] The invention relates to a method for measuring and collecting phosphorus content and spatial distribution information in environmental media such as soils and sediments, in particular to a DGT method for determining phosphorus content based on computerized imaging densitometric (CID) technology, which is suitable for thin film diffusion gradients (Diffusive gradients in thin films, DGT) determination of phosphorus accumulation on the surface of fixed film. Background technique [0002] Diffusion gradients in thin films (DGT) measurement technology is a new technology for non-destructive and in-situ acquisition of pollutant distribution and activity in sediments, mainly proposed by Davison and Zhang of Lancaster University in the 1990s. developed in the middle. The technical device is mainly composed of a fixed membrane and a diffusion membrane ( figure 1 ), both of which are configured by gel, where the fixed membrane is configured by adding a fixat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 丁士明朱春刚许笛
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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