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

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...

AI Technical Summary

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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