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Phosphorus fixing film applied to diffusive gradients in thin-films measurement technology

A thin film diffusion gradient and fixed film technology, which is applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problem of insufficient phosphorus fixation capacity, and achieve superior strength and stretch performance, not easy to break, and high adsorption capacity Effect

Inactive Publication Date: 2010-01-20
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a phosphorus immobilized membrane applied to the thin film diffusion gradient measurement technology. question

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  • Phosphorus fixing film applied to diffusive gradients in thin-films measurement technology
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  • Phosphorus fixing film applied to diffusive gradients in thin-films measurement technology

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Embodiment Construction

[0019] see figure 1 , The DGT measurement technology device is composed of a fixed membrane and a diffusion membrane. The ions pass through the diffusion membrane in a diffusion manner, and then are captured by the fixed membrane, and form a linear gradient distribution on the diffusion membrane.

[0020] see figure 2 , it can be seen from the figure that the adsorption capacity of zirconium dioxide membranes with different water contents to phosphate radicals is significantly different. The adsorption capacity of the zirconia membrane with a rate of 50% is the largest among the three.

[0021] see image 3 , it can be seen from the figure that the adsorption capacity of the zirconium film is significantly higher than that of the iron film no matter what the pH conditions are. The pH in natural water or soil solution is generally between 5 and 9 (shaded part). In this pH range, the adsorption capacity of the zirconium film is at least 4 times higher than that of the iron ...

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Abstract

The invention relates to a phosphorus fixing film applied to diffusive gradients in thin-films measurement technology. A fixing film and dispersion film superposed structure is arranged in the diffusive gradients in thin-films measurement technology, ions pass through a dispersion film in a dispersion way and is captured by a fixing film immediately to form the linear gradient distribution on the dispersion film. The phosphorus fixing film capturing phosphorus ions is characterized by using zirconium dioxide powder and acrylamide as raw materials, the raw materials are uniformly mixed to form mixed solution according to the weight volume ratio of 1:1.5-1:4, the mixed solution is slowly infused into a clearance of two glass plates clamping a u-shaped plastic sheet, the glass plates are placed for 2-4h horizontally at lower temperature of 10-15 DEG C after bubbles are removed, the temperature is risen to 30-35 DEG C after the zirconium dioxide powder is freely settled so as to enable the mixed solution to be gelated to form a film, the film has higher absorption capacity ratio to phosphate radicals than the prior iron film material by at least 4 times under the condition that the pH value is 5-9, so the analysis requirement of the DGT technology to phosphorus in different environment media is completely met.

Description

technical field [0001] The invention relates to the analysis and evaluation of the migration activity, bioavailability, pollution risk, etc. of phosphorus in environmental media such as soil and sediment, especially a phosphorus immobilized membrane applied to the thin film diffusion gradient measurement technology. Background technique [0002] Diffusive Gradients in Thin Films (DGT) measurement technology is a new speciation analysis technology, which was mainly developed by Davison and Zhang of Lancaster University in the mid-1990s. Based on the principle of diffusion, this technology obtains the activity information of ions in the medium through the gradient diffusion of target ions in the defined diffusion layer and the study of related processes. The DGT measurement technology device is composed of a fixed membrane and a diffusion membrane ( figure 1 ), the ions pass through the diffusion membrane in the form of diffusion, and are captured by the fixed membrane immedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/25
Inventor 许笛丁士明
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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