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Method for determining two-dimensional distribution of available phosphorus content

A technology of two-dimensional distribution and effective state, applied in measurement devices, analysis materials, material analysis by optical means, etc., can solve problems such as inability to obtain two-dimensional distribution accurately, save testing costs, save chemical reagents, and have The effect of promoting the application

Pending Publication Date: 2020-08-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] From the above analysis, it can be seen that the existing technical means cannot conveniently, quickly and accurately obtain the two-dimensional distribution of the available phosphorus content in the soil.

Method used

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  • Method for determining two-dimensional distribution of available phosphorus content
  • Method for determining two-dimensional distribution of available phosphorus content
  • Method for determining two-dimensional distribution of available phosphorus content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for measuring the two-dimensional distribution of available phosphorus content in this embodiment, the specific steps are:

[0042] (1) Phosphorus absorption: A columnar sediment sample with overlying water was collected from a lake, and a strip-shaped DGT device assembled with a precipitated zirconia adsorption film was placed in the sediment medium, so that the window of the DGT device was completely Exposure to sediment, the preparation method of precipitated zirconia adsorption film refers to patent ZL201510780858.9 and literature Guan, D.X., Williams, P.N., Luo, J., Zheng, J.L., Xu, H.C., Cai, C. and Ma, L.Q. [Author], Novel precipitated zirconia-based DGT technique for high-resolution imaging of oxyanions inwaters and sediments [Thesis title], Environmental Science&Technology [Journal name], 2015, 49(6): 3653-3661 [Publication year, volume (issue) : page number], during the experiment, the indoor temperature was controlled at 25±2°C, and the DGT device wa...

Embodiment 2

[0061] A method for measuring the two-dimensional distribution of available phosphorus content in this embodiment, the specific steps are:

[0062] (1) Phosphorus absorption: A columnar soil sample with overlying water was collected from a paddy field, and a strip-shaped DGT device assembled with a precipitated zirconia adsorption film was placed in the soil medium. The preparation method of the precipitated zirconia adsorption film See patent ZL201510780858.9. During the experiment, the indoor temperature was controlled at 25±2°C. After 12 hours of storage, the DGT device was recovered, and the precipitated zirconia adsorption film was taken out to obtain a precipitated zirconia adsorption film with a size of 8.6cm (length)×1.8cm (width)×0.04cm (thickness).

[0063] (2) Color development of the adsorption film: soak the precipitated zirconia adsorption film in the color developer, the volume of the color developer is 41mL, the volume ratio of the color developer to the adsorp...

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Abstract

The invention relates to a method for determining the two-dimensional distribution of available phosphorus content. A DGT device assembled with a precipitated adsorption film into a sediment or soil medium to absorb available phosphorus in the longitudinal section of the medium; the precipitated adsorption film in the DGT device is taken out, is soaked in a color developing agent so as to be subjected to a color developing reaction; the surface gray value of the precipitated adsorption film is obtained by using a CID method; according to the established standard curve of the phosphorus adsorption capacity per unit surface area of the precipitated adsorption film and the gray value, the gray value is converted into a phosphorus adsorption capacity; and the two-dimensional distribution of the available phosphorus content in the sediment or the soil medium is calculated through a formula; the precipitated zirconium oxide adsorption film with high adsorption capacity is used for representing phosphorus, so that the method is suitable for being applied to various environment scenes of phosphorus deficiency, phosphorus application and the like, particularly under the condition of strongphosphorus content spatial distribution heterogeneity; the front and back surfaces of the adsorption film do not need to be distinguished when the adsorption film is used for loading different amountsof phosphorus to prepare mark lines; and only the adsorption film is used instead of the complete DGT device, so that operation complexity is avoided.

Description

technical field [0001] The invention belongs to the technical field of element bioavailability and spatial distribution characterization, and specifically relates to a method for measuring the two-dimensional distribution of available phosphorus content. Background technique [0002] The average phosphorus content in the earth's surface soil is only about 80% of that in the earth's crust, resulting in the soil often lacking phosphorus, which is not enough to maintain the necessary phosphorus supply for crop organisms. Soil phosphorus application is a common agronomic practice, and the applied phosphorus usually comes from phosphate rock in the earth's crust. On the one hand, phosphate rock is a non-renewable resource. On the other hand, in order to ensure sufficient phosphorus supply for crops, excess phosphorus fertilizer is applied to the soil. Excess phosphorus will enter the surrounding water body through surface runoff, which may cause eutrophication of the water body. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/82G01N21/84
CPCG01N21/78G01N21/82G01N21/84
Inventor 管冬兴李希媛滕辉
Owner TIANJIN UNIV
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