Method for detecting soil Eh change based on DGT technology

Abstract

The invention relates to a method for detecting soil Eh change based on a DGT technology, and provides a method for tracking and monitoring Eh change of flooded soil in situ based on a gradient diffusion thin film (DGT) technology. The method comprises the following steps: determining the concentration CDGT-Fe of ferrous ions in soil by utilizing a DGT simple membrane, and establishing an index coupling relationship model between the concentration CDGT-Fe of ferrous ions in soil and soil Eh; then measuring the two-dimensional plane CDGT-Fe of the soil to be measured; reversely deducing the change of the to-be-measured soil Eh in a two-dimensional plane according to the CDGT-Fe-Eh coupling relationship; taking an Eh value coupling model as an exponential model by utilizing a simple membraneto calibrate different soil types; and using the intrinsic correlation between iron (Fe) with different valence states and the soil redox potential (Eh) to establish the determination method for effectively evaluating the soil Eh change so that the dynamic change condition of the soil Eh is determined at low cost and high resolution in situ, and the technical problems that the Eh electrode is high in Eh determination cost and long in determination time, and only detection points can be determined are solved.

Description

technical field [0001] The invention belongs to the field of in-situ monitoring of soil physical and chemical properties, and relates to a method for in-situ monitoring of soil Eh changes on a two-dimensional plane, based on the principle of gradient diffusion film technology (Diffusive gradients in thin films), with simple coordination The treatment method, the Fe extracted in situ by DTPA-LDHs-DGT 2+ concentration and the Eh value of the corresponding soil to establish the soil Fe 2+ The model is coupled with the Eh value so that the C can be extracted in situ by the 2D planar DTPA-LDHs-DGT DGT-Fe The change of the corresponding soil Eh on the soil two-dimensional plane can be easily obtained. Background technique [0002] Redox status is one of the important physical and chemical properties of soil. Changes in redox status can lead to the transformation, migration and accumulation of organic and inorganic substances in soil, and become an indispensable chemical power in...

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Problems solved by technology

[0004] However, the current Eh in situ detection equipment is expensive and inconvenient to carry

Most of the equipment uses platinum electrodes for detection, which cannot meet the requirements of batch detection, and may be difficult to popularize for general laboratories

The production of portable soil redox potential meter provides a technical method for in-situ detection of soil point Eh. However, due to the difference in soil environment, soil at different depths is affected by soil redox properties to different degrees. Portable soil redox potential meter is used in practice. Multi-point detection cannot be realized during use, and the detection results often cannot explain the true redox degree of the soil

[0005] By searching the existing published patent documents, no published patent documents identical to the present invention have been found

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