Device and method for researching continuous succession rule of soil oxidation-reduction intensity

Abstract

The invention discloses a device and method for researching continuous succession rule of soil oxidation-reduction intensity. The device comprises a container, a pH composite electrode, an inert gas introducing pipe, a gas sampling tube, a suspension sampling tube and an oxidation-reduction composite electrode, wherein the upper end surface of the container is plugged through an opaque organic glass cover. The method comprises the following steps that firstly, soil pretreatment is conducted; secondly, constant-temperature stationary culture is conducted; thirdly, a test time interval is set, and the pH value, the Eh value and the contents of NO2-, Mn2+, Fe2+, SO42- and CH4 are measured; fourthly, the curve of the pH value, the Eh value and the contents of CH4, NO2-, Fe2+, Mn2+ and SO42- along with time changes is draw, and result analysis is conducted. By means of the device and method, chemical behaviors of different oxidation-reduction systems in the continuous succession process that soil changes from the oxidized state, the weak reduction state, the reduced state to the strong reduction state, and the interaction rule of migration and transformation the soil, nutrients, heavy metal, organic pollutants and the like can be researched.

Description

technical field [0001] The invention relates to a device and a method for studying the continuous succession rule of soil redox intensity. Background technique [0002] Existing soil sample collection techniques are only suitable for the collection of dryland soils, and the reducing substances in flooded soils (such as paddy soil, wetland sediments, etc.) are easily oxidized. Test results for reducing substances in samples are highly inaccurate. In addition, the existing soil nutrient and pollutant determination technology requires the soil sample to be air-dried and then measured. Under oxidative conditions, the existing state of nutrients and pollutants in the soil is easily changed, and cannot truly reflect the nutrients in the soil under reducing conditions. Therefore, it is necessary to develop a device and method that can simulate soil redox conditions and study the continuous succession law of soil redox intensity. Contents of the invention [0003] The purpose of...

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Problems solved by technology

[0002] Existing soil sample collection techniques are only suitable for the collection of dryland soils, and the reducing substances in flooded soils (such as paddy soil, wetland sediments, etc.) are easily oxidized. The test results of reducing substances in the sample are extremely inaccurate

In addition, the existing soil nutrient and pollutant determination technology requires the soil sample to be air-dried and then measured. Under oxidative conditions, the existing state of nutrients and pollutants in the soil is easily changed, and cannot truly reflect the nutrients in the soil under reducing conditions. Therefore, it is necessary to develop a device and method that can simulate soil redox conditions and study the continuous succession of soil redox intensity.

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