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Soil nitrate nitrogen real-time detection system and method based on electrochemistry

A real-time detection and electrochemical technology, applied in the direction of material electrochemical variables, measuring devices, scientific instruments, etc., can solve the problem of inability to detect and judge the real supply level of nitrate nitrogen in field soil in time, unable to adapt to crop nutrient management, and unable to realize Precise fertilization and other issues to achieve the effect of improving measurement repeatability and accuracy, reducing labor costs, and low price costs

Pending Publication Date: 2020-12-29
HENAN AGRICULTURAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing conventional measurement methods are photoelectric colorimetric methods. The sample pretreatment process of this method is complicated and time-consuming, and the operation of the instrument requires professionals; In the very short season of crop nutrient management, it is impossible to achieve true precision fertilization

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  • Soil nitrate nitrogen real-time detection system and method based on electrochemistry
  • Soil nitrate nitrogen real-time detection system and method based on electrochemistry
  • Soil nitrate nitrogen real-time detection system and method based on electrochemistry

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Effect test

Embodiment 1

[0044] Embodiment one: a kind of real-time detection system of soil nitrate nitrogen based on electrochemistry, see Figure 1-Figure 3 ,include:

[0045] The sample pretreatment unit is used to process the sample to be tested into a filter suspension, which includes a stirring tank 1 and a stirrer 12 correspondingly arranged in the stirring tank 1, as well as a quantitative water adding mechanism and a quantitative sampler 11. The quantitative water adding mechanism includes a peristaltic pump 13 and a water storage 14, the outlet end of the peristaltic pump 13 is connected to the stirring tank 1 through a corresponding pipeline, and the water inlet end is connected to the water storage 14;

[0046] Filtration unit, used to filter the filtrate suspension transferred from said filtration unit to obtain clear liquid, it includes filter tank 2, filter funnel 18, multi-port peristaltic pump 10 and waste liquid collection container, said multi-port peristaltic pump 10 The suction ...

Embodiment 2

[0049] Embodiment 2: Establishment of a correction model based on temperature transformation

[0050] The ion-selective electrode is immersed in the solution to be tested, and the difference in the activity of the target ions on both sides of the membrane causes ion exchange to form a concentration difference. The membrane potential has a linear relationship with the logarithm of the activity of the target ions in the solution to be tested, which conforms to the Nernst formula E=E 0 ±(2.303RT / zF)*lg(α).

[0051] Because there is the following linear relationship between E and nitrate activity: The nitrate activity is related to the solution temperature, and the regression parameters and temperature at each temperature are sequentially fitted with one-dimensional linear fitting, and the temperature correction model of nitrate ion can be established. Based on the parameters in Table 1, the nitrate ion temperature correction model at 10-35 °C can be obtained as:

[0052]

...

Embodiment 3

[0056] Embodiment three: the soil nitrate nitrogen detection method based on electrochemistry, comprises the following steps:

[0057] Use the quantitative sampler 11 to collect quantitative fresh soil samples and put them into the stirring tank 1 of the detection system described in Example 1, so that the soil samples and water are fully mixed to obtain a suspension; then the peristaltic pump 13 takes the quantitative suspension to filter Pool 2, filter the suspension to retain the clear liquid; the filtered clear liquid is injected into the electrochemical measurement unit by a multi-port peristaltic pump 10, using a nitrate electrode 7, an Ag / AgCl reference electrode 8, a pH electrode 6, and a temperature sensor 9 The signal measured by multi-parameter fusion is transmitted to the data processing module 19, and another nitrate electrode can be redundant, and the error can be reduced through multi-channel comparison; The signal collected by the chemical nitrate nitrogen elec...

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Abstract

The invention relates to a soil nitrate nitrogen real-time detection system and method based on electrochemistry. The detection system comprises a sample pretreatment unit, a filtering unit and an electrochemical measurement unit, wherein the electrochemical measurement unit is composed of a nitrate electrode, an Ag / AgCl reference electrode, a pH electrode, a temperature sensor, a data processingmodule and the like; and a rapid detection method is constructed on the basis of the following detection model. The detection system disclosed by the invention can directly generate specific responseto nitrate ions in a to-be-detected soil solution, is not limited by the color of the solution, shows outstanding advantages in the aspects of usability, cost and robustness of a detection result, andhas the advantages of simple operation method, high response speed, low price cost, no need of complex pretreatment and the like. Measurement errors are reduced from two aspects of software and hardware by adopting a multi-parameter fusion model, sensor multi-channel comparison, turbid liquid filtering and other methods.

Description

technical field [0001] The invention relates to the technical field of soil detection and analysis, in particular to an electrochemical-based real-time detection system and method for soil nitrate nitrogen. Background technique [0002] Soil nitrogen is one of the important nutrients needed for crop growth. The available nitrogen in soil is mainly ammonium nitrogen and nitrate nitrogen in inorganic form, which can be directly absorbed and utilized by crops. Among them, soil nitrate nitrogen is very susceptible to changes due to the influence of ambient temperature, farmland irrigation and precipitation. It directly reflects the short-term nitrogen supply level of the soil and is an important indicator of field nutrient management. Therefore, the rapid determination and monitoring of soil nitrate nitrogen is the first step in precise fertilization and crop nutrient management, which is of great significance. [0003] On the other hand, the content of nitrate nitrogen in the...

Claims

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Application Information

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IPC IPC(8): G01N27/333G01N27/30G01N27/31G01N27/38
CPCG01N27/333G01N27/302G01N27/301G01N27/31G01N27/38
Inventor 苏睿胡建东马刘正李冬贤张燕燕张浩位文涛李灿
Owner HENAN AGRICULTURAL UNIVERSITY
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