CN214150541U - Soil nitrate nitrogen real-time detection system based on electrochemistry - Google Patents
Soil nitrate nitrogen real-time detection system based on electrochemistry Download PDFInfo
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- CN214150541U CN214150541U CN202022054603.3U CN202022054603U CN214150541U CN 214150541 U CN214150541 U CN 214150541U CN 202022054603 U CN202022054603 U CN 202022054603U CN 214150541 U CN214150541 U CN 214150541U
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Abstract
The utility model relates to a soil nitrate nitrogen real-time detection system based on electrochemistry. The detection system comprises a sample pretreatment unit, a filtering unit and an electrochemical measurement unit which is composed of a nitrate electrode, an Ag/AgCl reference electrode, a pH electrode, a temperature sensor, a data processing module and the like. The detection system of the utility model can directly generate specific response to nitrate ions in the soil solution to be detected, is not limited by the solution color, has outstanding advantages in the aspects of usability, cost and robustness of detection results, and has the advantages of simple operation method, high response speed, low price cost, no need of complex pretreatment and the like; the utility model discloses a sensor multichannel contrast and methods such as turbid liquid filtration reduce measuring error from aspects such as hardware.
Description
Technical Field
The utility model relates to a soil detection and analysis technical field, concretely relates to soil nitrate nitrogen real-time detection system based on electrochemistry.
Background
Soil nitrogen is one of the important nutrient elements required for crop growth. The available nitrogen in the soil is mainly inorganic ammonium nitrogen and nitrate nitrogen, and is nitrogen which can be directly absorbed and utilized by crops, wherein the soil nitrate nitrogen is extremely easy to change under the influence of environmental temperature, farmland irrigation and precipitation, directly reflects the short-term nitrogen supply level of the soil, and is an important index for field nutrient management. Therefore, the rapid determination and monitoring of soil nitrate nitrogen is the first link of accurate fertilization and crop nutrient management, and has very important significance.
On the other hand, the content of nitrate nitrogen in soil is the main basis for estimating the application amount of the current-season nitrogen fertilizer of crops and diagnosing the topdressing in the growth period. Most of the existing conventional measurement methods are photoelectric colorimetric methods, the sample pretreatment process is complex and time-consuming, and professional personnel are required for operating and using the instrument; therefore, the real supply level of nitrate nitrogen in the field soil cannot be detected and judged in time, the method cannot adapt to very short time of crop nutrient management, and real accurate fertilization cannot be realized.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a soil nitrate nitrogen real-time detection system based on electrochemistry that system error is controllable, operation use is simple and convenient (degree of automation is high).
In order to solve the technical problem, the utility model adopts the following technical scheme:
designing a soil nitrate nitrogen real-time detection system based on electrochemistry, comprising:
the sample pretreatment unit comprises a stirring pool and a stirrer correspondingly arranged in the stirring pool, and is used for treating a sample to be detected into a filter suspension;
the filtering unit comprises a filtering tank and a filtering funnel and is used for filtering the filtered suspension from the filtering unit so as to obtain clear liquid;
the electrochemical measurement unit comprises a detection pool, a nitrate radical electrode, an Ag/AgCl reference electrode, a pH electrode and a temperature sensor, wherein the nitrate radical electrode, the Ag/AgCl reference electrode, the pH electrode and the temperature sensor are used for collecting electric signals of a solution to be measured from the detection pool, and a data processing module is used for processing the electric signals; the solution to be measured is derived from the quantitative transfer of the filtration unit.
The electrochemical ion selective electrode selected by the invention can generate specific potential response to specific ions, can directly generate specific response to nitrate ions in the soil solution to be detected, is not limited by the solution color, has outstanding advantages in the aspects of usability, cost and robustness of detection results, has the advantages of simple operation method, high response speed, low price cost and the like, and provides a good hardware basis for real-time on-site measurement of the nitrate nitrogen content in the soil.
The sample pretreatment unit further comprises a quantitative water adding mechanism and a quantitative sampler, wherein the quantitative water adding mechanism comprises a peristaltic pump and a water storage device, the water outlet end of the peristaltic pump is communicated to the stirring pool through a corresponding pipeline, and the water inlet end of the peristaltic pump is communicated to the water storage device.
The filter unit also comprises a multi-port peristaltic pump and a waste liquid collecting container, wherein a turbid liquid suction end of the multi-port peristaltic pump is communicated with the stirring tank, a clear liquid suction end of the multi-port peristaltic pump is communicated with the filter tank through a pipeline, a waste liquid suction end of the multi-port peristaltic pump is communicated with the filter funnel through a pipeline, a clear liquid outlet end of the multi-port peristaltic pump is communicated with the detection tank, and a waste liquid outlet end of the multi-port peristaltic pump is communicated with the waste liquid collecting container.
Signals collected by nitrate radical electrodes in the electrochemical measuring unit are processed by the corresponding impedance matching, voltage-stabilizing filtering and amplifying module, the AD conversion module and the microprocessor and then output to corresponding output ends.
The electrochemical measurement unit redundantly has at least one nitrate electrode to reduce errors through multi-channel contrast.
The soil nitrate nitrogen real-time detection system also comprises a cleaning and purging mechanism which is composed of a cleaning water source, a compressed inert gas source, a control valve and pipelines respectively communicated to the sample pretreatment unit, the filtering unit and the electrochemical measuring unit.
Compared with the prior art, the utility model discloses a main beneficial technological effect lies in:
1. the utility model discloses electrochemical ion selective electrode among the detecting system can produce the specific potential response to specific ion, can directly produce the specific response to the nitrate ion in the soil solution that awaits measuring, does not receive the restriction of solution colour to show outstanding advantage in the aspect of the robustness of usability, cost and testing result, have that operating method is simple, response speed is fast, the price cost is low and need not advantages such as complicated pretreatment.
2. In order to eliminate various interference errors in the process of measuring by using the electrodes, the utility model adopts methods of multi-channel comparison of the sensor, turbid liquid filtration and the like, and the measurement errors are reduced to the maximum extent from the aspect of hardware.
3. The utility model discloses designed simultaneously and realized full-automatic mobile washing integrated device, weaken the cost of labor to the minimum, improved the measurement repeatability and the accuracy of electrochemistry soil nitrate nitrogen electrode greatly.
Drawings
Fig. 1 is a schematic diagram of the principle structure of the detection system of the present invention.
Fig. 2 is the schematic view of the signal acquisition and processing flow of the detection system of the present invention.
Fig. 3 is a schematic diagram of the structure of the conditioning circuit of the detection system of the present invention.
In the above figures, 1 is a stirring tank, 2 is a filtering tank, 3 is a tee joint, 4 is a waste liquid collecting container, 5 is a detection tank, 6 is a pH electrode, 7 is a nitrate electrode, 8 is Ag/AgCl, 9 is a temperature sensor, 10 is a multi-port peristaltic pump, 11 is a quantitative sampler, 12 is a stirrer, 13 is a peristaltic pump, 14 is a water storage device, 15 is a cleaning water storage barrel, 16 is a compressed inert gas cylinder, 17 is an electromagnetic valve, 18 is a funnel, and 19 is a data processing module.
Detailed Description
The following examples are provided to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the raw materials are all conventional products on the market if not specifically indicated; the test methods involved are conventional methods unless otherwise specified.
Example (b): an electrochemical-based real-time detection system for nitrate nitrogen in soil, as shown in fig. 1-3, comprises:
the sample pretreatment unit is used for treating a sample to be detected into a filter suspension, and comprises a stirring pool 1, a stirrer 12 correspondingly arranged in the stirring pool 1, a quantitative water adding mechanism and a quantitative sampler 11, wherein the quantitative water adding mechanism comprises a peristaltic pump 13 and a water storage device 14, the water outlet end of the peristaltic pump 13 is communicated to the stirring pool 1 through a corresponding pipeline, and the water inlet end of the peristaltic pump is communicated to the water storage device 14;
the filter unit is used for filtering the filtered suspension transferred by the filter unit to obtain clear liquid and comprises a filter tank 2, a filter funnel 18, a multi-port peristaltic pump 10 and a waste liquid collecting container, wherein the turbid liquid suction end of the multi-port peristaltic pump 10 is communicated to the stirring tank 1, the clear liquid suction end of the multi-port peristaltic pump is communicated to the filter tank 2 through a pipeline, the waste liquid suction end of the multi-port peristaltic pump is communicated to the filter funnel 18 through a pipeline, the clear liquid outlet end of the multi-port peristaltic pump is communicated to the detection tank 5, and the waste liquid outlet end of the multi-port peristaltic pump is communicated to the waste liquid collecting container 4;
the electrochemical measurement unit comprises a detection pool 5, a nitrate electrode 7, an Ag/AgCl reference electrode 8, a pH electrode 6 and a temperature sensor 9, wherein the nitrate electrode 7, the Ag/AgCl reference electrode 8, the pH electrode 6 and the temperature sensor are used for collecting electric signals of a solution to be measured from the detection pool, and a data processing module 19 for processing the electric signals; the solution to be detected comes from quantitative transfer of the filter unit; signals collected by a nitrate electrode 7 in the electrochemical measurement unit are processed by a corresponding impedance matching, voltage-stabilizing filtering and amplifying module, an AD conversion module and a microprocessor and then output to a corresponding output end; the electrochemical measurement unit has one nitrate electrode redundant to reduce errors by multi-channel contrast.
The soil nitrate nitrogen real-time detection system also comprises a cleaning and purging mechanism which is composed of a cleaning water storage barrel 15, a compressed inert gas cylinder 16, an electromagnetic valve 17, a tee joint 3 and pipelines respectively communicated to the sample pretreatment unit (the filter tank 2), the filter unit (the funnel 18 and the filter tank 2) and the electrochemical measurement unit (the detection tank 5).
The use method of the soil nitrate nitrogen real-time detection system comprises the following steps:
using a quantitative sampler 11 to collect a quantitative fresh soil sample, putting the quantitative fresh soil sample into a stirring pool 1 of the detection system, and fully mixing the soil sample and water to obtain a suspension; then a peristaltic pump 13 extracts quantitative turbid liquid to a filter tank 2, and the turbid liquid is filtered to reserve clear liquid; the filtered clear liquid is injected into an electrochemical measuring unit through a multi-port peristaltic pump 10, a signal obtained by multi-parameter fusion of a nitrate electrode 7, an Ag/AgCl reference electrode 8, a pH electrode 6 and a temperature sensor 9 is transmitted to a data processing module 19, a nitrate electrode can be additionally provided, and errors are reduced through multi-channel comparison; the detection system transmits signals acquired by an electrochemical nitrate nitrogen electrode to a signal acquisition device consisting of a microprocessor through an impedance matching module, a voltage stabilizing filtering module, an amplifying module and an AD conversion module, performs data processing through the microprocessor with a nitrate nitrogen detection model (a combined electrode consisting of nitrate and a reference electrode and the nitrate electrode respectively establish a multiple linear regression model with a pH electrode and a temperature sensor, performs goodness-of-fit inspection, selects the nitrate nitrogen detection model with the best fitting degree according to linear correlation coefficients), transmits detection results to a liquid crystal touch screen, and exchanges information with an upper computer through a Bluetooth module and a USB interface, and the reference is made to figures 2 and 3.
After the measuring device finishes the measurement of nitrate nitrogen, a stirring tank container and a filter element are replaced, a multi-port peristaltic pump 10 is started, the soil solution to be measured is discharged into a waste liquid collecting container 4, meanwhile, deionized water is pumped by a peristaltic pump 13 and is injected into the whole measuring system, the measuring system is automatically cleaned, and after the cleaning, an electromagnetic valve 17 is started to introduce inert gas to purge the electrochemical electrode to be dry.
The present detection system is described in detail above with reference to the embodiments; however, those skilled in the art can understand that, without departing from the concept of the detection system, various specific parameters in the foregoing embodiments may be modified, or equivalent substitutions of related methods or steps may be made, so as to form a plurality of specific embodiments, which are all common variation ranges of the detection system, and are not described again.
Claims (4)
1. A soil nitrate nitrogen real-time detection system based on electrochemistry is characterized by comprising:
the sample pretreatment unit comprises a stirring pool, a stirrer, a quantitative water adding mechanism and a quantitative sampler, wherein the stirrer, the quantitative water adding mechanism and the quantitative sampler are correspondingly arranged in the stirring pool; the device is used for processing a sample to be detected into a filter suspension;
the filtering unit comprises a filtering tank and a filtering funnel and is used for filtering the filtered suspension from the sample pretreatment unit so as to obtain clear liquid;
the electrochemical measurement unit comprises a detection pool, a nitrate radical electrode, an Ag/AgCl reference electrode, a pH electrode and a temperature sensor, wherein the nitrate radical electrode, the Ag/AgCl reference electrode, the pH electrode and the temperature sensor are used for collecting electric signals of a solution to be measured from the detection pool, and a data processing module is used for processing the electric signals; the solution to be detected comes from quantitative transfer of the filter unit;
the filter unit also comprises a multi-port peristaltic pump and a waste liquid collecting container, wherein a turbid liquid suction end of the multi-port peristaltic pump is communicated to the stirring tank through a corresponding pipeline, a clear liquid suction end of the multi-port peristaltic pump is communicated to the filter tank through a pipeline, a waste liquid suction end of the multi-port peristaltic pump is communicated to the inside of the filter funnel through a pipeline, a clear liquid outlet end of the multi-port peristaltic pump is communicated to the detection tank, and a waste liquid outlet end of the multi-port peristaltic pump is communicated to the waste liquid collecting container.
2. The system for detecting nitrate nitrogen in soil in real time based on electrochemistry of claim 1, wherein signals collected by nitrate nitrogen electrodes in the electrochemical measurement unit are processed by a corresponding impedance matching, voltage-stabilizing filtering and amplifying module, an AD conversion module and a microprocessor and then output corresponding output ends.
3. The electrochemical-based real-time detection system for soil nitrate nitrogen in accordance with claim 1, wherein the electrochemical measurement unit redundantly carries at least one nitrate electrode to reduce errors through multi-channel contrast.
4. The electrochemical-based real-time detection system for soil nitrate nitrogen in the water according to claim 1, further comprising a cleaning and purging mechanism, wherein the cleaning and purging mechanism is composed of a cleaning water source, a compressed inert gas source, a control valve and pipelines respectively communicated with the sample pretreatment unit, the filtering unit and the electrochemical measuring unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112147202A (en) * | 2020-09-18 | 2020-12-29 | 河南农业大学 | Soil nitrate nitrogen real-time detection system and method based on electrochemistry |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112147202A (en) * | 2020-09-18 | 2020-12-29 | 河南农业大学 | Soil nitrate nitrogen real-time detection system and method based on electrochemistry |
| CN112147202B (en) * | 2020-09-18 | 2024-03-22 | 河南农业大学 | Electrochemical-based soil nitrate nitrogen real-time detection system and method |
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