CN107192754B - Farmland nitrate nitrogen detection method and system based on ion selective electrode - Google Patents
Farmland nitrate nitrogen detection method and system based on ion selective electrode Download PDFInfo
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Abstract
The present invention relates to a kind of farmland nitrate nitrogen detection method and system based on ion selective electrode, this method comprises: the first response potential and the second response potential of the master sample solution of detection various concentration at different temperatures；According to the first response potential and the second response potential of the master sample solution of each concentration at various temperatures, detection model is established；Detect first response potential and second response potential of the soil extraction to be detected at a temperature of farm environment；The nitrate ion concentration of the soil extraction is calculated using the detection model；The nitrate nitrogen content of soil to be detected is determined according to the nitrate ion concentration of soil extraction.Detection model established by the present invention not only allows for influence of the coexisting ion chloride ion to nitrate ion electrode, and also contemplate influence of the temperature to ion selective electrode, therefore relative to traditional detection method, the Detection accuracy of soil nitrate-N can be greatly improved.
Description
Technical field
The present invention relates to Soil K+adsorption technical fields, more particularly, to a kind of farmland nitre state based on ion selective electrode
Nitrogen detection method and system.
Background technique
Population sharply increases in the past 20 years in China, and cultivated area is reduced year by year, and grain security receives stern challenge.So
And excessive fertilization, inclined nitrogen fertilizer application cause serious soil pollution, ecological disruption, seriously threaten human health.The Party Central Committee, state
Institute be engaged in soil pollution great attention is administered, is drafting soil temperature and soil moisture content, is formulating Soil Pollution Control action plan.State
The fertilization compositions based on earth measurement project of family's starting finds out soil supplying nutrient capability, crop needs fertilizer by carrying out soil testing and field trial
Rule etc. proposes fertilizing constant, applies formula fertilizer.Wherein, the detection of farmland nitrate nitrogen content is to science, economy, the rational application of fertilizer
It is significant, it is both to economize on resources, develop an important channel of " two high one is excellent " agricultural, and preserving the ecological environment, protect
Hinder an important measures of grain security and human health.
Ion selective electrode is a kind of electrochemical sensing that specific potential response can be generated to object ion in solution
Device.More traditional chemical analysis method, ion selective electrode have quick, sensitive, accurate, equipment simply and can METHOD FOR CONTINUOUS DETERMINATIONs
The advantages that, in every profession and trade especially in chemical industry, medicine in terms of be widely used, and for content of soil nitrate-N analysis mention
Effective means is supplied.
Currently, the conventional ion electrodes selective based on polyvinyl chloride polymer film has been commercialized, but it is based on such electrode
Soil nitrate nitrogen determination have the following problems: soil constituent is more complex, and nitrate ion electrode is vulnerable in soil extraction
The interference of coexisting ion (especially chloride ion)；Moreover, the temperature change of detection environment can generate sensitive membrane and ionic activity
It influences.However, not considering coexisting ion and environment temperature these factors in actual measurement, therefore detected soil
Earth nitrate nitrogen content accuracy is not high.
Summary of the invention
For disadvantages described above, the present invention provides a kind of farmland nitrate nitrogen detection method based on ion selective electrode and is
System, it may be considered that influence and environment temperature to coexisting ion chloride ion to nitrate ion electrode influence detection bring,
Improve Detection accuracy.
In a first aspect, the farmland nitrate nitrogen detection method provided by the invention based on ion selective electrode includes:
Detect the first response potential and the second response potential of the master sample solution of various concentration at different temperatures, institute
The response potential that the first response potential is nitrate ion electrode is stated, the second response potential is the response electricity of chlorine ion electrode
Gesture；
According to the first response potential and the second response potential of the master sample solution of each concentration at various temperatures, build
A vertical detection model, the detection model includes the first response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature
The second function relationship of first function relationship and the second response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature；
Detect first response potential of the soil extraction of the soil to be detected at a temperature of collected farm environment
With the second response potential；
According to the first of the soil extraction the response potential, the second response potential of the soil extraction and the agriculture
Field environment temperature calculates the nitrate ion concentration of the soil extraction using the detection model；
The nitrate nitrogen content of the soil to be detected is determined according to the nitrate ion concentration of the soil extraction.
Optionally, the first response potential and second of the master sample solution according to each concentration at various temperatures
Potential is responded, a detection model is established, comprising:
Using arithmetic of linearity regression establish at each temperature first response potential, second response potential respectively with nitre
The functional relation of sour Na ion concentration and chlorine ion concentration:
Wherein, E1For the first response potential at this temperature, E2Potential is responded for second at this temperature,For the temperature
Nitrate ion concentration under degree,Chlorine ion concentration at this temperature, β01、β11、β21、β02、β12、β22For at this temperature
Regression parameter；
Each regression parameter and temperature are subjected to unitary linear fit using least square method, obtain the regression parameter and temperature
The unitary linear function of degree；
It is dense with nitric acid Na ion concentration and chloride ion respectively according to the first response potential, the second response potential at each temperature
The unitary linear function of the functional relation of degree and each regression parameter and temperature, determines the detection model are as follows:
Optionally, the nitrate ion concentration according to the soil extraction determines the nitre of the soil to be detected
State nitrogen content, comprising:
Establish the nitrate nitrogen content of soil and the volumetric water content of the nitrate ion concentration of corresponding soil extraction, soil
Between third functional relation；
The volumetric water content of the nitrate ion concentration of the soil extraction and collected soil to be detected is substituted into
The third functional relation calculates the nitrate nitrogen content of the soil to be detected.
Optionally, the third functional relation are as follows:
Wherein, ω is the nitrate nitrogen content of soil,For the nitrate ion concentration of soil extraction, θvFor soil
Volumetric water content.
Optionally, the master sample solution of the various concentration is known to the sodium nitrate solution and difference of different known concentrations
The mixed solution of the sodium chloride solution of concentration.
Optionally, the first response potential and second of the master sample solution of the detection various concentration at different temperatures
Respond potential, comprising:
The container for filling master sample solution and deionized water is placed in constant temperature liquid bath slot；
Using master sample solution described in nitrate ion electrode detection when constant temperature liquid bath slot is set as different temperatures
First response potential, detects the master sample solution when constant temperature liquid bath slot is set as different temperatures using chlorine ion electrode
Second response potential.
Second aspect, the farmland nitrate nitrogen detection system provided by the invention based on ion selective electrode includes nitrate anion
Ion electrode, chlorine ion electrode, constant temperature liquid bath slot, data collector and data processor, in which:
The nitrate ion electrode, for generating characterization nitrate anion when being placed in the soil extraction of soil to be detected
First response potential of ion concentration；
The chlorine ion electrode, for generating the second sound of characterization chlorine ion concentration when being placed in the soil extraction
Answer potential；
The constant temperature liquid bath slot, in the first response potential for detecting the soil extraction of soil to be detected and described the
When two response potentials, the soil extraction is maintained at farm environment temperature；
The data collector, for acquiring the first response potential, the chloride ion electricity of the nitrate ion electrode
The the second response potential and temperature sensor farm environment temperature collected of pole, and the data of acquisition are sent to the data
Processor；
The data processor, the data for being sent according to the data collector, using any of the above detection model,
The nitrate ion concentration of the soil extraction is calculated, and according to the nitrate ion concentration of the soil extraction, is determined
The nitrate nitrogen content of the soil to be detected.
Optionally, the data collector includes signal conditioning module, analog-to-digital conversion module and processing module, the system
It further include the moisture sensing of the temperature sensor for detecting farm environment temperature and the volumetric water content for detecting soil to be detected
Device, in which:
The signal conditioning module, for responding potential and chloride ion electricity to the first of the nitrate ion electrode
Second response potential of pole exports after carrying out impedance transformation, filtering and amplification；
The analog-to-digital conversion module is connect with the output end of the signal conditioning module, for the signal condition mould
The signal digitlization of block output；
The processing module is sensed with the output end, the temperature sensor and the moisture of the analog-to-digital conversion module
Device connection, for will it is digitized first response potential, it is digitized second respond potential, collected farm environment temperature and
The volumetric water content of collected soil to be detected is pre-processed.
Optionally, the data collector further include power module, display module, input module, wireless transport module and/
Or memory module, in which:
The power module is connect with the display module, the processing module and the signal conditioning module, for for
The display module, the processing module and the signal conditioning module provide power supply；
The display module is connect with the processing module, for showing pretreated data；
The input module is connect with the processing module, is carried out for processing module described in input control pretreated
Control instruction；
The wireless transport module is connect with the processing module, is used for the pretreated data of the processing module
It is sent to the data processor；
The memory module is connect with the processing module, for storing pretreated data.
According to above technical scheme, in farmland nitrate nitrogen detection method and system provided by the invention, detected using establishing
The mode of model is detected, and it includes the first response potential and nitric acid Na ion concentration, chlorine ion concentration that the detection model, which is,
With the second function of the first function relationship of temperature and the second response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature
Relationship, it is seen that detection model established by the present invention not only allows for coexisting ion chloride ion to the shadow of nitrate ion electrode
It rings, and also contemplates influence of the temperature to ion selective electrode, therefore relative to traditional detection method, can mention significantly
The Detection accuracy of high soil nitrate-N.
Detailed description of the invention
Can be more clearly understood characteristic information and advantage of the invention by reference to attached drawing, attached drawing be schematically without
It is interpreted as carrying out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows the stream of one embodiment of farmland nitrate nitrogen detection method based on ion selective electrode according to the present invention
Journey schematic diagram；
Fig. 2 shows the knots that the farmland nitrate nitrogen detection system according to the present invention based on ion selective electrode unifies embodiment
Structure block diagram.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The present invention provides a kind of farmland nitrate nitrogen detection method based on ion selective electrode, as shown in Figure 1, this method
Include:
S1, the first response potential and the second response electricity of the master sample solution of various concentration at different temperatures are detected
Gesture, the first response potential are the response potential of nitrate ion electrode, and the second response potential is chlorine ion electrode
Respond potential；
S2, the first response potential and the second response electricity according to the master sample solution of each concentration at various temperatures
Gesture, establishes a detection model, and the detection model includes the first response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature
The first function relationship of degree and the second function of the second response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature are closed
System；
S3, first response electricity of the soil extraction of the soil to be detected at a temperature of collected farm environment is detected
Gesture and the second response potential；
S4, potential, the second response potential of the soil extraction and institute are responded according to the first of the soil extraction
Farm environment temperature is stated, the nitrate ion concentration of the soil extraction is calculated using the detection model；
S5, the nitrate nitrogen content that the soil to be detected is determined according to the nitrate ion concentration of the soil extraction.
It in nitrate nitrogen detection method in farmland provided by the invention, is detected, and is somebody's turn to do by the way of establishing detection model
Detection model is the first function relationship and for including the first response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature
The second function relationship of two response potentials and nitric acid Na ion concentration, chlorine ion concentration and temperature, it is seen that established by the present invention
Detection model not only allows for influence of the coexisting ion chloride ion to nitrate ion electrode, and also contemplates temperature to ion
The influence of electrodes selective, therefore relative to traditional detection method, the Detection accuracy of soil nitrate-N can be greatly improved.
In the specific implementation, the master sample solution of various concentration can be the sodium nitrate solution and not of different known concentrations
Several master sample solution with the mixed solution of the sodium chloride solution of known concentration, such as in the following table 1:
The master sample solution of several various concentrations of table 1
As can be seen that the sodium chloride solution of the sodium nitrate solution of different known concentrations and different known concentrations from upper table 1
Constitute the master sample solution of various concentration.
In the specific implementation, the first response potential of the master sample solution of various concentration at different temperatures is detected in S1
With second response potential detailed process may include:
S11, the container for filling master sample solution and deionized water is placed in constant temperature liquid bath slot；
S12, different temperatures is set as in constant temperature liquid bath slot using master sample solution described in nitrate ion electrode detection
When the first response potential, the master sample solution is detected using chlorine ion electrode and is set as different temperatures in constant temperature liquid bath slot
When second response potential.
Here it every time after the complete master sample solution of electrode detection, is both needed to using deionized water cleaning electrode to blank electricity
Position can generate the cross contamination of potential memory and master sample solution to avoid electrode.
The detailed process of above-mentioned detection is illustrated with four groups of master sample solution in table 1:
Firstly, set the temperature of constant temperature liquid bath slot as 5 DEG C, the master sample solution for numbering as 1-1 is placed on constant temperature liquid
In bath, when the temperature of master sample solution is basicly stable, it is inserted into the nitrate ion electrode and chlorine ion electrode of activation, to
Electrode acquires corresponding response potential after stablizing.After the completion of detection, two electrodes are taken out, are cleaned with deionized water, and use filter paper
Blot the remaining moisture of electrode surface.In the same way, detection number is the master sample solution of 1-2,1-3,1-4 and remains
The response potential of excess-three group master sample solution.
Then, the temperature of constant temperature liquid bath slot is respectively set as 15 DEG C, 25 DEG C, 30 DEG C, adopts and detects four with the aforedescribed process
The master sample solution of group.
In the specific implementation, the process that detection model is established in S2 may include:
S21, the first response potential, the second response potential difference at each temperature are established using arithmetic of linearity regression
With functional relation, that is, multivariate regression models of nitric acid Na ion concentration and chlorine ion concentration:
Wherein, E1For the first response potential at this temperature, unit mV；E2It is single for the second response potential at this temperature
Position is mV；For nitrate ion concentration at this temperature, unit mol/L；Chlorine ion concentration at this temperature,
Unit is mol/L；β01、β11、β21、β02、β12、β22For regression parameter at this temperature.
It is understood that first in above-mentioned group of functions is the first response potential E1With pair of nitric acid Na ion concentration
It counts, the first linear function between the logarithm of chlorine ion concentration, second is the second response potential E2With nitric acid Na ion concentration
Logarithm, chlorine ion concentration logarithm between the second linear function.
Each regression parameter of table 2 at each temperature
As can be seen that the value of same regression parameter at different temperatures has nuance from upper table 2, it is therefore desirable to
Establish the relationship between regression parameter and temperature.
S22, unitary linear fit is carried out to each regression parameter and temperature using least square method, obtains the regression parameter
With the unitary linear function of temperature；
It is dense with nitric acid Na ion concentration and chloride ion respectively according to the first response potential, the second response potential at each temperature
The unitary linear function of the functional relation of degree and each regression parameter and temperature, determines the detection model are as follows:
For example, establish respectively at 5 DEG C, 15 DEG C, 25 DEG C, 30 DEG C first the first response potential and nitric acid Na ion concentration and
The functional relation of the functional relation of chlorine ion concentration, the second response potential and nitric acid Na ion concentration and chlorine ion concentration.Then
According to β under different temperatures01、β11、β21、β02、β12、β22In each regression parameter specific value, be fitted each regression parameter
With the relationship of temperature, and then above-mentioned detection model is obtained.
For example, according to being substituted into after the fitting of the occurrence of each regression parameter in above-mentioned table 2 progress regression parameter and temperature
In regression model, obtained detection model are as follows:
As it can be seen that the detection model finally obtained is the logarithm and chlorine of the first response potential and temperature, nitrate ion concentration
The logarithm and chlorine ion concentration of the functional relation of the logarithm of ion concentration and the second response potential and temperature, nitrate ion concentration
Logarithm functional relation, wherein temperature can detecte out, therefore be a binary quadratic equation group, actually detected
When, the first response potential and the second response potential are also that can detecte out, and then calculate nitrate ion concentration and chlorine
Ion concentration.
It is understood that the farm environment temperature in S3 should be the environment temperature in farmland where soil to be detected.
In the prior art, traditional soil pre-treatment link includes: that air-dried → crushing → sieving → amount sample → liquid feeding → stirs
It mixes → filters, it is excessively cumbersome, it is unable to satisfy the requirement of soil nutrient detection timeliness, wherein air dry operation is the most time-consuming.To mention
The timeliness of high detection, the present invention are to be detected using the volumetric water content for detecting fresh soil to be detected first, then by this
Soil direct liquid feeding production becomes the mode of soil extraction, and detailed process can be with are as follows: acquires respectively newly in several sampled points
Fresh wet soil sample 10mL is separately added into deionized water 50mL extraction, several pieces soil extraction can be obtained.But with fresh
When soil sample is directly extracted and is measured by fixed soil ratio, soil moisture be also influence content of soil nitrate-N accuracy in detection because
One of element, therefore the detailed process of S5 may include: in the present invention
S51, the nitrate nitrogen content for establishing soil contain with the volume of the nitrate ion concentration of corresponding soil extraction, soil
Third functional relation between water rate；
S52, by the volumetric water content of the nitrate ion concentration of the soil extraction and collected soil to be detected
The third functional relation is substituted into, the nitrate nitrogen content of the soil to be detected is calculated.
The advantage of doing so is that, it is contemplated that soil moisture content is influenced caused by detection process, further increases detection
Accuracy.Furthermore, it is possible to simplify soil pre-treatment step, the timeliness of detection is greatly improved.
In the specific implementation, the third functional relation, that is, nitrate nitrogen content updating formula, can be with are as follows:
Wherein, ω is the nitrate nitrogen content of soil, unit mg/L；It is dense for the nitrate ion of soil extraction
Degree, unit mol/L；14 be the molal weight of nitrogen, unit g/mol；103For unit conversion coefficient, unit mg/g；
θvFor the volumetric water content of soil；5 be extraction soil ratio (volume ratio).
The contrast table of each detection parameters of table 3 and soil nitrate-N measured value and reference value
Each detection parameters in upper table 3 are substituted into model, nitrate ion concentration are calculated, and utilize nitrate nitrogen content
Updating formula obtains content of soil nitrate-N.It can be seen that relative error maximum is 5% or so, detection accuracy meets what scene speed was surveyed
Required precision.Meanwhile because removing soil air dry operation from, the time for detecting cost shorten within 1 hour from 1~2 day, mentioned significantly
High detection timeliness.
The farmland nitrate nitrogen detection system based on ion selective electrode that the present invention also provides a kind of, as shown in Fig. 2, this is
System includes nitrate ion electrode, chlorine ion electrode, constant temperature liquid bath slot, data collector and data processor, in which:
The nitrate ion electrode, for generating characterization nitrate anion when being placed in the soil extraction of soil to be detected
First response potential of ion concentration；
The chlorine ion electrode, for generating the second sound of characterization chlorine ion concentration when being placed in the soil extraction
Answer potential；
The constant temperature liquid bath slot, in the first response potential for detecting the soil extraction of soil to be detected and described the
When two response potentials, the soil extraction is maintained at farm environment temperature；
The data collector, for acquiring the first response potential, the chloride ion electricity of the nitrate ion electrode
The the second response potential and temperature sensor farm environment temperature collected of pole, and the data of acquisition are sent to the data
Processor；
The data processor, the data for being sent according to the data collector, utilizes above-mentioned detection model meter
The nitrate ion concentration of the soil extraction is calculated, and according to the nitrate ion concentration of the soil extraction, determines institute
State the nitrate nitrogen content of soil to be detected, such as host computer.
Due to being detected in the nitrate nitrogen detection system of farmland using above-mentioned detection model, and detection model is packet
Include the first response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature first function relationship and second response potential with
The second function relationship of nitric acid Na ion concentration, chlorine ion concentration and temperature, it is seen that detection model established by the present invention is not only
Influence of the coexisting ion chloride ion to nitrate ion electrode is considered, and also contemplates temperature to ion selective electrode
It influences, therefore relative to traditional detection method, the Detection accuracy of soil nitrate-N can be greatly improved.
In the specific implementation, as shown in Fig. 2, the data collector may include signal conditioning module, analog-to-digital conversion mould
Block and processing module, the system also includes the temperature sensor of detection farm environment temperature and for detecting soil to be detected
The moisture transducer of volumetric water content, in which:
The signal conditioning module, for responding potential and chloride ion electricity to the first of the nitrate ion electrode
Second response potential of pole exports after carrying out impedance transformation, filtering and amplification；
The analog-to-digital conversion module is connect with the output end of the signal conditioning module, for the signal condition mould
The signal digitlization of block output, such as 12 analog-to-digital conversion modules；
The processing module is sensed with the output end, the temperature sensor and the moisture of the analog-to-digital conversion module
Device connection, for will it is digitized first response potential, it is digitized second respond potential, collected farm environment temperature and
The volumetric water content of collected soil to be detected is pre-processed, such as C8051F020 microprocessor.
In the specific implementation, as shown in Fig. 2, the data collector can also include power module, display module, input
Module, wireless transport module and/or memory module, in which:
The power module is connect with the display module, the processing module and the signal conditioning module, for for
The display module, the processing module and the signal conditioning module provide power supply；
The display module is connect with the processing module, for pretreated data to be shown, such as liquid crystal
Display device；
The input module is connect with the processing module, is carried out for processing module described in input control pretreated
Control instruction, such as keyboard；
The wireless transport module is connect with the processing module, is used for the pretreated data of the processing module
It is sent to the data processor, such as GPRS communication module；
The memory module is connect with the processing module, for pretreated data to be stored, such as USB flash disk.
When being detected using any of the above farmland nitrate nitrogen detection system, it is simple, at low cost, stable, accurate to have
Rate height, quick advantage can be used for instructing fertilising or field management.
In the present invention, term " first ", " second " are used for description purposes only, and are not understood to indicate or imply opposite
Importance.Term " multiple " refers to two or more, unless otherwise restricted clearly.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case where bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (7)
1. a kind of farmland nitrate nitrogen detection method based on ion selective electrode characterized by comprising
Detect the first response potential and the second response potential of the master sample solution of various concentration at different temperatures, described the
One response potential is the response potential of nitrate ion electrode, and the second response potential is the response potential of chlorine ion electrode；
According to the first response potential and the second response potential of the master sample solution of each concentration at various temperatures, one is established
Detection model, the detection model include the first of the first response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature
The second function relationship of functional relation and the second response potential and nitric acid Na ion concentration, chlorine ion concentration and temperature；
Detect first response potential and second sound of the soil extraction of soil to be detected at a temperature of collected farm environment
Answer potential；
According to the first of the soil extraction the response potential, the second response potential and the farmland ring of the soil extraction
Border temperature calculates the nitrate ion concentration of the soil extraction using the detection model；
The nitrate nitrogen content of the soil to be detected is determined according to the nitrate ion concentration of the soil extraction；
Wherein, the nitrate ion concentration according to the soil extraction determines that the nitrate nitrogen of the soil to be detected contains
Amount, comprising:
It establishes between the volumetric water content of the nitrate nitrogen content of soil and the nitrate ion concentration of corresponding soil extraction, soil
Third functional relation；
It will be described in the substitution of the volumetric water content of the nitrate ion concentration of the soil extraction and collected soil to be detected
Third functional relation calculates the nitrate nitrogen content of the soil to be detected；
The third functional relation are as follows:
Wherein, ω is the nitrate nitrogen content of soil,For the nitrate ion concentration of soil extraction, θvFor the volume of soil
Moisture content.
2. the method according to claim 1, wherein the master sample solution according to each concentration is each
At a temperature of first response potential and second response potential, establish a detection model, comprising:
Using arithmetic of linearity regression establish at each temperature first response potential, second response potential respectively with sodium nitrate
The functional relation of ion concentration and chlorine ion concentration:
Wherein, E1For the first response potential at this temperature, E2Potential is responded for second at this temperature,For at this temperature
Nitrate ion concentration,Chlorine ion concentration at this temperature, β01、β11、β21、β02、β12、β22For recurrence at this temperature
Parameter；
Each regression parameter and temperature are subjected to unitary linear fit using least square method, obtain the regression parameter and temperature
Unitary linear function；
According to the first response potential, the second response potential at each temperature respectively with nitric acid Na ion concentration and chlorine ion concentration
The unitary linear function of functional relation and each regression parameter and temperature, determines the detection model are as follows:
3. the method according to claim 1, wherein the master sample solution of the various concentration is known to difference
The mixed solution of the sodium nitrate solution of concentration and the sodium chloride solution of different known concentrations.
4. the method according to claim 1, wherein the master sample solution of the detection various concentration is in difference
At a temperature of first response potential and second response potential, comprising:
The container for filling master sample solution and deionized water is placed in constant temperature liquid bath slot；
Using master sample solution described in nitrate ion electrode detection when constant temperature liquid bath slot is set as different temperatures first
Potential is responded, second of the master sample solution when constant temperature liquid bath slot is set as different temperatures is detected using chlorine ion electrode
Respond potential.
5. a kind of farmland nitrate nitrogen detection system based on ion selective electrode, which is characterized in that including nitrate ion electricity
Pole, chlorine ion electrode, constant temperature liquid bath slot, data collector and data processor, in which:
The nitrate ion electrode, for generating characterization nitrate ion when being placed in the soil extraction of soil to be detected
First response potential of concentration；
The chlorine ion electrode, for generating the second response electricity of characterization chlorine ion concentration when being placed in the soil extraction
Gesture；
The constant temperature liquid bath slot, in the first response potential and second sound for detecting the soil extraction of soil to be detected
When answering potential, the soil extraction is maintained at farm environment temperature；
The data collector, for acquiring the first response potential, the chlorine ion electrode of the nitrate ion electrode
Second response potential and temperature sensor farm environment temperature collected, and the data of acquisition are sent to the data processing
Device；
The data processor, the data for being sent according to the data collector are according to claim 1 to 4
Method, calculates the nitrate ion concentration of the soil extraction, and according to the nitrate ion concentration of the soil extraction,
Determine the nitrate nitrogen content of the soil to be detected.
6. system according to claim 5, which is characterized in that the data collector includes signal conditioning module, modulus
Conversion module and processing module, the system also includes detection farm environment temperature temperature sensor and for detecting it is to be detected
The moisture transducer of the volumetric water content of soil, in which:
The signal conditioning module, for responding potential and the chlorine ion electrode to the first of the nitrate ion electrode
Second response potential exports after carrying out impedance transformation, filtering and amplification；
The analog-to-digital conversion module is connect with the output end of the signal conditioning module, for defeated to the signal conditioning module
Signal digitlization out；
The processing module connects with the output end, the temperature sensor and the moisture transducer of the analog-to-digital conversion module
It connects, for digitized first response potential, digitized second to be responded potential, collected farm environment temperature and acquisition
To the volumetric water content of soil to be detected pre-processed.
7. system according to claim 6, which is characterized in that the data collector further includes power module, display mould
Block, input module, wireless transport module and/or memory module, in which:
The power module is connect with the display module, the processing module and the signal conditioning module, for being described
Display module, the processing module and the signal conditioning module provide power supply；
The display module is connect with the processing module, for showing pretreated data；
The input module is connect with the processing module, carries out pretreated control for processing module described in input control
Instruction；
The wireless transport module is connect with the processing module, for sending the pretreated data of the processing module
To the data processor；
The memory module is connect with the processing module, for storing pretreated data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610147796.2A CN107192754B (en) | 2016-03-15 | 2016-03-15 | Farmland nitrate nitrogen detection method and system based on ion selective electrode |
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| CN102435656A (en) * | 2011-09-13 | 2012-05-02 | 中国农业大学 | Sensor array and method for quickly detecting soil nitrate nitrogen |
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| WO2012083371A1 (en) * | 2010-12-23 | 2012-06-28 | Crc Care Pty Ltd | Analyte ion detection method and device |
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| CN104198419B (en) * | 2014-08-14 | 2017-04-05 | 河南农业大学 | Soil nitrate-N digestion agent and soil nitrate-N rapid assay methods |
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| CN102175737A (en) * | 2010-12-30 | 2011-09-07 | 中国科学技术大学 | Correction method and device for cross sensitivity of ion-selective electrode for on-line detection of nutrient solution components |
| CN102435656A (en) * | 2011-09-13 | 2012-05-02 | 中国农业大学 | Sensor array and method for quickly detecting soil nitrate nitrogen |
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