CN104458870A - Heavy metal ion concentration automatic detection system - Google Patents
Heavy metal ion concentration automatic detection system Download PDFInfo
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- CN104458870A CN104458870A CN201410692700.1A CN201410692700A CN104458870A CN 104458870 A CN104458870 A CN 104458870A CN 201410692700 A CN201410692700 A CN 201410692700A CN 104458870 A CN104458870 A CN 104458870A
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Abstract
The invention discloses a heavy metal ion concentration automatic detection system. The system comprises a microcontroller module, an ion concentration detection unit, a voltage amplifier unit, an analog-digital converter unit, a display unit and a data storage unit, wherein the ion concentration detection unit, the voltage amplifier unit and the analog-digital converter unit are connected in sequence; the analog-digital converter unit, the display unit and the data storage unit are connected with corresponding ports of the microcontroller module. The system can perform computation processing according to voltage signals gathered by the ion concentration detection unit, so as to obtain the ion concentration, namely can obtain the corresponding relationship between the ion concentration and membrane potential according to a Nernst equation, further obtain the ion concentration by detecting the voltage signals, and can realize the measurement, display and storage of the ion concentration.
Description
Technical field
The present invention relates to a kind of automatic checkout system, particularly relate to a kind of concentration of heavy metal ion automatic checkout system, belong to automatic detection field.
Background technology
Along with the continuous quickening of process of industrialization and the sustainable growth of population, the heavy metal pollutions such as lead, copper, zinc become global problem.The exploitation of mankind's heavy metal, smelting, processing and business manufacturing activities increasing, happen occasionally by surprisingly revealing the sudden water quality heavy metal pollution accident that the reasons such as discharge in violation of regulations cause.It is large that heavy metal has toxicity, in the environment not easily by metabolism, is easily bioaccumulation and has the features such as biological amplification, not only can contaminant water environment, also can the existence of the serious threat mankind and aquatic organism, detects heavy metal concentration effectively accurately particularly important.
Agricultural soil is the class special soil strongly affected by mankind's activity, and its environmental quality and people's is healthy closely related.Cure of Soil pollution is mainly from a large amount of uses of Industrial " three Waste " and agricultural chemicals, chemical fertilizer, pollutant enters people's soil by irrigation water, also soil pollution is caused by atmospheric pollution, aerial particle (containing heavy metal and carcinogen etc.) dried wet deposition, As time goes on, the content of beary metal such as farmland topsoil lead, copper, zinc has the trend of increase.Due to the absorption of crops, Transport And Transformation is in Crop Root cauline leaf and fruit from soil for heavy metal element, thus the related heavy metal pollution causing crops, jeopardizes the general level of the health of people.Therefore, the on-line measurement how realizing Vegetable produce base heavy metal content in soil fast and easily becomes a vital realistic problem.
Such as application number is a kind of regional water environment heavy metal monitoring system of " 201320688736.3 ", multiple monitoring terminals that this system comprises management system for monitoring and is connected with it through GPRS.The transmitting-receiving of management system for monitoring center processor connection data, Data Analysis Services and database management module, also connect display/user terminal, and data transmit-receive module connects storage GPS, GIS of each monitoring terminal and the database of heavy metals concentration.The main control module of each monitoring terminal comprises flush bonding processor and clock and GPRS submodule, and detection module comprises temperature sensor and heavy-metal electrochemical sensor array.During operation monitoring terminal survey the temperature of water environment and heavy metal concentration and be sent to management system for monitoring and store and show.Itself and standard value and historical data contrast by Data Analysis Services module, when jumping for polluted water or certain heavy metal concentration, report to the police.This system needs to be further improved in accuracy of detection and mode.
And for example application number is a kind of secondary application of sample concentration of heavy metal ion method of testing of " 201410291064.1 ", comprises the steps: to carry out pre-service to water sample; Preparation concentration of heavy metal ion is standard model solution and the electrolytic solution of Cs; Add the electrolytic solution that volume is V0 in electrolytic tank, in electrolytic tank, add the water sample that volume is Vx, obtain corresponding peak height h1 from current-voltage curve figure a1; Add the water sample that volume is Vx in electrolytic solution, obtain corresponding peak height h2 from current-voltage curve figure a2; Add the standard model that volume is Vs in electrolytic tank, obtain corresponding peak height h3 from current-voltage curve figure a3; Concentration of heavy metal ion adopts 3 algorithms to calculate, and obtains concentration of heavy metal ion Cx, and the average calculation error.This invention solves the problem of peak height-concentration curve only co-ordinate zero point, reduces the non-linear impact on measurement result of peak height-concentration curve.This invention cost is higher, and complicated operation, detection mode needs to be further improved.
Summary of the invention
Technical matters to be solved by this invention provides a kind of concentration of heavy metal ion automatic checkout system for the deficiency of background technology, can realize the measurement to ion concentration, display and storage.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of concentration of heavy metal ion automatic checkout system, comprise micro controller module, ion concentration detecting unit, voltage amplifier unit, analog to digital converter unit, display unit, data storage cell, described ion concentration detecting unit, voltage amplifier unit, analog to digital converter unit connect successively, and described analog to digital converter unit, display unit, data storage cell are connected on the corresponding port of micro controller module;
The analog voltage signal that described ion concentration detecting unit is used for ion electrode produces gathers;
Described voltage amplifier unit is used for analog voltage signal to carry out filtering and amplification;
AD conversion unit is used for the analog voltage signal after by amplification and changes into digital signal;
Micro controller module is used for according to this digital signal, adopts Nernst equation computing to draw ion concentration;
Display unit is used for the ion concentration that display micro controller module in real time calculates;
Data storage cell is used for the ion concentration that real-time storage controller module calculates
As the further preferred version of a kind of concentration of heavy metal ion of the present invention automatic checkout system, the model of described micro controller module is AVR series monolithic.
As the further preferred version of a kind of concentration of heavy metal ion of the present invention automatic checkout system, described display unit is LCD display.
As the further preferred version of a kind of concentration of heavy metal ion of the present invention automatic checkout system, this system adopts chargeable storage to power.
As the further preferred version of a kind of concentration of heavy metal ion of the present invention automatic checkout system, described data storage cell is DDR2.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, structure of the present invention simple, be easy to realize and automatically can measure the wide and high of object, save manpower;
2, the present invention can draw ion concentration according to carrying out computing according to the voltage signal of ion concentration detecting unit collection; Namely draw the relation of the correspondence of ion concentration and film potential according to Nernst equation and then draw ion concentration by detectable voltage signals;
3, the present invention can realize measurement to ion concentration, display and storage.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of concentration of heavy metal ion automatic checkout system, comprise micro controller module, ion concentration detecting unit, voltage amplifier unit, analog to digital converter unit, display unit, data storage cell, described ion concentration detecting unit, voltage amplifier unit, analog to digital converter unit connect successively, and described analog to digital converter unit, display unit, data storage cell are connected on the corresponding port of micro controller module;
Described ion concentration detecting unit gathers the voltage signal that ion electrode produces;
Described voltage amplifier unit is used for filtering and the amplification of voltage signal;
AD conversion unit is used for the analog voltage of collection to change into digital signal;
Micro controller module is used for carrying out computing according to this digital signal and draws ion concentration;
Display unit is used for the ion concentration that display micro controller module in real time calculates;
Data storage cell is used for the ion concentration that real-time storage controller module calculates.
Wherein, the model of described micro controller module is AVR series monolithic, and described display unit is LCD display, and this system adopts chargeable storage to power, and described data storage cell is DDR2.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; The minimum 1.8V of some devices gets final product work; AVR single chip security performance is good.
For the heavy metal pollution that Vegetable Base exists, invent a kind of concentration of heavy metal ion automatic checkout system.This system, based on ion selective membrane technology, utilizes the electrochemical response performance of potentiometry research ISE, and sets up the mathematical model of electrode potential and ion concentration in conjunction with one-variable linear regression.Based on AVR single chip and AD620 transport and placing device, devise hardware detecting circuit and trace routine, achieve the operations such as the measurement to ion concentration, display and storage.
The principle of ion concentration detecting unit: ion-selective electrode is a kind of electromotive force type electrochemical sensor, the key component of ion-selective electrode is ion-selective membrane, electron exchange can not be there is in ion-selective membrane, but owing to there is ion concentration difference, ion-exchange can be there is in the both side surface of ion-selective membrane, form concentration difference membrane potential, it is as follows that the particular ion concentration in membrane potential and solution to be measured obeys Nernst equation:
Nernst equation is the principle of work of ion-selective electrode.Due to the ion activity a of ion-selective electrode internal reference solution
jkeep constant, therefore membrane potential can be expressed as:
In formula: E
mfor membrane potential (V); R=8.314J/ (Kmol) is gas law constant; E
0for initial potential, T=t+273.15 is absolute temperature (K); F is Faraday constant (96487c/mol); Z
ifor ionic charge number; a
ifor ion activity to be measured, such film potential just becomes the function of ion concentration logarithm.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. a concentration of heavy metal ion automatic checkout system, it is characterized in that: comprise micro controller module, ion concentration detecting unit, voltage amplifier unit, analog to digital converter unit, display unit, data storage cell, described ion concentration detecting unit, voltage amplifier unit, analog to digital converter unit connect successively, and described analog to digital converter unit, display unit, data storage cell are connected on the corresponding port of micro controller module;
The analog voltage signal that described ion concentration detecting unit is used for ion electrode produces gathers;
Described voltage amplifier unit is used for analog voltage signal to carry out filtering and amplification;
AD conversion unit is used for the analog voltage signal after by amplification and changes into digital signal;
Micro controller module is used for according to this digital signal, adopts Nernst equation computing to draw ion concentration;
Display unit is used for the ion concentration that display micro controller module in real time calculates;
Data storage cell is used for the ion concentration that real-time storage controller module calculates.
2. a kind of concentration of heavy metal ion automatic checkout system according to claim 1, is characterized in that: the model of described micro controller module is AVR series monolithic.
3. a kind of concentration of heavy metal ion automatic checkout system according to claim 1, is characterized in that: described display unit is LCD display.
4. a kind of concentration of heavy metal ion automatic checkout system according to claim 1, is characterized in that: this system adopts chargeable storage to power.
5. a kind of concentration of heavy metal ion automatic checkout system according to claim 1, is characterized in that: described data storage cell is DDR2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692700.1A CN104458870A (en) | 2014-11-25 | 2014-11-25 | Heavy metal ion concentration automatic detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410692700.1A CN104458870A (en) | 2014-11-25 | 2014-11-25 | Heavy metal ion concentration automatic detection system |
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| CN104458870A true CN104458870A (en) | 2015-03-25 |
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| CN201410692700.1A Withdrawn CN104458870A (en) | 2014-11-25 | 2014-11-25 | Heavy metal ion concentration automatic detection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116015A (en) * | 2015-08-17 | 2015-12-02 | 何长毛 | Testing method and device for ion concentration in vegetable or fruit |
| CN105784800A (en) * | 2016-04-28 | 2016-07-20 | 无锡昊瑜节能环保设备有限公司 | Intelligent monitoring system for heavy metal content of industrial water quality |
| CN105929004A (en) * | 2016-04-28 | 2016-09-07 | 无锡昊瑜节能环保设备有限公司 | Radio frequency identification-based industrial water heavy metal content intelligent monitoring system |
| CN106198696A (en) * | 2016-07-04 | 2016-12-07 | 太原理工大学 | Portable trace heavy metal ion Concentration Testing pen |
-
2014
- 2014-11-25 CN CN201410692700.1A patent/CN104458870A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116015A (en) * | 2015-08-17 | 2015-12-02 | 何长毛 | Testing method and device for ion concentration in vegetable or fruit |
| CN105784800A (en) * | 2016-04-28 | 2016-07-20 | 无锡昊瑜节能环保设备有限公司 | Intelligent monitoring system for heavy metal content of industrial water quality |
| CN105929004A (en) * | 2016-04-28 | 2016-09-07 | 无锡昊瑜节能环保设备有限公司 | Radio frequency identification-based industrial water heavy metal content intelligent monitoring system |
| CN106198696A (en) * | 2016-07-04 | 2016-12-07 | 太原理工大学 | Portable trace heavy metal ion Concentration Testing pen |
| CN106198696B (en) * | 2016-07-04 | 2018-04-24 | 太原理工大学 | Portable trace heavy metal ion Concentration Testing pen |
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Application publication date: 20150325 |