CN215116022U - Water heavy metal detection device and system based on electrochemistry - Google Patents
Water heavy metal detection device and system based on electrochemistry Download PDFInfo
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- CN215116022U CN215116022U CN202120463880.1U CN202120463880U CN215116022U CN 215116022 U CN215116022 U CN 215116022U CN 202120463880 U CN202120463880 U CN 202120463880U CN 215116022 U CN215116022 U CN 215116022U
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 92
- 238000001514 detection method Methods 0.000 title claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 79
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
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- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 238000003950 stripping voltammetry Methods 0.000 description 11
- 150000002500 ions Chemical class 0.000 description 10
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- 101710176296 Switch 2 Proteins 0.000 description 4
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- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a water heavy metal detection device and system based on electrochemistry, including three electrode module and back end circuit, the back end circuit comprises microprocessor, constant potential module, power module and communication module, utilize power module to supply power for other modules, through microprocessor control constant potential module to three electrode module output excitation voltage make three electrode module and the liquid that awaits measuring react, control constant potential module gathers the electrode signal of three electrode module, confirm the change state of electrode signal, and control communication module sends the change state of electrode signal to appointed equipment, thereby can rely on appointed equipment to further analysis the change state of electrode signal and obtain the testing result of the heavy metal that awaits measuring liquid contains, compare with traditional electrochemistry analytical instrument, the back end circuit has been built to the device that has adopted relatively miniaturization to realize water heavy metal detection based on electrochemistry, the cost is reduced, the device volume is reduced, and the portable use of the user is convenient.
Description
Technical Field
The utility model relates to an environmental quality monitoring technology field especially relates to a water heavy metal detection device and system based on electrochemistry.
Background
Water safety is concerned with life health, and water quality detection is the key to guarantee water safety. The water quality sensor utilizing the electric signal detection has the advantages of quick response and easy integration. Total Dissolved Solids (TDS) detection based on water conductivity testing is a relatively mature water quality detection method. TDS detection detects moving electric ions by measuring conductance, only can monitor charged dissolved solids in water, and has a limited detection range, so that the TDS detection can only be used as a universal reference value and is difficult to be used as a detection standard. The problem of heavy metal pollution to water becomes an irresistible worldwide problem, and particularly, qualitative and quantitative analysis of trace heavy metals is an important content for heavy metal pollution detection. Because the traditional TDS detection mode can not realize the detection of the heavy metals in the water body, in order to realize the detection of the content of the heavy metals in the water body, an electrochemical analysis method is adopted to detect the types and the content of the heavy metals in the water body in the prior art.
However, since the electrochemical analysis apparatus is expensive, bulky and complex to operate, such as the commercial electrochemical measurement workstation CHI660E, the apparatus can only be used in professional testing laboratories and is not easily adopted by communities, families and individuals. Provides a portable water body heavy metal detection device, which solves the technical problems to be solved by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a water heavy metal detection device and system based on electrochemistry for realize that the water heavy metal of the easy operation of portableization detects.
In order to solve the technical problem, the utility model provides a water heavy metal detection device based on electrochemistry, include: a three-electrode module and a back-end circuit;
wherein the three-electrode module comprises a working electrode, a reference electrode and a counter electrode;
the back end circuit comprises a microprocessor, a constant potential module, a power supply module and a communication module; a first pin of the constant potential module is connected with a pin of the working electrode, a second pin of the constant potential module is connected with a pin of the reference electrode, and a third pin of the constant potential module is connected with a pin of the counter electrode; the first signal output end of the microprocessor is connected with the control end of the constant potential module, the signal input end of the microprocessor is connected with the signal output end of the constant potential module, the third signal output end of the microprocessor is connected with the input end of the communication module, the microprocessor is used for controlling the constant potential module to output excitation voltage to the three-electrode module, controlling the constant potential module to collect electrode signals of the three-electrode module, determining the change state of the electrode signals and controlling the communication module to send the change state of the electrode signals to designated equipment; and each output end of the power supply module is respectively connected with the power supply end of the three-electrode module, the power supply end of the microprocessor and the power supply end of the constant potential module.
Optionally, the three-electrode module specifically includes: the working electrode, the reference electrode, the counter electrode and an insulating substrate;
the working electrode comprises a working electrode reaction disc and a pin of the working electrode, wherein the pin of the working electrode is connected with the working electrode reaction disc, and the working electrode is a pure copper electrode;
the reference electrode comprises a first concentric arc arranged around the working electrode reaction disc and a pin of the reference electrode connected with the first concentric arc, and the reference electrode is an electrode with a chloridized pure copper surface;
the counter electrode comprises a second concentric circular arc surrounding the reference electrode and a pin of the counter electrode connected with the second concentric circular arc, and the counter electrode is a pure copper electrode;
the working electrode, the reference electrode and the counter electrode are all positioned on the surface of the insulating substrate.
Optionally, the device further comprises a device box body for packaging the back-end circuit;
the elements in the back end circuit are patch elements.
Optionally, the method further includes: the electrode socket is arranged between the three-electrode module and the constant potential module;
the first input end of the electrode socket is connected with the first pin of the constant potential module, and the first output end of the electrode socket is detachably connected with the pin of the working electrode; a second input end of the electrode socket is connected with a second pin of the constant potential module, and a second output end of the electrode socket is detachably connected with a pin of the reference electrode; and a third input end of the electrode socket is connected with a third pin of the constant potential module, and a third output end of the electrode socket is detachably connected with the pin of the counter electrode.
Optionally, the potentiostat module is specifically AD 8608.
Optionally, the microprocessor is specifically STM32F103RCT 6.
Optionally, the communication module is specifically a wireless communication module.
Optionally, the power module specifically includes: the device comprises a rechargeable battery and a voltage reduction and stabilization circuit;
the output end of the rechargeable battery is connected with the input end of the voltage reduction and voltage stabilization circuit, and each output end of the voltage reduction and voltage stabilization circuit is respectively connected with the power supply end of the three-electrode module, the power supply end of the microprocessor and the power supply end of the constant potential module.
In order to solve the technical problem, the utility model also provides an electrochemistry-based water body heavy metal detection system, which comprises the electrochemistry-based water body heavy metal detection device and a mobile terminal;
the mobile terminal is in communication connection with the communication module of the electrochemistry-based water body heavy metal detection device and is used for sending a test instruction to the microprocessor of the electrochemistry-based water body heavy metal detection device according to the test parameters, so that the microprocessor generates a test signal corresponding to the test instruction to the constant potential module of the electrochemistry-based water body heavy metal detection device, then receives the change state of the electrode signal and determines the detection result of heavy metal contained in the liquid to be detected on the three-electrode module of the electrochemistry-based water body heavy metal detection device according to the change state of the electrode signal.
Optionally, the mobile terminal determines a detection result of heavy metals contained in the liquid to be detected on the three-electrode module of the electrochemical-based water body heavy metal detection device according to the change state of the electrode signal, and specifically includes:
the mobile terminal generates a measurement data curve according to the change state of the electrode signal;
and the mobile terminal compares a preset data table according to the position of the peak value of the measurement data curve and the value of the peak value to determine the type of the heavy metal and the concentration of the heavy metal in the liquid to be measured.
The utility model provides a water heavy metal detection device based on electrochemistry, including three electrode module and back end circuit, the back end circuit comprises microprocessor, constant potential module, power module and communication module, utilize power module to supply power for other modules, through microprocessor control constant potential module to three electrode module output excitation voltage make three electrode module and the liquid that awaits measuring react, control constant potential module gathers the electrode signal of three electrode module, confirm the change state of electrode signal, and control communication module sends the change state of electrode signal to appointed equipment, thereby can rely on appointed equipment to further analysis the change state of electrode signal and obtain the testing result of the liquid heavy metal that awaits measuring contains, compare with traditional electrochemical analytical instrument, the back end circuit has been built to the device constitution that has adopted relatively miniaturization has realized the detection of water heavy metal based on electrochemistry, the device cost is reduced, the device volume is reduced, and the portable carrying and use of the user are convenient.
The utility model also provides a water heavy metal detecting system based on electrochemistry has above-mentioned beneficial effect, no longer gives unnecessary details here.
Drawings
In order to clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electrochemical-based water heavy metal detection device provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a constant potential module according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of a constant potential module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a three-electrode module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electrochemical-based water heavy metal detection system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an excitation signal of stripping voltammetry provided by an embodiment of the present invention;
fig. 7(a) is a comparison graph of positive divalent lead ion stripping voltammetry curves provided by the embodiment of the present invention;
FIG. 7(b) is a comparison graph of stripping voltammetry curves of positive cadmium divalent ions according to the embodiment of the present invention;
fig. 8(a) is a schematic view of a positive divalent lead ion stripping voltammetry provided by an embodiment of the present invention;
fig. 8(b) is a linear fitting graph of the dissolution current and concentration of positive divalent lead ions provided by the embodiment of the present invention;
fig. 8(c) is a schematic view of a positive divalent cadmium ion stripping voltammetry curve provided in an embodiment of the present invention;
fig. 8(d) is a linear fitting graph of the dissolution current and concentration of positive cadmium divalent ions according to an embodiment of the present invention;
the electrochemical-based water body heavy metal detection device comprises a water body heavy metal detection device 10, a three-electrode module 100, a working electrode 101, a reference electrode 102, a counter electrode 103, a rear-end circuit 200, a microprocessor 201, a constant potential module 202, a power supply module 203, a communication module 204, an electrode socket 205, an insulating substrate 401, a reaction container 402 and a mobile terminal 50.
Detailed Description
The core of the utility model is to provide a water heavy metal detection device and system based on electrochemistry for realize that the water heavy metal of the easy operation of portableization detects.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an electrochemical-based water heavy metal detection device 10 according to an embodiment of the present invention; fig. 2 is a circuit diagram of a constant potential module 202 according to an embodiment of the present invention; fig. 3 is a schematic connection diagram of a potentiostat module 202 according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an electrochemical-based water heavy metal detection apparatus 10, including: a three-electrode module 100 and a back-end circuit 200;
wherein the three-electrode module 100 comprises a working electrode 101, a reference electrode 102 and a counter electrode 103;
the back-end circuit 200 comprises a microprocessor 201, a constant potential module 202, a power supply module 203 and a communication module 204; a first pin of the constant potential module 202 is connected with a pin of the working electrode 101, a second pin of the constant potential module 202 is connected with a pin of the reference electrode 102, and a third pin of the constant potential module 202 is connected with a pin of the counter electrode 103; a first signal output end of the microprocessor 201 is connected with a control end of the constant potential module 202, a signal input end of the microprocessor 201 is connected with a signal output end of the constant potential module 202, a third signal output end of the microprocessor 201 is connected with an input end of the communication module 204, the microprocessor 201 is used for controlling the constant potential module 202 to output excitation voltage to the three-electrode module 100, controlling the constant potential module 202 to acquire electrode signals of the three-electrode module 100, determining the change state of the electrode signals, and controlling the communication module 204 to send the change state of the electrode signals to a designated device; the output ends of the power module 203 are respectively connected with the power supply end of the three-electrode module 100, the power supply end of the microprocessor 201 and the power supply end of the constant potential module 202.
In one implementation, the microprocessor 201 may employ an STM32F103RCT6, which includes a 32-bit ARM processor with built-in A/D and D/A converters; the microprocessor 201 is connected with the constant potential module 202 through an A/D converter and a D/A converter, and the D/A converter converts the called test instruction into an analog signal input to the constant potential module 202; the electrical signal returned by the potentiostat module 202 is converted to a data signal by an a/D converter.
As shown IN fig. 3, IN the constant potential module 202, an input terminal IN of a Single-pole Switch (Single Switch) is connected to a signal output terminal of the microprocessor 201, a power supply terminal V + of the Single Switch is connected to a dc power supply VCC, a normally open pin NO of the Single Switch is connected to a + IN _ D pin of the AD8608, a normally closed pin NC of the Single Switch is connected to an-IN _ D pin of the AD8608, a common pin COM of the Single Switch is connected to the working electrode 101(WE), a power supply terminal V + of the AD8608 is connected to the dc power supply VCC, a ground terminal V-ground of the AD8608, a-IN _ C pin of the AD8608 is connected to the counter electrode 103(RE), and an OUT _ C pin of the AD8608 is connected to the counter electrode 103 (CE).
The communication module 204 may employ a wireless communication module, such as a bluetooth module, a Wi-Fi module, etc., to increase device portability. The Bluetooth module can adopt HC-06 Bluetooth 4.0 BLE.
The power module 203 specifically includes: the device comprises a rechargeable battery and a voltage reduction and stabilization circuit; the output end of the rechargeable battery is connected with the input end of the voltage reduction and voltage stabilization circuit, and each output end of the voltage reduction and voltage stabilization circuit is respectively connected with the power supply end of the three-electrode module 100, the power supply end of the microprocessor 201 and the power supply end of the constant potential module 202. The rechargeable battery can adopt a 400mAh polymer lithium battery, the power of the device is about 80mW, and the device can theoretically continuously work for 20 hours.
For realizing the device miniaturization, the embodiment of the present invention provides an electrochemical-based water heavy metal detection device 10, which can further include a device box body for packaging the back-end circuit 200. The components in back-end circuit 200 are all patch elements. It is found by practice that the back-end circuit 200, when integrated, can be incorporated into a device in a box about 7cm by 4cm in size, weighing only 42.1 g.
In order to facilitate module replacement, the electrochemical-based water heavy metal detection device 10 provided in the embodiment of the present invention may further include an electrode socket 205 disposed between the three-electrode module 100 and the constant potential module 202; a first input end of the electrode socket 205 is connected with a first pin of the constant potential module 202, and a first output end of the electrode socket 205 is detachably connected with a pin of the working electrode 101; a second input end of the electrode socket 205 is connected with a second pin of the constant potential module 202, and a second output end of the electrode socket 205 is detachably connected with a pin of the reference electrode 102; the third input end of the electrode socket 205 is connected with the third pin of the constant potential module 202, and the third output end of the electrode socket 205 is detachably connected with the pin of the counter electrode 103.
The embodiment of the utility model provides a water heavy metal detection device 10 based on electrochemistry, including three electrode module 100 and back-end circuit 200, back-end circuit 200 comprises microprocessor 201, constant potential module 202, power module 203 and communication module 204, utilize power module 203 to supply power for other modules, control constant potential module 202 through microprocessor 201 and export excitation voltage to three electrode module 100 and make three electrode module 100 react with the liquid that awaits measuring, control constant potential module 202 and gather the electrode signal of three electrode module 100, confirm the change state of electrode signal, and control communication module 204 sends the change state of electrode signal to appointed equipment, thereby can rely on appointed equipment to further analysis the change state of electrode signal and obtain the testing result of the heavy metal that awaits measuring contains, compare in traditional electrochemical analysis instrument, the back-end circuit has been built to the device that has adopted relatively miniaturization has realized the heavy metal detection based on electrochemistry, the device cost is reduced, the device volume is reduced, and the portable carrying and use of the user are convenient.
Fig. 4 is a schematic structural diagram of a three-electrode module 100 according to an embodiment of the present invention.
On the basis of the above embodiment, in order to further reduce the device volume and improve the device portability, in the water heavy metal detection device 10 based on electrochemistry provided by the embodiment of the present invention, as shown in fig. 4, the three-electrode module 100 specifically includes: a working electrode 101, a reference electrode 102, a counter electrode 103, and an insulating substrate 401;
the working electrode 101 comprises a working electrode reaction disc and a pin of the working electrode 101 connected with the working electrode reaction disc, and the working electrode 101 is a pure copper electrode (Cu);
the reference electrode 102 comprises a first concentric circular arc arranged around the reaction disc of the working electrode and a pin of the reference electrode 102 connected with the first concentric circular arc, and the reference electrode 102 is a pure copper surface chloridized electrode (CuCl 2/Cu);
the counter electrode 103 comprises a second concentric circular arc surrounding the reference electrode 102 and a pin of the counter electrode 103 connected with the second concentric circular arc, and the counter electrode 103 is a pure copper electrode (Cu);
the working electrode 101, the reference electrode 102 and the counter electrode 103 are all located on the surface of the insulating substrate 401.
In a specific implementation, as shown in fig. 4, the working electrode reaction disk may be a circular disk with a radius of 1-2 cm, and correspondingly, the first concentric circular arc is a circular arc with an outer radius of 3-5 cm and a circular ring angle of 255-265 degrees, and the second concentric circular arc is a circular arc with an outer radius of 6-8 cm and a circular ring angle of 255-265 degrees. The distance between the working electrode reaction disc, the first concentric circular arc and the second concentric circular arc is 0.5-1 cm. The embodiment of the utility model provides an adopted three-electrode module 100 is favorable to improving current density distribution's homogeneity, reduces the sensor noise. Wherein, the radius is 1 ~ 2 cm's working electrode reaction dish and is favorable to: 1) adsorbing more heavy metal ions to the surface of the working electrode 101, and improving the response signal of the heavy metal ions; 2) the electro-catalytic performance of the working electrode 101 and the detection capability of the chemical oxygen demand of the water body are improved. However, the area of the reaction disk of the working electrode cannot be too large, otherwise, the resistance of the working electrode 101 is far larger than that of the counter electrode 103, and the accuracy of the test result is affected.
After the three electrodes are respectively formed on the insulating base by screen printing, the reaction vessel 402 is formed on the surface of the insulating base 401.
The above has detailed each embodiment that the water heavy metal detection device 10 based on electrochemistry corresponds, on this basis, the utility model also discloses the water heavy metal detection system based on electrochemistry that corresponds with the above-mentioned water heavy metal detection device 10 based on electrochemistry.
Fig. 5 is a schematic structural diagram of an electrochemical-based water heavy metal detection system according to an embodiment of the present invention; fig. 6 is a schematic diagram of an excitation signal of stripping voltammetry according to an embodiment of the present invention.
As shown in fig. 5, the electrochemical-based water heavy metal detection system provided in the embodiment of the present invention further includes a mobile terminal 50, in addition to the electrochemical-based water heavy metal detection device 10 in the above-mentioned embodiment;
the mobile terminal 50 is in communication connection with the communication module 204 of the electrochemical-based water body heavy metal detection device 10, and is configured to send a test instruction to the microprocessor 201 of the electrochemical-based water body heavy metal detection device 10 according to the test parameter, so that the microprocessor 201 generates a test signal corresponding to the test instruction to the constant potential module 202 of the electrochemical-based water body heavy metal detection device 10, then receives a change state of the electrode signal, and determines a detection result of heavy metal contained in the liquid to be detected on the three-electrode module 100 of the electrochemical-based water body heavy metal detection device 10 according to the change state of the electrode signal.
In a specific implementation, in the embodiment of the present invention, the microprocessor 201 defines the type of the test curve through a program, and gives a mapping relationship between the corresponding excitation voltage and time, as shown in fig. 6, a stripping voltammetry test method commonly used in electrochemistry is adopted, and the voltage and time are in an increasing square wave relationship, so that after the initial voltage Init V, the Final voltage Final V, the potential increment Δ V, and the cycle time Δ t are determined, the built-in mapping relationship can be called to obtain the excitation signal waveform, and the microprocessor 201 controls the constant potential module 202 to output the excitation voltage to the three-electrode module 100 according to the built-in clock. With the deep development of the technology, the electrochemical-based water body heavy metal detection device 10 can integrate more functional modules and write more test curves under the same volume and cost, so that the electrochemical detection under various conditions is realized, and the detection requirements under different application conditions are met.
The mobile terminal 50 may adopt smart devices such as a mobile phone, a tablet, a notebook, and the like, and after networking is performed by a mobile communication technology, the received measurement data, the detection result obtained by analysis, and the positioning information obtained by the GPS are packaged and uploaded to a pre-built heavy metal detection system (cloud server), so that remote application of data is realized. The mobile terminal 50 determines a detection result of heavy metals contained in the liquid to be detected on the three-electrode module 100 of the electrochemical-based water heavy metal detection device 10 according to the change state of the electrode signal, and specifically may include: the mobile terminal 50 generates a measurement data curve according to the change state of the electrode signal; the mobile terminal 50 compares the preset data table to determine the type of the heavy metal and the concentration of the heavy metal in the liquid to be measured according to the position of the peak value of the measurement data curve and the value of the peak value.
Fig. 7(a) is a comparison graph of positive divalent lead ion stripping voltammetry curves provided by the embodiment of the present invention; FIG. 7(b) is a comparison graph of stripping voltammetry curves of positive cadmium divalent ions according to the embodiment of the present invention; fig. 8(a) is a schematic view of a positive divalent lead ion stripping voltammetry provided by an embodiment of the present invention; fig. 8(b) is a linear fitting graph of the dissolution current and concentration of positive divalent lead ions provided by the embodiment of the present invention; fig. 8(c) is a schematic view of a positive divalent cadmium ion stripping voltammetry curve provided in an embodiment of the present invention; fig. 8(d) is a linear fitting graph of the dissolution current and concentration of positive divalent cadmium ions according to an embodiment of the present invention.
Based on the water heavy metal detecting system based on electrochemistry that above-mentioned embodiment provided, the embodiment of the utility model provides a water heavy metal detecting method based on electrochemistry specifically can include:
dripping 1-5 drops of liquid to be tested into a reaction container 402 of the three-electrode module 100, setting test parameters through the mobile terminal 50, then sending a test instruction, controlling the microprocessor 201 to generate a test signal, and generating excitation voltage for the three-electrode module 100 through the constant potential module 202;
the constant potential module 202 returns the change of the electric signal, and an A/D converter of the microprocessor 201 obtains a digital signal;
the microprocessor 201 sends the measured digital signal to the mobile terminal 50 through the communication module 204, and the mobile terminal 50 stores the test data and draws a measurement data curve according to the test data;
the mobile terminal 50 compares and compares the position of the peak value of the measurement data curve with the value of the peak value to determine the type and concentration of the heavy metal in the liquid to be measured;
the mobile terminal 50 acquires the geographical position information, packages the geographical position information with the test data and the detection result, and uploads the packaged geographical position information to the cloud server, so that remote application is realized.
In practical application, adopt the utility model provides a water heavy metal detection system based on electrochemistry detects positive bivalent lead ion (Pb2+), positive bivalent cadmium ion (Cd2+) in to the water to compare with commercial electrochemistry survey workstation (model: CHI660E), the result is shown in figure 7(a) and figure 7(b) respectively, it is visible the utility model provides a curve SBEA that water heavy metal detection system based on electrochemistry records accords with the large-scale professional instrument in traditional laboratory basically accords with, and peak position, peak current differ within 5%.
Adopt the embodiment of the utility model provides a water heavy metal detection system based on electrochemistry detects positive bivalent lead ion (Pb2+), positive bivalent cadmium ion (Cd2+) of different concentrations, and the test curve is shown as figure 8(a), figure 8(b), figure 8(c) and figure 8(d) respectively, and along with the increase of water heavy metal ion concentration, peak current is big (figure 8(a), figure 8 (c)). And the current of the measured data curve is proportional to the concentration of the divalent lead ions (Pb2+) and the concentration of the divalent cadmium ions (Cd2+) (fig. 8(b) and 8 (d)). According to the graphs in FIG. 8(b) and FIG. 8(d), the detection limits of the divalent positive lead ion (Pb2+) and the divalent positive cadmium ion (Cd2+) are calculated to be 2.07 μ g/L and 1.12 μ g/L respectively, and the detection limits meet the requirements of national standard GB 5749-: pb2+ < 10. mu.g/L, Cd2+ < 5. mu.g/L.
It is right above the utility model provides a water heavy metal detection device and system based on electrochemistry introduces in detail. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. The utility model provides a water heavy metal detection device based on electrochemistry which characterized in that includes: a three-electrode module and a back-end circuit;
wherein the three-electrode module comprises a working electrode, a reference electrode and a counter electrode;
the back end circuit comprises a microprocessor, a constant potential module, a power supply module and a communication module; a first pin of the constant potential module is connected with a pin of the working electrode, a second pin of the constant potential module is connected with a pin of the reference electrode, and a third pin of the constant potential module is connected with a pin of the counter electrode; the first signal output end of the microprocessor is connected with the control end of the constant potential module, the signal input end of the microprocessor is connected with the signal output end of the constant potential module, the third signal output end of the microprocessor is connected with the input end of the communication module, the microprocessor is used for controlling the constant potential module to output excitation voltage to the three-electrode module, controlling the constant potential module to collect electrode signals of the three-electrode module, determining the change state of the electrode signals and controlling the communication module to send the change state of the electrode signals to designated equipment; and each output end of the power supply module is respectively connected with the power supply end of the three-electrode module, the power supply end of the microprocessor and the power supply end of the constant potential module.
2. The device for detecting the heavy metal in the water body according to claim 1, wherein the three-electrode module specifically comprises: the working electrode, the reference electrode, the counter electrode and an insulating substrate;
the working electrode comprises a working electrode reaction disc and a pin of the working electrode, wherein the pin of the working electrode is connected with the working electrode reaction disc, and the working electrode is a pure copper electrode;
the reference electrode comprises a first concentric arc arranged around the working electrode reaction disc and a pin of the reference electrode connected with the first concentric arc, and the reference electrode is an electrode with a chloridized pure copper surface;
the counter electrode comprises a second concentric circular arc surrounding the reference electrode and a pin of the counter electrode connected with the second concentric circular arc, and the counter electrode is a pure copper electrode;
the working electrode, the reference electrode and the counter electrode are all positioned on the surface of the insulating substrate.
3. The device for detecting heavy metals in water bodies according to claim 1, further comprising a device box body for packaging the back-end circuit;
the elements in the back end circuit are patch elements.
4. The device for detecting heavy metals in water body according to claim 1, further comprising: the electrode socket is arranged between the three-electrode module and the constant potential module;
the first input end of the electrode socket is connected with the first pin of the constant potential module, and the first output end of the electrode socket is detachably connected with the pin of the working electrode; a second input end of the electrode socket is connected with a second pin of the constant potential module, and a second output end of the electrode socket is detachably connected with a pin of the reference electrode; and a third input end of the electrode socket is connected with a third pin of the constant potential module, and a third output end of the electrode socket is detachably connected with the pin of the counter electrode.
5. The device for detecting the heavy metal in the water body according to claim 1, wherein the constant potential module is AD 8608.
6. The device for detecting heavy metals in water body according to claim 1, wherein the microprocessor is STM32F103RCT 6.
7. The device for detecting the heavy metal in the water body according to claim 1, wherein the communication module is a wireless communication module.
8. The device for detecting the heavy metal in the water body according to claim 1, wherein the power module specifically comprises: the device comprises a rechargeable battery and a voltage reduction and stabilization circuit;
the output end of the rechargeable battery is connected with the input end of the voltage reduction and voltage stabilization circuit, and each output end of the voltage reduction and voltage stabilization circuit is respectively connected with the power supply end of the three-electrode module, the power supply end of the microprocessor and the power supply end of the constant potential module.
9. An electrochemical-based water body heavy metal detection system, which is characterized by comprising the electrochemical-based water body heavy metal detection device according to one of claims 1 to 8, and further comprising a mobile terminal;
the mobile terminal is in communication connection with the communication module of the electrochemistry-based water body heavy metal detection device and is used for sending a test instruction to the microprocessor of the electrochemistry-based water body heavy metal detection device according to the test parameters, so that the microprocessor generates a test signal corresponding to the test instruction to the constant potential module of the electrochemistry-based water body heavy metal detection device, then receives the change state of the electrode signal and determines the detection result of heavy metal contained in the liquid to be detected on the three-electrode module of the electrochemistry-based water body heavy metal detection device according to the change state of the electrode signal.
10. The water body heavy metal detection system according to claim 9, wherein the mobile terminal determines a detection result of heavy metal contained in the liquid to be detected on the three-electrode module of the electrochemical-based water body heavy metal detection device according to the change state of the electrode signal, and specifically includes:
the mobile terminal generates a measurement data curve according to the change state of the electrode signal;
and the mobile terminal compares a preset data table according to the position of the peak value of the measurement data curve and the value of the peak value to determine the type of the heavy metal and the concentration of the heavy metal in the liquid to be measured.
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| CN114460157A (en) * | 2021-03-04 | 2022-05-10 | 海南聚能科技创新研究院有限公司 | Water heavy metal detection device and system based on electrochemistry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114460157A (en) * | 2021-03-04 | 2022-05-10 | 海南聚能科技创新研究院有限公司 | Water heavy metal detection device and system based on electrochemistry |
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