CN212364175U - Heavy metal ion rapid detection platform - Google Patents
Heavy metal ion rapid detection platform Download PDFInfo
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- CN212364175U CN212364175U CN202020787701.5U CN202020787701U CN212364175U CN 212364175 U CN212364175 U CN 212364175U CN 202020787701 U CN202020787701 U CN 202020787701U CN 212364175 U CN212364175 U CN 212364175U
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502715—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by interfacing components, e.g. fluidic, electrical, optical or mechanical interfaces
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- B01L2200/027—Fluid interfacing between devices or objects, e.g. connectors, inlet details for microfluidic devices
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- B01L2300/00—Additional constructional details
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- B01L2300/0627—Sensor or part of a sensor is integrated
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Abstract
The embodiment of the utility model provides a heavy metal ion rapid detection platform, which comprises a microfluidic detection chip, an electrochemical workstation, a mobile PC, a peristaltic pump and a liquid container to be detected; the micro-fluidic detection chip consists of a micro-fluidic unit and a three-electrode sensor, wherein the micro-fluidic unit internally comprises a micro-channel, and a liquid inlet pipeline and a liquid outlet pipeline are respectively arranged at two ends of the micro-channel; the three-electrode sensor comprises three electrodes; the liquid container to be detected is connected with a liquid inlet pipeline through a first hose, and a peristaltic pump is arranged on the first hose to drive the solution to be detected; the contact pins of each electrode of the three-electrode sensor are respectively connected with the corresponding electrode connecting ends on the electrochemical workstation; the mobile PC is connected with the electrochemical workstation for detection control and data acquisition. The utility model discloses heavy metal ion short-term test platform equipment integrated level is high, and portable easy-to-use adopts micro-fluidic detection chip, has the characteristics that detect sensitivity, the degree of accuracy is high, detection efficiency is high, and specially adapted is to heavy metal ion's on-the-spot short-term test.
Description
Technical Field
The utility model belongs to the technical field of the electrochemistry detects, in particular to heavy metal ion rapid detection platform for dissolve out the harmful heavy metal ion in the voltammetry short-term test solution through the positive pole.
Background
With the development of the global electronic industry in recent decades, the number of electronic products has increased explosively, which brings more and more convenience and benefits to human society on one hand, and brings accumulated electronic garbage like mountains and serious environmental pollution to human society on the other hand. Heavy metals widely exist in electronic products, are one of the most main pollution components in electronic garbage, can directly enter soil, water and atmosphere to cause direct pollution, and can also cause indirect pollution among different environments through migration. The control of toxic and harmful pollutants in the electronic garbage, particularly heavy metal ions, is increasingly strict in various countries, and higher requirements are provided for the detection of the content of the heavy metals.
At present, the pretreatment technology of electronic products is mature, electronic garbage can be conveniently digested into solution, but the heavy metal content in the digested solution still needs to be detected and analyzed by a large-scale instrument, and the field detection efficiency of heavy metal ions still needs to be improved urgently. In the prior art, an Anodic Stripping Voltammetry (ASV) can perform qualitative and quantitative analysis on the content of metal ions in a solution based on the characteristic that each metal has specific oxidation or stripping peak potential, and instruments used by the ASV are usually relatively small in size and low in cost and have the technical development prospect of being applied to the field rapid detection of the heavy metal ions. With the development of the micro-fluidic chip technology in recent years, micro-channels can be processed on a very small substrate material, and various functions are integrated on the chip, and the micro-fluidic chip technology has the characteristics of miniaturization and integration and is very suitable for the technical requirements of the on-site rapid detection of the ASV heavy metal ions, so that the heavy metal ion detection device based on the ASV and combined with the micro-fluidic technology becomes the expected technical development direction of the on-site rapid detection of the heavy metals. How to realize the convenient and quick on-site quick detection of the heavy metal ions with low cost becomes an faced technical problem.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the technical problem that prior art heavy metal check out test set is difficult to satisfy the demand of the on-the-spot short-term test of heavy metal ion, provide a heavy metal ion short-term test platform, test platform has the integrated level height, conveniently carries, and the advantages of core component miniaturation, detection capability are good etc. are suitable for the on-the-spot short-term test of heavy metal ion in the solution very much.
In order to solve the technical problem, an embodiment of the utility model provides a heavy metal ion rapid detection platform, which comprises a microfluidic detection chip, an electrochemical workstation, a mobile PC, a peristaltic pump and a liquid container to be detected; wherein:
the microfluidic detection chip consists of a microfluidic unit and a three-electrode sensor; the micro-fluidic unit comprises a micro-channel inside, and a liquid inlet pipeline and a liquid outlet pipeline are respectively arranged at two ends of the micro-channel; the three-electrode sensor comprises a card-shaped bottom plate and three electrodes fixed on the bottom plate, namely a working electrode, an auxiliary electrode and a reference electrode; one end of the bottom plate is provided with an interface area, and three contact pins at the ends of the three electrode lead wires are arranged in the interface area; the bottom of the micro-channel is communicated with an electrode slot matched with the three-electrode sensor, the three-electrode sensor is inserted into the electrode slot, the three electrodes enter the micro-channel, and the interface area is reserved outside the electrode slot; a first hose is connected between the liquid container to be detected and the liquid inlet pipeline, and the peristaltic pump is arranged on the first hose; the contact pins of the three electrodes are respectively connected with corresponding electrode connecting ends on the electrochemical workstation; and the mobile PC is connected with the electrochemical workstation for detection control and data acquisition.
Preferably, the heavy metal ion rapid detection platform further comprises a waste liquid container, and the liquid outlet pipeline of the micro-fluidic unit is communicated with the waste liquid container through a second hose to discharge waste liquid, so that secondary pollution caused by discharge of the waste liquid to the environment is avoided.
Preferably, the microchannel of the microfluidic unit is a saddle-shaped thin layer; further preferably, the liquid inlet pipeline and the liquid outlet pipeline are respectively connected to two saddle-shaped end parts of the microchannel and extend along the direction tangential to the end parts.
Preferably, the electrode connecting end of the electrochemical workstation is a USB interface, the interface area of the three-electrode sensor is arranged according to USB specification and directly inserted into the USB interface, the contact pins are respectively and correspondingly communicated with three pins of the USB interface, and a uniform USB standard interface is adopted to facilitate the connection between the electrodes and the electrochemical workstation.
The utility model discloses above-mentioned technical scheme of embodiment provides portable heavy metal ion short-term test platform through combining together micro-fluidic technique and ASV, and its beneficial effect is as follows:
the device has the advantages of high integration level, portability and easy use, adopts the microfluidic detection chip, has the characteristics of sensitive detection, high accuracy and high detection efficiency, is particularly suitable for on-site rapid detection of heavy metal ions in a solution, and leads the development trend of future ASV heavy metal ion detection.
Drawings
FIG. 1 is a schematic diagram of the ASV detection principle;
fig. 2 is a schematic structural view of a heavy metal ion rapid detection platform provided in an embodiment of the present invention;
FIG. 3 is a schematic perspective view of a microfluidic detection chip in the rapid detection platform for heavy metal ions in FIG. 2;
FIG. 4 is a cross-sectional view of the microfluidic detection chip A-A of FIG. 3;
fig. 5 is a schematic structural view of a heavy metal ion rapid detection platform with USB connection according to another embodiment of the present invention;
fig. 6 is a schematic diagram of an interface area of a three-electrode sensor matching with a USB interface according to an embodiment of the present invention.
[ main component symbol description ]
1-microfluidic detection chip; 11-a microfluidic cell; 110-a microchannel; 111-electrode slots; 112-a liquid inlet pipeline; 113-a liquid outlet pipe; 12-a three-electrode sensor; 120-a backplane; 121-a working electrode; 122-auxiliary electrodes; 123-reference electrode; 124-interface region; 12 f-contact pin;
2-an electrochemical workstation; 21-a USB interface;
3-mobile PC;
4-a peristaltic pump;
5-a liquid container to be detected;
61-a first hose; 62-a second hose;
7-waste liquid container.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model discloses to current problem, provide a heavy metal ion rapid detection platform who combines together micro-fluidic technique and ASV.
The ASV detection step is divided into two processes of reduction pre-electrolysis enrichment and reverse oxidation electrolysis stripping, as shown in figure 1, the voltammetry characteristic in the working process of the ASV is indicated, firstly, a constant reduction negative voltage is applied to the surface of a working electrode, and metal ions M with reduction potential higher than the voltage are reducedn+Reducing the metal elementary substance M on the surface of the working electrode to enrich, wherein the enrichment amount is in direct proportion to the time of applying voltage and the concentration of metal ions, and measuring the current between the electrodes to obtain an enrichment voltammetry curve in a positive area of a longitudinal axis in the figure 1; applying a positive scanning voltage on the working electrode, and oxidizing the enriched metal simple substance M into ions M againn+And stripping, recording current and potential to obtain stripping voltammetry curve in the negative area of the vertical axis in FIG. 1, and obtaining peak current i from stripping voltammetry curvepUnder the premise of controlling all operation conditions of electrolyte base liquor, electrode, pressurization parameter and the like to be highly consistent, each metal has specific oxidation or dissolution peak potential and peak current ipThe size of the metal ion is in linear positive correlation with the concentration of the metal ion in the solution to be detected, and therefore qualitative and quantitative analysis is carried out on the content of the heavy metal in the solution.
In order to realize above-mentioned technical scheme, as shown in fig. 2 to fig. 4, the embodiment of the utility model provides a heavy metal ion rapid detection platform, include: the device comprises a micro-fluidic detection chip 1, an electrochemical workstation 2, a mobile PC3, a peristaltic pump 4 and a liquid container 5 to be detected; wherein:
the microfluidic detection chip 1 consists of a microfluidic unit 11 and a three-electrode sensor 12; the micro-fluidic unit 11 comprises a micro-channel 110, and both ends of the micro-channel 110 are respectively provided with a liquid inlet pipeline 112 and a liquid outlet pipeline 113; the three-electrode sensor 12 includes a card-shaped base plate 120 and three electrodes fixed on the base plate 120, namely, a working electrode 121, an auxiliary electrode 122 and a reference electrode 123; one end of the bottom plate 120 is provided as an interface area 124, and three contact pins 12f at the ends of the three electrode lead wires are arranged in the interface area 124; the bottom of the micro-channel 110 is open and is communicated with the electrode slot 111 matched with the three-electrode sensor 12, the three-electrode sensor 12 is inserted into the electrode slot 111, three electrodes enter the micro-channel 110, and the interface area 124 is left outside the electrode slot 111; a first hose 61 is connected between the liquid container 5 to be detected and the liquid inlet pipe 112, a peristaltic pump 4 is arranged on the first hose 61, and the peristaltic pump 4 drives the solution to be detected in the liquid container 5 to be detected to flow into the micro-channel 110 through the first hose 61; the contact pins 12f of the three electrodes are respectively connected with the corresponding electrode connecting ends on the electrochemical workstation 2, voltage is applied to the auxiliary electrodes by the electrode connecting ends, and the current between the electrode loops is detected; the mobile PC3 is connected with the electrochemical workstation 2 for detection control and data acquisition.
The three-electrode sensor 12 is an all-solid-state planar electrode, can effectively overcome the defects that the ion selective electrode used only in the traditional ASV is inconvenient to carry, can not be inverted and can not resist high temperature and high voltage, and has the advantages of short enrichment time, high voltage scanning speed, automatic compensation of iR drop, reduction of impurity ion interference and the like.
The microfluidic detection chip is applied to the microfluidic technology, and can effectively overcome the defects of the traditional ASV device in detection. The idea of microfluidic technology is to integrate the traditional classical analysis method and detection unit into one device, so that each process of analysis and detection is integrated into one chip sensor according to the flow, and the final aim is to construct a chip laboratory based on microfluidic chip for integrated chemical analysis of each operation process. The small size of the microchannel in the microfluidic device not only enables the analysis equipment to be miniaturized on the whole size, but also brings about a plurality of micro and nano effects, so that the analysis performance is remarkably improved compared with the traditional analysis system; as the dimensions of microchannels decrease, the thermal conductivity and heat transfer rate of the channels will increase significantly, allowing for rapid analysis, separation, or other more complex manipulation of samples; the reduction of the size of the micro-channel can also lead the consumption of manufacturing materials to be less, meet the requirement of the reduction of the controllability of the cost of the chip sensor after the batch production and be beneficial to the commercialization of the chip; in addition, the reduction of the size of the micro-channel enables the consumption of samples and reagents in the analysis and detection of the micro-fluidic device to be reduced, and provides conditions for obtaining extremely high unit information quantity through parallel analysis.
As shown in fig. 3 and 4, the microchannel 110 is a saddle-shaped thin layer, and on the premise that the microchannel 110 is a thin layer, the two-dimensional shape thereof can be saddle-shaped, rectangular, oval, and other shapes, and in order to further improve the efficiency of the action of the three-electrode pair on the solution flowing through, theoretical analysis and experiments prove that the saddle-shaped thin layer microchannel 110 is the best.
The connection positions and directions of the liquid inlet pipe 112 and the liquid outlet pipe 113 with the microchannel 110 are also selected in many ways to facilitate the solution to be measured to smoothly flow through the microchannel 110, as shown in fig. 3 and 4, when the microchannel 110 is a saddle-shaped thin layer, the liquid inlet pipe 112 and the liquid outlet pipe 113 are respectively connected to two ends of the saddle shape of the microchannel 110 and extend along the direction tangential to the ends.
As shown in fig. 5 and fig. 6, since the three-electrode sensor 12 of the microfluidic chip 1 needs to be connected to the electrochemical workstation 2, in order to further facilitate the electrode connection, the electrode connection end of the electrochemical workstation 2 can be set as the USB interface 21, and correspondingly, the interface area 124 of the three-electrode sensor 12 is designed to be a plug with standard USB specification. Since the standard USB port has four contact pins, and the three contact pins 12f of the electrode of the three-electrode sensor 12 are only three, it is only necessary to set the positions and sizes of the interface area 124 and the contact pins 12f, so that after the interface area 124 is inserted into the USB port 21, the three contact pins 12f are respectively contacted with three of the four contact pins in the USB port 21, as shown in fig. 6. Because USB is the most common communication interface, the design of the USB interface end can enable the connection between the electrode and the electrochemical workstation to be more convenient, and the rapid detection on site is convenient.
The heavy metal ion rapid detection platform shown in fig. 5 further includes a waste liquid container 7, and a liquid outlet pipe 113 of the microfluidic unit 11 is communicated with the waste liquid container 7 through a second hose 62 to discharge waste liquid, so as to avoid secondary pollution caused by discharge of waste liquid to the environment.
The basic process of detecting the specific heavy metal ions in the solution by the electrode-modified heavy metal ion rapid detection platform provided by the embodiment through an ASV method is as follows:
1. pretreatment of a solution to be detected: adding bismuth ions (Bi) into solution to be detected containing heavy metal ions3+) A solution and an acidic base solution;
2. heavy metal enrichment: applying a negative voltage between the working electrode and the reference electrode by the electrochemical workstation; opening a peristaltic pump, driving a solution to be detected to flow into a micro-channel through a liquid inlet pipeline, starting pre-electrolysis under the action of three electrodes, reducing heavy metal ions into metal simple substances, then enriching the metal simple substances on the surface of a working electrode, and discharging waste liquid through a liquid outlet pipeline; after the pre-electrolysis is finished, closing the peristaltic pump and standing the solution to be detected;
3. dissolving out heavy metal ions: applying a negative positive scanning voltage between the working electrode and the reference electrode by the electrochemical workstation, and dissolving out the heavy metal enriched on the working electrode again to form heavy metal ions;
4. recording the voltammetric characteristics: recording the current and the working electrode potential in the working electrode and auxiliary electrode loop in the stripping process to obtain a stripping voltammetry curve;
5. calculating the concentration of heavy metal ions: obtaining the peak current of the solution to be measured through stripping voltammetry curvei p Will bei p And comparing the peak current value detected by the standard sample with known concentration under the same condition, and calculating to obtain the concentration of the specific heavy metal ions in the solution to be detected.
In the above process, Bi is added into the solution to be measured3+The solution is used as electrolyte for pre-electrolysis, and Bi is enriched in the process of measuring trace heavy metal by ASV3+Reducing the metal Bi on the working electrode, combining the metal Bi with the reduced heavy metal to be detected to form a bismuth alloy film similar to amalgam, and adsorbing the bismuth alloy film on the surface of the working electrode, thereby forming peak current in the dissolution process. The bismuth film has the effect similar to that of a mercury film in the traditional mercury film electrode in ASV detection, and the bismuth film is used for replacing the mercury film, so that the pollution of the extreme toxicity of mercury to the environment can be avoided.
For the embodiments of the present invention, the common general knowledge of the known specific structures and characteristics in the schemes is not described too much; the embodiments are described in a progressive manner, technical features related to the embodiments can be combined with each other on the premise of not conflicting with each other, and the same and similar parts among the embodiments can be referred to each other.
In the description of the present invention, the terms "upper", "lower", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above embodiments are only used to illustrate the technical solution of the present invention and not to limit the same, although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify or equally replace the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the protection scope of the claims of the present invention.
Claims (5)
1. A heavy metal ion rapid detection platform is characterized by comprising a microfluidic detection chip (1), an electrochemical workstation (2), a mobile PC (3), a peristaltic pump (4) and a liquid container (5) to be detected; wherein:
the microfluidic detection chip (1) consists of a microfluidic unit (11) and a three-electrode sensor (12); the micro-fluidic unit (11) comprises a micro-channel (110), and two ends of the micro-channel (110) are respectively provided with a liquid inlet pipeline (112) and a liquid outlet pipeline (113); the three-electrode sensor (12) comprises a card-shaped bottom plate (120) and three electrodes fixed on the bottom plate (120), namely a working electrode (121), an auxiliary electrode (122) and a reference electrode (123); one end of the bottom plate (120) is provided with an interface area (124), and three contact pins (12 f) at the ends of the three electrode lead wires are arranged in the interface area (124); the bottom of the microchannel (110) is communicated with an electrode slot (111) matched with the three-electrode sensor (12), the three-electrode sensor (12) is inserted into the electrode slot (111), the three electrodes enter the microchannel (110), and the interface area (124) is left outside the electrode slot (111);
treat to survey liquid container (5) with connect first hose (61) between liquid inlet pipe (112), set up on first hose (61) peristaltic pump (4), three electrode touch foot (12 f) respectively with the electrode connection end that corresponds on electrochemical workstation (2) links to each other, remove PC (3) and connect electrochemical workstation (2) detect control and data acquisition.
2. The heavy metal ion rapid detection platform according to claim 1, further comprising a waste liquid container (7), wherein the liquid outlet pipeline (113) of the microfluidic unit (11) is communicated with the waste liquid container (7) through a second hose (62) to discharge waste liquid.
3. The platform for rapid detection of heavy metal ions according to claim 1, wherein the microchannel (110) of the microfluidic unit (11) is a saddle-shaped thin layer.
4. The rapid heavy metal ion detection platform according to claim 3, wherein the liquid inlet pipeline (112) and the liquid outlet pipeline (113) are respectively connected to two saddle-shaped ends of the microchannel (110) and extend along a direction tangential to the ends.
5. The heavy metal ion rapid detection platform according to any one of claims 1 to 4, wherein the electrode connection end of the electrochemical workstation (2) is a USB interface (21), the interface area (124) of the three-electrode sensor (12) is arranged according to USB specification and is directly inserted into the USB interface (21), and the contact pins (12 f) are respectively and correspondingly communicated with three contact pins of the USB interface (21).
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| CN202020787701.5U CN212364175U (en) | 2020-05-13 | 2020-05-13 | Heavy metal ion rapid detection platform |
| DE202021101425.3U DE202021101425U1 (en) | 2020-05-13 | 2021-03-19 | Rapid detection platform for heavy metal ions |
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| CN115436306A (en) * | 2022-09-21 | 2022-12-06 | 中国石油大学(华东) | Imidazoline corrosion inhibitor residual concentration detection device and detection method thereof |
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| CN112378734A (en) * | 2020-11-04 | 2021-02-19 | 成都理工大学 | Online enrichment system of trace heavy metal in environmental water |
| CN114509477A (en) * | 2021-12-29 | 2022-05-17 | 桐庐雷泰生物科技有限公司 | Electrochemical rapid detection equipment for capsaicin |
| CN115728373B (en) * | 2022-11-07 | 2024-05-28 | 中国科学院长春应用化学研究所 | Method for realizing multichannel electrochemical detection aiming at single-channel electrochemical workstation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436306A (en) * | 2022-09-21 | 2022-12-06 | 中国石油大学(华东) | Imidazoline corrosion inhibitor residual concentration detection device and detection method thereof |
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