Multi-channel water quality heavy metal ion detection device
Through the design of ion-sensitive sensors and multi-channel parallel structures, the problems of existing heavy metal online detection equipment that can only detect one ion at a time and have poor anti-interference capabilities are solved, and low-cost and high-accuracy simultaneous detection of multiple heavy metal ions is achieved.
Patent Information
- Application Number
- CN202422528467.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-18
AI Technical Summary
Existing online heavy metal detection equipment has the problems of only being able to detect one type of ion at a time, having poor anti-interference capabilities, and high costs for detecting multiple heavy metals simultaneously.
It adopts ion-sensitive sensors and multi-channel parallel structure design, and utilizes different ion-sensitive membrane electrodes to achieve high-accuracy detection of multiple heavy metal ions simultaneously in each channel.
It achieves low-cost and simultaneous detection of multiple heavy metal ions, reduces interference between ions, and improves detection accuracy.
Smart Images
Figure CN223413251U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heavy metal online detection. Background Art
[0002] Existing online heavy metal detection equipment typically uses spectrophotometry and electrochemistry. Spectrophotometry is the most widely used method. Its design is based on the reaction of certain heavy metal ions with specific chemicals to produce colored substances, which are then quantitatively analyzed according to the Lambert-Beer law. This method is simple in principle, and the online spectrophotometric design technology is very mature. However, this method generally only measures one ion per device. Currently, the detection limit of online water heavy metal detectors based on spectrophotometry is generally 10 μg / L, which is insufficient for low-concentration detection. Turbidity and colorimetry interfere with the quantification of colored substances, thus affecting the accuracy of the measurement results. Furthermore, inter-ion interference cannot be ignored. For example, dithizone is required for lead detection, but dithizone itself reacts chemically with various other heavy metals such as zinc, copper, and nickel to produce other colored chemicals. Therefore, dithizone alone is difficult to use for qualitative and quantitative analysis of water samples. Consequently, it suffers from low sensitivity, interference between color and turbidity, interference between metal ions, and the high risk of secondary products.
[0003] Electrochemical methods accurately quantify heavy metals in water based on electrical changes caused by chemical reactions on the electrode surface. They are currently an important environmental testing technology. Anodic stripping voltammetry and catalytic polarography are the main methods used for heavy metal detection in water quality. Electrochemical methods are relatively sensitive, with detection limits reaching μg / L or even lower. They are applicable to low-concentration heavy metal ions in areas such as surface water, drinking water, and drainage. However, since electrochemical detection essentially involves ion polarization and mass transfer at the electrode surface, complex water bodies contain various cations in addition to the target ions, which can lead to inter-ion interference. While the addition of masking agents can help, the water quality of environmental water bodies and polluted outlets is often complex and cannot completely mask inter-ion interference. Electrochemical methods are relatively sensitive and can be applied to low-concentration heavy metal ions in areas such as surface water, groundwater, drinking water, and drainage. However, the use of mercury film electrodes and dropping mercury electrodes poses the risk of secondary contamination. They also suffer from inter-ion interference. While the addition of masking agents can help, the water quality of environmental water bodies and polluted outlets is often complex and cannot completely mask inter-ion interference.
[0004] Inductively coupled mass spectrometry (ICP-MS) uses a high-frequency radio frequency signal applied to an inductive coil to form a high-temperature plasma within the coil. The carrier gas and atomized sample are then decomposed, excited, and ionized in the plasma torch region. The resulting positively charged ions then enter the mass spectrometer through an interface for qualitative and quantitative analysis based on their mass-to-nuclear ratio. This method is highly sensitive (with a detection limit of up to pg / L) and can simultaneously detect multiple heavy metal ions. Different heavy metal ions have different mass-to-nuclear ratios, eliminating inter-ion interference. However, the complex principles of ICPMS make it expensive and require high operator skills. Furthermore, the use of carrier gas, which consumes a lot of gas for online use, makes ICP-MS unsuitable for in-situ measurements in remote areas.
[0005] X-ray fluorescence spectrometry (XRF) uses an atomizer to atomize a water sample, which is then enriched and measured using an X-ray fluorescence spectrometer. The measurement principle is that ground-state atoms absorb radiation of a suitable specific frequency and are excited to a high-energy state. During the excitation process, X-ray fluorescence of a characteristic wavelength is emitted as light radiation, enabling qualitative and quantitative analysis. XRF can also detect a variety of heavy metal ions with high sensitivity. Because the X-rays generated by the transition and excitation of each metal ion are specific, there is no problem of inter-ion interference. However, the equipment is also expensive and requires a carrier gas.
[0006] Spectrophotometry and electrochemistry usually use one device to detect a single factor indicator. For situations where multiple factors are required, multiple detection devices are usually required. Among them, although traditional electrochemical electrodes can be used to simultaneously determine multiple heavy metal ions, the determination of a certain heavy metal ion using a mixed standard solution is very different from that using a single standard heavy metal ion, which often leads to inaccurate tests in actual applications. Currently, online water quality detection equipment using inductively coupled mass spectrometry (ICP-MS) and X-ray fluorescence spectrometry (XRF) has appeared on the market. It can detect multiple heavy metal ions simultaneously with high sensitivity and low inter-ion interference. However, it is usually expensive and complex to maintain, and has high operational requirements for personnel, so its application is not yet widespread.
[0007] In summary, the existing technology has the following defects:
[0008] 1) A single test can only detect one or a few ions: Existing spectrophotometric heavy metal detection equipment can only detect one ion; electrochemical heavy metal online detection equipment has ion interference with multiple ions, and generally detects a single ion. It is difficult to guarantee accuracy when measuring multiple ions at the same time.
[0009] 2) Poor anti-interference ability: Spectrophotometry and traditional electrochemical methods have inter-ion interference, which affects detection accuracy.
[0010] 3) The cost of online application of equipment for simultaneous detection of multiple heavy metals is high: ICP-MS and XRF technologies can detect multiple heavy metal ions online at the same time, but the cost is high, and the use of carrier gas also makes its operation and maintenance costs high. Due to the high complexity of the equipment, the operation and maintenance technology is difficult, the maintenance is complex, and professional technicians are required, making it difficult to apply it online. Utility Model Content
[0011] The utility model adopts an ion-sensitive sensor - loaded ion-sensitive membrane material. The ion-sensitive membrane material can specifically select a certain heavy metal ion. By utilizing a multi-channel parallel structural design and electrochemical detection principles, different ion-sensitive membrane electrodes are used in different channels to achieve simultaneous high-accuracy detection of multiple heavy metal ions.
[0012] The utility model provides a multi-channel water quality heavy metal ion detection device, comprising: a quantitative unit, a multi-way valve, a precision sample injector, a reaction pool, a circulation pump, a multi-way valve 1, an ion-sensitive sensor, a multi-way valve 2, and a detection device; the quantitative unit is provided with a liquid extraction port; the multi-way valve includes 9 independent interfaces, namely a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth interface, and a ninth interface; the precision sample injector is provided with an injection port and a sample outlet; the liquid extraction port of the quantitative unit is connected to the first interface of the multi-way valve; the multi-way valve 1 includes 5 inlets and 1 common port; the multi-way valve 1 includes 5 inlets and 1 common port; the reaction pool is provided with three injection ports and a liquid discharge port, the three The injection ports are respectively connected to the ninth interface of the multi-way valve, the outlet of the precision sampler, the common port of the multi-way valve 2 and the inlet of the circulation pump; the circulation pump is provided with an inlet and an outlet, and the outlet of the circulation pump 14 is connected to the common port of the multi-way valve 15; the ion-sensitive sensor includes: 5 channels, a working electrode, a reference electrode and an auxiliary electrode; the microchannel pressing block has 5 micro chambers; the chamber is arranged in the middle of each channel, and the lower end inlet and the upper end outlet of the channel are provided at both ends of the chamber; the lower end inlet of each channel is connected to the outlet of the multi-way valve 1, and the upper end outlet of the channel is connected to the inlet of the multi-way valve 2; the detection device is respectively connected to the working electrode, the reference electrode and the auxiliary electrode.
[0013] Furthermore, it also includes: a standard solution bottle; the standard solution bottle is connected to the precision sample injector.
[0014] Furthermore, a stirring device is provided in the reaction tank.
[0015] Furthermore, it also includes: a waste liquid barrel, which is connected to the eighth interface of the multi-way valve and the drain port of the reaction tank respectively.
[0016] Furthermore, a drain valve is provided on the connecting pipe between the waste liquid barrel and the reaction tank.
[0017] Furthermore, it also includes: reagent bottle one, reagent bottle two, reagent bottle three, a cleaning bottle, and a water sample cup; the third interface of the multi-way valve is connected to reagent bottle one through a pipeline; the fourth interface of the multi-way valve is connected to reagent bottle two through a pipeline; the fifth interface of the multi-way valve is connected to reagent bottle three through a pipeline; the sixth interface of the multi-way valve is connected to the cleaning bottle through a pipeline; and the seventh interface of the multi-way valve is connected to the water sample cup through a pipeline.
[0018] Furthermore, membranes of different heavy metal ions are provided on the working electrode.
[0019] The utility model also provides a multi-channel water quality heavy metal ion detection method, comprising the following steps: first, cleaning; the cleaning comprises: a quantitative unit extracts cleaning water into a reaction pool, a stirring device starts stirring to clean the reaction pool, the stirring device stops working, a circulation pump passes the cleaning water in the reaction pool through a multi-way valve 1, an ion-sensitive sensor channel, and a multi-way valve 2, and the cleaning water is discharged to a waste liquid bucket through a drain valve; second, detecting the dissolution current baseline signal of the liquid to be tested; the detection of the dissolution current baseline signal of the liquid to be tested comprises: a quantitative unit extracts the liquid to be tested of reagent 1, reagent 2, or reagent 3 into the reaction pool, a stirring device mixes the liquid in the reaction pool, the stirring device stops working after mixing, the circulation pump circulates the liquid to be tested to the ion-sensitive sensor channel, and a constant voltage is applied to the working electrode to enrich the liquid. After a certain period of time, a reverse voltage is applied to the heavy metal ions to dissolve from the ion-sensitive membrane, and the detection unit detects the dissolution current baseline signal; the third detection standard solution dissolution current baseline signal; the detection standard solution dissolution current baseline signal includes: a precision sampler extracts a quantitative heavy metal standard solution into a reaction tank, a stirring device mixes the reaction tank liquid, the stirring device stops working after mixing, and the circulation pump is turned on. The circulation pump circulates the standard solution to the ion-sensitive sensor channel, and after a certain period of time, a constant voltage is applied to the working electrode to enrich the heavy metal ions, and a reverse voltage is applied to the heavy metal ions to dissolve from the ion-sensitive membrane, and the detection unit detects the dissolution current signal of the standard solution; fourth, based on the dissolution current baseline signal of the test liquid and the dissolution current baseline signal of the standard solution, the concentration of the heavy metal ion to be measured in the water sample is obtained.
[0020] The solution of the utility model addresses the problems that existing electrochemical online detection instruments cannot measure multiple ions simultaneously and have poor anti-interference ability. By utilizing ion-sensitive membranes and multi-channel design, the purpose of online detection is achieved with low cost, simultaneous measurement of multiple heavy metal ions, anti-interference, and improved detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a diagram of a multi-channel water quality heavy metal ion detection device.
[0022] Figure 2 This is a structural diagram of a multi-channel ion-sensitive sensor.
[0023] Figure 3 This is the plan view of the multi-channel ion sensor circuit board. DETAILED DESCRIPTION
[0024] The present invention can solve one or more of the above problems. It uses an ion-sensitive sensor loaded with an ion-sensitive membrane material that can specifically select certain heavy metal ions. Utilizing a multi-channel parallel structure design and electrochemical detection principles, different ion-sensitive membrane electrodes in different channels can achieve simultaneous and high-accuracy detection of multiple heavy metal ions.
[0025] Multi-channel parallelism: Multiple substances are detected simultaneously on multiple parallel channels.
[0026] Ion-sensitive sensor: an electrode structure loaded with ion-sensitive membrane material.
[0027] Example
[0028] The utility model provides a multi-channel ion-sensitive sensor water quality heavy metal ion simultaneous online detection system, comprising: a quantitative unit 1, a multi-way valve 2, a reagent bottle 1 3, a reagent bottle 2 4, a reagent bottle 3 5, a cleaning bottle 6, a water sample cup 7, a waste liquid bucket 8, a standard solution bottle 9, a precision injector 10, a reaction pool 11, a stirring device 12, a drain valve 13, a circulation pump 14, a multi-way valve 1 15, an ion-sensitive sensor 16, a multi-way valve 2 17, and a detection device 18.
[0029] The quantitative unit 1 is composed of a peristaltic pump and a photoelectric quantitative device. The peristaltic pump extracts liquid by stopping at the photoelectric quantitative sensor. The quantitative unit 1 is provided with a liquid extraction port, and the liquid extraction port of the quantitative unit 1 is connected to the first interface 021 of the multi-way valve 2 through a pipeline.
[0030] The multi-way valve 2 includes 9 independent interfaces, namely a first interface 021 , a second interface 022 , a third interface 023 , a fourth interface 024 , a fifth interface 025 , a sixth interface 026 , a seventh interface 027 , an eighth interface 028 , and a ninth interface 029 . The second interface 022 of the multi-way valve 2 is connected to the air through a pipeline, and the third interface 023 of the multi-way valve 2 is connected to the reagent bottle 1 3 through a pipeline, and the reagent bottle 1 contains the reagent 1; the fourth interface 024 of the multi-way valve 2 is connected to the reagent bottle 2 4 through a pipeline, and the reagent bottle 2 contains the reagent 2; the fifth interface 025 of the multi-way valve 2 is connected to the reagent bottle 3 5 through a pipeline, and the reagent bottle 3 contains the reagent 3; the sixth interface 026 of the multi-way valve 2 is connected to the cleaning bottle 6 through a pipeline, and the cleaning bottle is filled with cleaning water, which should generally be ultrapure water; the seventh interface 027 of the multi-way valve 2 is connected to the water sample cup 7 through a pipeline, and the water sample cup is filled with the sample to be tested; the eighth interface 028 of the multi-way valve 2 is connected to the waste liquid barrel 8 through a pipeline, and the waste liquid barrel is used to hold wastewater and waste liquid; the ninth interface 029 of the multi-way valve 2 is connected to the reaction tank 11 through a pipeline; the multi-way valve realizes the extraction and discharge of air, reagents, water samples, cleaning water and the discharge of waste liquid through the switching valve.
[0031] The waste liquid barrel 8 is connected to the eighth interface 028 of the multi-way valve.
[0032] The reaction tank 11 is provided with three injection ports on the top and a discharge port on the bottom; the discharge port is connected to a discharge valve 13 through a pipeline, and the discharge valve 13 is connected to a waste liquid bucket 8 through a pipeline. After the valve is opened, the liquid in the reaction tank is discharged into the waste liquid bucket by gravity. The three injection ports of the reaction tank 11 are respectively connected with the ninth interface 029 of the multi-way valve, the sample outlet of the precision injector 10, the common port of the multi-way valve 2 and the inlet of the circulating pump 14. The reaction tank 11 is also connected to the waste liquid bucket 8 through the discharge valve 13. A stirring device 12 is also provided in the reaction tank 11. The stirring device 12 is composed of a motor and a stirrer, and the stirrer is placed in the reaction tank 11 inside. The stirring motor is arranged at the bottom of the reaction tank, and the stirring motor rotates and drives the stirrer to rotate, thereby mixing and flowing the liquid in the reaction tank.
[0033] The precision sampler 10 is composed of a valve and an injection pump or a plunger pump. The precision sampler is provided with an inlet and an outlet. The inlet of the precision sampler 10 is connected to the standard liquid bottle 9 through a pipeline, and the outlet of the precision sampler 10 is connected to the first inlet of the reaction tank 11 through a pipeline. The inlet and the outlet are connected to the injection pump or the plunger pump through a valve. When the injection pump or the plunger pump extracts, the valve opens the inlet to extract the standard liquid. When the injection pump or the plunger pump discharges, the valve opens the outlet to discharge the liquid into the reaction tank 11.
[0034] The circulation pump 14 is provided with an inlet and an outlet. The inlet of the circulation pump 14 is connected to the third sample inlet of the reaction cell 11 via a pipeline. The pipeline should be inserted into the bottom of the reaction cell 11 and should not interfere with the operation of the stirring device 12. The outlet of the circulation pump 14 is connected to the common port of the multi-way valve 15 via a pipeline. The multi-way valve 15 includes five outlets and one common port, namely the first outlet 151, the second outlet 152, the third outlet 153, the fourth outlet 154, and the fifth outlet 155; the common port serves as the inlet interface. The common port of the multi-way valve 15 is connected to the outlet of the circulation pump 14; each outlet is connected to the lower inlet of the corresponding channel of the ion-sensitive sensor. The outlet 151 of the multi-way valve 15 is connected to the lower inlet of the channel 161 of the ion-sensitive sensor 16 through a pipeline, and the upper outlet of the channel 161 of the ion-sensitive sensor 16 is connected to the inlet 171 of the multi-way valve 17 through a pipeline; the outlet 152 of the multi-way valve 15 is connected to the lower inlet of the channel 162 of the ion-sensitive sensor 16 through a pipeline, and the upper outlet of the channel 162 of the ion-sensitive sensor 16 is connected to the inlet 172 of the multi-way valve 17 through a pipeline; the outlet 153 of the multi-way valve 15 is connected to the lower inlet of the channel 163 of the ion-sensitive sensor 16 through a pipeline, and the upper outlet of the channel 163 of the ion-sensitive sensor 16 is connected to the inlet 171 of the multi-way valve 17 through a pipeline. The pipeline is connected to the inlet 173 of the multi-way valve 17; the outlet 154 of the multi-way valve 15 is connected to the lower inlet of the channel 164 of the ion-sensitive sensor 16 through the pipeline, and the upper outlet of the channel 164 of the ion-sensitive sensor 16 is connected to the inlet 174 of the multi-way valve 17 through the pipeline; the outlet 155 of the multi-way valve 15 is connected to the lower inlet of the channel 165 of the ion-sensitive sensor 16 through the pipeline, and the upper outlet of the channel 165 of the ion-sensitive sensor 16 is connected to the inlet 175 of the multi-way valve 17 through the pipeline; that is, the multi-way valve 15, the ion-sensitive sensor 16 and the multi-way valve 17 have a one-to-one correspondence, so that opening the valve realizes the connection of a certain channel.
[0035] The ion-sensitive sensor 16 includes five channels: a first channel 161, a second channel 162, a third channel 163, a fourth channel 164, and a fifth channel 165. Each channel has a lower inlet and an upper outlet. The lower inlet of each channel is connected to the outlet of multi-way valve one, and the upper outlet of each channel is connected to the inlet of multi-way valve two. The ion-sensitive sensor 16 also includes an electrode housing 19, a working electrode 20, a pressing block 21, a first O-ring 22, a circuit board 23, a reference electrode 24, an auxiliary electrode 25, a second O-ring 26, and a microchannel pressing block 27. The working electrode is provided with a membrane of different heavy metal ions. The ion-sensitive sensor comprises the electrode housing 19, the working electrode 20, the pressing block 21, the first O-ring 22, the circuit board 23, the reference electrode 24, the auxiliary electrode 25, the second O-ring 26, the microchannel pressing block 27, and ion-sensitive membrane material. The working electrode 20 is connected to the detection device through the exposed copper column wire on the top of the electrode shell 19. The bottom is covered with the working electrode 20 and the lower plane of the working electrode is flush with the lower plane of the electrode shell. The working electrode 20 is an electrode that directly participates in the electrochemical reaction. The lower surface of the working electrode is covered with an ion-sensitive membrane material by drip coating or electroplating. The lower part of the electrode shell 19 has an external thread. The interface with internal threads is provided at multiple positions, and the electrode shell 19 is rotated to the pressing block 21 by threaded connection until the lower end of the working electrode 20 extends out of the thickness of the circuit board 23. The pressing block 21 and the circuit board 23 are fixedly connected as one; the first O-ring 22 is put on the bottom of the electrode shell 19, and the protruding part of the working electrode is just stuck in the center through hole of the auxiliary electrode 25. The microchannel pressing block 27 has five micro-chambers. Second O-rings 26 are pressed around the top of each chamber. Screws secure the pressing block 21, first O-ring 22, circuit board 23, second O-ring 26, and microchannel pressing block 27. Each micro-chamber is topped with a corresponding auxiliary electrode 25 and working electrode 20. The first and second O-rings seal the junctions. The chambers have inlet and outlet ports at either end, representing the first, second, third, fourth, and fifth channels 161, 162, 163, 164, and 165 of the ion-sensitive sensor. Ring-shaped auxiliary electrodes 25 are welded to the circuit board 23. These electrodes form a circuit with the working electrodes, driving the electrochemical reaction. A solid-state reference electrode 24 is also bonded to each auxiliary electrode 25. The reference electrode provides a stable potential reference for measuring the potential of the working electrode. Wires from the circuit board lead to the auxiliary and reference electrodes, which are connected to the detection device 18.
[0036] The second multi-way valve 17 includes five inlets and a common port: a first inlet 171, a second inlet 172, a third inlet 173, a fourth inlet 174, and a fifth inlet 175. The common port serves as the outlet port. The common port of the second multi-way valve 17 is connected to the second inlet of the reaction cell 11 via a pipeline. Liquid circulation and detection within the ion-sensitive sensor are achieved by activating the circulation pump 14, the first multi-way valve 15, the ion-sensitive sensor 16, and one or more channels of the second multi-way valve 17.
[0037] The detection device 18 is composed of a circuit board and a program, which are respectively connected to the working electrode, the reference electrode and the auxiliary electrode for processing signals and calculating results.
[0038] The specific detection methods are as follows:
[0039] 1. After receiving the detection control signal, the instrument starts the cleaning process
[0040] The quantitative unit draws cleaning water into the reaction tank, the stirring device starts stirring to clean the reaction tank, the stirring device stops working, and the circulation pump passes the cleaning water in the reaction tank through the multi-way valve 1, the ion-sensitive sensor channel, and the multi-way valve 2 to clean the entire device. The cleaning water returns to the reaction tank after cleaning and is discharged to the waste liquid barrel through the drain valve by gravity.
[0041] 2. Detect the dissolution current baseline signal of the test solution
[0042] The quantitative unit extracts the test liquid of reagent one, reagent two or reagent three (reagent one, reagent two and reagent three are different electrolyte solutions, usually three electrolyte solutions can test 5 heavy metal ions) into the reaction pool, and the stirring device mixes the liquid in the reaction pool. After mixing, the stirring device stops working and the circulation pump is turned on. The circulation pump circulates the test liquid to the ion-sensitive sensor channel. After a constant voltage is applied to the working electrode for enrichment for a certain period of time, a reverse voltage is applied to the heavy metal ions to dissolve from the ion-sensitive membrane, and the detection unit detects the dissolution current baseline signal of the test liquid.
[0043] Drain all the test liquid in the device into the waste liquid bucket through the reaction tank.
[0044] 4. Detect the dissolution current baseline signal of the standard solution
[0045] The precision sampler draws a quantitative heavy metal standard solution into the reaction pool, and the stirring device mixes the liquid in the reaction pool. After mixing, the stirring device stops working and the circulation pump is turned on. The circulation pump circulates the standard solution to the ion-sensitive sensor channel. After a constant voltage is applied to the working electrode for enrichment for a certain period of time, a reverse voltage is applied to dissolve the heavy metal ions from the ion-sensitive membrane, and the detection unit detects the dissolution current signal of the standard solution.
[0046] 5. Obtain the concentration of heavy metal ions to be measured in the water sample
[0047] The detection device calculates the concentration of the heavy metal ions to be measured in the water sample according to the measured dissolution current baseline signal of the liquid to be tested and the dissolution current baseline signal of the standard solution.
[0048] Depending on the type of heavy metal to be measured, the above process is repeated until all heavy metal ions are measured.
[0049] The instrument performs the cleaning process again. The quantitative unit draws cleaning water into the reaction pool. The stirring device is turned on to clean the reaction pool. The stirring device stops working, the circulation pump is turned on, and all interfaces of multi-way valve 1 and multi-way valve 2 are opened. The cleaning water circulates to clean the channel of the ion-sensitive sensor to be tested. After cleaning with the cleaning water, the drain valve is opened to discharge the cleaning water by gravity.
[0050] The process ends.
[0051] The solution of the utility model has the following advantages:
[0052] 1) The utility model adopts a multi-channel parallel detection method for detection. Different types of ion-sensitive sensors are used in each channel, which can achieve simultaneous measurement of multiple heavy metal ions in a single detection.
[0053] 2) The utility model controls the multi-channel electromagnetic valve to detect different ions in different ion-sensitive sensor channels. Ion-sensitive membrane materials are configured in each channel to improve the selectivity of characteristic heavy metal ions. At the same time, different channels are not interconnected, which greatly reduces ion interference.
[0054] 3) This new method is based on traditional electrochemical methods and combines them with ion-sensitive sensors. It is low-cost, simple in principle, and suitable for online detection applications. This new method can achieve multi-channel parallel detection of different heavy metal ions. The traditional electrochemical method combined with the new ion-sensitive sensor enables accurate online detection of multiple heavy metal ions.
Claims
1. A multi-channel water quality heavy metal ion detection device, characterized in that: include: Quantitative unit, multi-way valve, precision injector, reaction cell, circulation pump, multi-way valve 1, ion sensitive sensor, multi-way valve 2, detection device; The quantitative unit is provided with a liquid extraction port; The multi-way valve includes 9 independent interfaces, namely the first interface, the second interface, the third interface, the fourth interface, the fifth interface, the sixth interface, the seventh interface, the eighth interface, and the ninth interface; The precision sample injector is provided with a sample inlet and a sample outlet; The liquid extraction port of the quantitative unit is connected to the first interface of the multi-way valve; The multi-way valve 2 includes 5 inlets and 1 common port; The multi-way valve 1 includes 5 inlets and 1 common port; The reaction pool is provided with three sample inlets and a liquid discharge port, and the three sample inlets are respectively connected to the ninth interface of the multi-way valve, the sample outlet of the precision injector, the common port of the second multi-way valve and the inlet of the circulation pump; The circulating pump is provided with an inlet and an outlet, and the outlet of the circulating pump is connected to the common port of the multi-way valve; The ion-sensitive sensor comprises: five channels, a working electrode, a microchannel compact, a reference electrode, and an auxiliary electrode; the microchannel compact has five micro chambers; the chamber is arranged in the middle of each channel, and the lower inlet and upper outlet of the channel are arranged at both ends of the chamber; the lower inlet of each channel is connected to the outlet of the multi-way valve 1, and the upper outlet of the channel is connected to the inlet of the multi-way valve 2; The detection device is connected to the working electrode, the reference electrode and the auxiliary electrode respectively.
2. The multi-channel water quality heavy metal ion detection device according to claim 1, characterized in that: Also includes: Standard solution bottle; The standard solution bottle is connected to the precision sample injector.
3. The multi-channel water quality heavy metal ion detection device according to claim 1, characterized in that: A stirring device is provided in the reaction tank.
4. The multi-channel water quality heavy metal ion detection device according to claim 1, characterized in that include: Waste liquid barrel The waste liquid bucket is connected to the eighth interface of the multi-way valve and the drain port of the reaction tank respectively.
5. The multi-channel water quality heavy metal ion detection device according to claim 4, characterized in that: A drain valve is also provided on the communicating pipe between the waste liquid barrel and the reaction tank.
6. The multi-channel water quality heavy metal ion detection device according to claim 1, characterized in that include: Reagent bottle 1, reagent bottle 2, reagent bottle 3, cleaning bottle, water sample cup; The third interface of the multi-way valve is connected to the reagent bottle 1 through a pipeline; The fourth interface of the multi-way valve is connected to the second reagent bottle through a pipeline; The fifth interface of the multi-way valve is connected to the reagent bottle three through a pipeline; The sixth interface of the multi-way valve is connected to the cleaning bottle through a pipeline; The seventh interface of the multi-way valve is connected to the water sample cup through a pipeline.
7. The multi-channel water quality heavy metal ion detection device according to claim 1, characterized in that: The working electrode is provided with membranes of different heavy metal ions.