Dual-channel ion concentration intelligent detection equipment

Abstract

The utility model discloses double-channel ion concentration intelligent detection equipment which comprises an equipment base, a pure water tank is arranged on the equipment base, one side of the pure water tank is communicated with an electrode box, one side of the electrode box is further communicated with a medicament box, and one side of the medicament box is communicated with an automatic dosing device. An automatic sampling device communicated with the electrode box is also arranged on the equipment base; a communicated waste liquid box is arranged on one side, far away from the automatic sampling device, of the electrode box; a pure water pump is arranged between the pure water tank and the electrode box, and a water inlet pump is arranged between the automatic sampling device and the electrode box; the electrode box comprises a fluorine ion selective electrode, a first reference electrode, a chloride ion selective electrode, a second reference electrode, a first PH meter and a second PH meter.

Description

Technical Field

[0001] This utility model belongs to the field of water quality analysis and testing technology, and more specifically, it relates to a dual-channel intelligent ion concentration detection device. Background Technology

[0002] Fluorine is an essential trace element for the human body, while chloride ions are not only widely present in nature but are also the most important and abundant anion in living organisms. In environmental monitoring, excessive fluoride / chloride ions in industrial wastewater and soil pollution can damage ecosystems; in drinking water safety, high fluoride concentrations can lead to fluorosis, while excessive chloride ions can affect drinking water quality (such as seawater intrusion); in industrial process control, the semiconductor and electroplating industries require precise detection of fluoride and chloride ion concentrations.

[0003] Traditional methods for fluoride ion detection include ion-selective electrode methods, spectrophotometry, and fluorescent probe methods. These methods suffer from drawbacks such as poor long-term stability, cumbersome procedures, and weak environmental adaptability. Traditional methods for chloride ion detection mainly include silver nitrate titration, ion chromatography, and electrochemical sensors. These methods are characterized by a lack of automation, expensive equipment, and susceptibility to interference. Furthermore, most existing detection technologies are limited to laboratory testing, failing to meet the needs of rapid on-site detection. The upgrading of emission standards for fluoride and chloride ion concentrations in water worldwide has driven the demand for online monitoring of fluoride and chloride ions. Traditional methods for fluoride and chloride ion detection rely on laboratory equipment, resulting in complex operations, long processing times, inability to provide real-time monitoring, and difficulties in multi-particle simultaneous detection. Therefore, there is an urgent need for intelligent, convenient, and highly sensitive solutions. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a dual-channel intelligent ion concentration detection device to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-channel intelligent ion concentration detection device, comprising a device base, a pure water tank mounted on the device base, an electrode tank connected to one side of the pure water tank, a reagent tank connected to one side of the electrode tank, an automatic dosing device connected to one side of the reagent tank, an automatic sample injection device connected to the electrode tank on the device base, and a waste liquid tank connected to the electrode tank on the side of the electrode tank away from the automatic sample injection device; a pure water pump is provided between the water blowing tank and the electrode tank, and a water inlet is provided between the automatic sample injection device and the electrode tank. The pump; the electrode box includes a fluoride ion selective electrode, a first reference electrode, a chloride ion selective electrode, a second reference electrode, a pH meter (number one), and a pH meter (number two); the reagent box includes a fluoride ion standard solution chamber, a chloride ion standard solution chamber, a total ionic strength adjusting buffer chamber, and an acid-base adjusting agent chamber; the automatic dosing device includes a fluoride ion standard solution pump connecting the fluoride ion standard solution chamber and the electrode box, a chloride ion standard solution pump connecting the chloride ion standard solution chamber and the electrode box, a buffer pump connecting the total ionic strength adjusting buffer chamber and the electrode box, and an acid-base adjusting pump connecting the acid-base adjusting agent chamber and the electrode box.

[0006] Preferably, the fluoride ion selective electrode is a LaF3 crystal film electrode with a hydrophobic molecular sieve layer on its surface; the chloride ion selective electrode is an Ag / AgCl solid electrode with a composite PVC film on its surface.

[0007] Preferably, a fluoride ion waste liquid pump and a chloride ion waste liquid pump are also provided between the waste liquid tank and the electrode tank.

[0008] Preferably, the device base is also provided with an intelligent control box for controlling the entire device, and the surface of the intelligent control box is provided with a fluoride ion concentration display.

[0009] This invention provides a dual-channel intelligent ion concentration detection device with the following advantages: based on ion-selective electrodes, it enables dual-channel detection of fluoride and chloride ions, and features automatic calibration, anti-interference capabilities, and concentration-segment standard curve switching. Compared with traditional detection methods, it has the advantages of long-term stability and detection accuracy, and is suitable for environmental monitoring, drinking water safety, and industrial wastewater detection. The process is controlled by an intelligent control system, which can simultaneously detect the concentrations of fluoride and chloride ions in the solution, realizing intelligent and automated detection of fluoride and chloride ion concentrations. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0011] Figure 2 This is a simplified circuit diagram of the dual-mode detection circuit for high and low concentrations of this utility model.

[0012] In the diagram: 1. Pure water tank; 1-1. Pure water pump; 2. Automatic sample injection device; 2-1. Inlet pump; 3. Electrode box; 3-1. Fluoride ion selective electrode; 3-2. First reference electrode; 3-3. Chloride ion selective electrode; 3-4. Second reference electrode; 3-5. pH meter No. 1; 3-6. pH meter No. 2; 4. Reagent tank; 4-1. Fluoride ion standard solution chamber; 4-2. Chloride ion standard solution chamber; 4-3. Total ionic strength adjustment buffer chamber; 4-4. Acid-base regulator chamber; 5. Automatic dosing device; 5-1. Fluoride ion standard solution pump; 5-2. Chloride ion standard solution pump; 5-3. Buffer pump; 5-4. Acid-base regulator pump; 6. Fluoride and chloride ion concentration display; 7. Waste liquid tank; 7-1. Fluoride ion waste liquid pump; 7-2. Chloride ion waste liquid pump; 8. Intelligent control box; 9. Equipment base. Detailed Implementation

[0013] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0014] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] Please see Figures 1 to 2 This utility model provides a technical solution: a dual-channel intelligent ion concentration detection device, such as... Figure 1As shown, the device includes a base 9, on which a pure water tank 1 is mounted. An electrode tank 3 is connected to one side of the pure water tank 1, and a reagent tank 4 is connected to one side of the electrode tank 3. An automatic dosing device 5 is connected to one side of the reagent tank 4. An automatic sample injection device 2, connected to the electrode tank 3, is also mounted on the base 9. A waste liquid tank 7, connected to the electrode tank 3, is located on the side of the electrode tank 3 furthest from the automatic sample injection device 2. A fluoride ion waste liquid pump 7-1 and a chloride ion waste liquid pump 7-2 are also installed between the waste liquid tank 7 and the electrode tank 3. A pure water pump 1-1 is installed between the pure water tank 1 and the electrode tank 3, and an inlet water pump 2-1 is installed between the automatic sample injection device 2 and the electrode tank 3.

[0017] Electrode box 3 includes a fluoride ion selective electrode 3-1, a first reference electrode 3-2, a chloride ion selective electrode 3-3, a second reference electrode 3-4, a pH meter 3-5 (No. 1), and a pH meter 3-6 (No. 2). Reagent box 4 includes a fluoride ion standard solution chamber 4-1, a chloride ion standard solution chamber 4-2, a total ionic strength adjusting buffer chamber 4-3, and an acid-base regulating agent chamber 4-4. Automatic dosing device 5 includes a fluoride ion standard solution pump 5-1 connecting the fluoride ion standard solution chamber 4-1 to electrode box 3, a chloride ion standard solution pump 5-2 connecting the chloride ion standard solution chamber 4-2 to electrode box 3, a buffer pump 5-3 connecting the total ionic strength adjusting buffer chamber 4-3 to electrode box 3, and an acid-base regulating pump 5-4 connecting the acid-base regulating agent chamber to electrode box 3. The fluoride ion selective electrode 3-1 is a LaF3 crystal film electrode with a hydrophobic molecular sieve layer on its surface; the chloride ion selective electrode 3-3 is an Ag / AgCl solid electrode with a composite PVC film on its surface.

[0018] A polytetrafluoroethylene rotor is placed in electrode box 3. After the electrode is inserted and stirred until the potential stabilizes, the potential value E is read while stirring continues. The potential value E is substituted into the calibration curve, and the intelligent control box's calculation system is used for data analysis and calculation to obtain the fluoride and chloride ion concentrations, which are then displayed on the fluoride and chloride ion concentration display. Ultrapure water is used as a blank, and the standard sample test method is followed. During measurement, this intelligent detection device ensures that the sample and standard solution temperatures, stirring speeds, and electrode insertion depths and positions below the liquid surface are consistent, improving the accuracy of the measurement results. Concentrations are measured in ascending order. After each sample is measured, the electrode is automatically cleaned to the blank value using pure water pump 1-1.

[0019] Electrode box 3 is connected to reagent box 4, which includes a fluoride ion standard solution chamber 4-1, a chloride ion standard solution chamber 4-2, a total ionic strength adjusting buffer chamber 4-3, and an acid-base adjusting agent chamber 4-4. The fluoride ion selective electrode 3-1 method offers fast measurement speed, but it also has high requirements for the measurement solution. The pH of the solution must be suitable, and other ions affecting the fluoride ion concentration must be controlled and easily removed. The standard solutions in fluoride ion standard solution chamber 4-1 and chloride ion standard solution chamber 4-2 can be added to electrode box 3 via an automatic dosing device 5. Acid-base adjusting agent 5-3 pump draws acid-base adjusting agent from acid-base adjusting agent chamber 4-3 into electrode box 3 to adjust the pH of the sample. The solution in acid-base adjusting agent chamber 4-3 is selected according to the acidity or alkalinity of the test solution; 0.1 mol / L HCl is selected for acidic solutions, and 1 mol / L NaOH is selected for alkaline solutions. The flow rate of the acid and alkali solutions is controlled by the pump flow rate to adjust the pH of the test solution to neutral.

[0020] The device is equipped with a dual-mode detection circuit for high and low concentrations, such as... Figure 2 As shown, the high-concentration mode uses a constant current method with a detection range of F = 10-1000 mg / L and Cl = 10-5000 mg / L; the low-concentration mode uses a constant potential method with a detection range of F = 0.1-10 mg / L and Cl = 1-10 mg / L, combined with a signal amplification circuit (adjustable gain). When detecting samples, the appropriate concentration mode is selected based on the ion concentration in the sample. The setup of the dual-mode detection circuit for high and low concentrations requires components such as a potential source, current source, amplifier, filter, and analog-to-digital converter. In the high-concentration mode using the constant current method, the constant current source provides a constant current, and the potential difference between the working electrode and the reference electrode is measured. The potential signal is amplified, filtered, and then converted into a digital signal by the analog-to-digital converter (ADC). In the low-concentration mode using the constant potential method, the constant potential source provides a constant potential, and the current between the working electrode and the reference electrode is measured. The current signal is amplified, filtered, and then converted into a digital signal by the ADC.

[0021] The equipment base 9 is also equipped with an intelligent control box 8, and the surface of the intelligent control box is equipped with a fluoride and chloride ion concentration display 6 for control connection.

[0022] The specific usage and function of this embodiment are as follows:

[0023] The detection process of this device is roughly as follows: the user selects the detection mode (high / low concentration) → the device automatically switches circuit parameters → the sample contacts the dual electrodes → the signal is differentially amplified → the concentration is calculated according to the preset standard curve → the result is displayed and stored on the LCD.

[0024] Before use, fluoride ion selective electrodes and chloride ion selective electrodes should be activated by soaking in 1 mol / L NaF solution for 4 hours, and then rinsed with distilled water until the potential is above approximately 300 mV, which is the blank potential of the electrode. When the measurement time is long and the electrode response value is low, it can be soaked in (1+1) hydrochloric acid for 30 seconds, rinsed, and then used.

[0025] First, a standard curve is plotted, which is done by measuring the potential values ​​of a series of standard solutions of fluoride and chloride ions at certain concentrations. To improve the accuracy of the results, two different standard curves can be plotted for low and high concentrations, respectively, to measure the water samples at high and low concentrations.

[0026] Fluoride and chloride ion standard solutions were prepared and placed in the fluoride and chloride ion standard solution chambers of reagent tank 4, respectively. The automatic dosing device 5 controlled the fluoride and chloride ion standard solution pumps to extract different volumes of fluoride and chloride ion standard solutions. 10 mL of total ion strength adjustment buffer solution was drawn from the total ion strength adjustment buffer chamber and added to the left chamber of electrode box 3 via a buffer pump. Then, ultrapure water was drawn from the pure water tank 1 using a pure water pump to dilute the standard solutions in both chambers of electrode box 3 to the mark. Standard solutions with different concentrations were set, including detection ranges of F-10-1000 mg / L and F-0.1-10 mg / L, and Cl-10-5000 mg / L and Cl-1-10 mg / L, respectively. A magnetic stirrer was turned on to ensure uniform stirring of the solutions. The potential values ​​of the standard solutions at different concentrations were measured using an ion-selective electrode. The calculation system of the intelligent control box recorded and stored the potential values ​​of the standard solutions at different concentrations.

[0027] Further, the preparation of the fluoride ion standard solution is as follows: accurately weigh 0.2210 g of NaF (pre-dried at 120℃ for 4 h), dissolve it in deionized water, and dilute to 100 mL. Each milliliter of this solution is equivalent to 1 mg of fluoride. The preparation of the chloride ion standard solution is as follows: accurately weigh 1.6485 g of NaCl (dried at 105℃ for 2 hours and cooled to room temperature) into a beaker, add a small amount of deionized water, stir until completely dissolved, and transfer to a 1000 mL volumetric flask and shake well.

[0028] (1) Plot the standard curves for fluoride ions and chloride ions on semi-logarithmic graph paper, with the logarithm of the fluoride / chloride ion concentration (lgC) on the x-axis and the corresponding potential value (E) on the y-axis. The slope of the standard curves should conform to the Nernst equation, that is, for every 10-fold change in concentration, the potential changes by 58.0 ± 2.1 mV.

[0029] Data analysis and calculations are performed using an intelligent control box, and regression equations are calculated based on standard curve data.

[0030] E = a + blgC

[0031] Where: E is the potential value (mV), a is the intercept, b is the slope, and C is the mass concentration of fluoride / chloride ions.

[0032] Two different standard curves, one for high concentration and one for low concentration, are calculated using the potential values ​​measured by the intelligent control box. Dual-mode detection circuits for high and low concentrations are then added according to these two standard curves. During sample testing, the appropriate detection mode is selected based on the actual concentration of the sample. Before each test, the intelligent control box's calculation system can initiate an automatic calibration process for the standard curves, further improving the accuracy of the test data.

[0033] (2) After the standard curve is plotted by the algorithm of the intelligent control box, the sample is measured. The pretreated sample is added to the left and right chambers of the electrode box 3 through the automatic injection device 2 and the injection pump, respectively. The high concentration mode or low concentration mode is selected according to the fluoride ion concentration of the test solution. The detection process is controlled by the intelligent control box to control the fluoride / chloride ion detection device. First, 10 mL of total ionic strength adjustment buffer solution TISAB(II) is automatically added to the left chamber of the electrode box 3 through the automatic dosing device 5. Finally, an appropriate amount of pure water is drawn from the pure water tank 1 through the pure water pump and added to the electrode box 3 to dilute the standard solution in the left and right chambers to 50 mL. Then, the acid-base adjuster is drawn from the acid-base adjuster chamber through the acid-base adjuster pump to adjust the pH of the test solution in the left and right chambers of the electrode box 3. The addition of acid-base adjuster is stopped when the pH meter shows that the pH is in the range of 6.0-7.0. The fluoride ion selective electrode and the reference electrode are inserted into the sample solution in the left chamber of electrode box 3, and the chloride ion selective electrode and the reference electrode are inserted into the sample solution in the right chamber of electrode box 3. A stirring device is set in electrode box 3, the stirrer is turned on, and the concentrations of fluoride ions and chloride ions are read at an appropriate stirring speed.

[0034] Potential values ​​are recorded in real time via electrodes, and these signals are processed by internal circuitry. After amplification and filtering, these signals are transmitted to the intelligent control box's computing system for further analysis. The intelligent control box calculates the fluoride and chloride ion concentrations by substituting the measured potential values ​​into a preset standard curve equation. Once the measurement is complete, the intelligent control box's computing system displays the calculated fluoride and chloride ion concentrations on the screen and stores the relevant data for subsequent analysis.

[0035] The intelligent control box's calculation system calculates the fluoride / chloride ion concentration value using the following formula:

[0036]

[0037] Where is the potential value of the sample, is the intercept obtained from the linear regression analysis, and is the slope.

[0038] After the testing process is completed, the waste liquid from the left and right chambers of electrode box 3 is discharged into waste liquid tank 7 through fluoride ion waste liquid pump and chloride ion waste liquid pump, respectively. At the same time, pure water is drawn out by pure water pump to rinse electrode box 3.

[0039] The entire process of the fluoride / chloride ion concentration detection equipment is controlled by an intelligent control box, which can simultaneously detect the concentrations of fluoride ions and chloride ions in the solution, realizing intelligent and automated detection of fluoride ion concentration and chloride ion concentration.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dual channel ion concentration smart detection device comprising a device base (9), characterized in that: The device base (9) is provided with a pure water tank (1), one side of the pure water tank (1) is communicated with an electrode tank (3), one side of the electrode tank (3) is also communicated with a reagent tank (4), one side of the reagent tank (4) is communicated with an automatic dosing device (5), the device base (9) is also provided with an automatic sampling device (2) communicated with the electrode tank (3), and the side of the electrode tank (3) away from the automatic sampling device (2) is provided with a waste liquid tank (7) in communication; the pure water tank (1) and the electrode tank (3) are provided with a pure water pump (1-1) in communication, and the automatic sampling device (2) and the electrode tank (3) are provided with a water inlet pump (2-1) in communication; the electrode tank (3) comprises a fluoride ion selective electrode (3-1), a first reference electrode (3-2), a chloride ion selective electrode (3-3), a second reference electrode (3-4), a first pH meter (3-5) and a second pH meter (3-6); the reagent tank (4) comprises a fluoride ion standard solution chamber (4-1), a chloride ion standard solution chamber (4-2), a total ionic strength adjusting buffer chamber (4-3) and an acid-base regulator chamber (4-4); the automatic dosing device (5) comprises a fluoride ion standard solution pump (5-1) in communication with the fluoride ion standard solution chamber (4-1) and the electrode tank (3), a chloride ion standard solution pump (5-2) in communication with the chloride ion standard solution chamber (4-2) and the electrode tank (3), a buffer pump (5-3) in communication with the total ionic strength adjusting buffer chamber (4-3) and the electrode tank (3), and an acid-base adjusting pump (5-4) in communication with the acid-base regulator chamber (4-4) and the electrode tank (3).

2. The dual-channel ion concentration intelligent detection device according to claim 1, characterized in that: The fluoride ion selective electrode (3-1) adopts a LaF3 crystal film electrode, and a hydrophobic molecular sieve layer is arranged on the surface of the electrode; the chloride ion selective electrode (3-3) adopts an Ag / AgCl solid electrode, and a composite PVC film is arranged on the surface of the electrode.

3. The dual-channel ion concentration intelligent detection device according to claim 1, wherein: The waste liquid tank (7) and the electrode tank (3) are also provided with a fluoride ion waste liquid pump (7-1) and a chloride ion waste liquid pump (7-2).

4. The dual-channel ion concentration intelligent detection device according to claim 1, wherein: The device base (9) is also provided with an intelligent control box (8) for controlling the whole device, and the surface of the intelligent control box (8) is provided with a fluoride and chloride ion concentration display (6).

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