A sodium ion measuring device

Abstract

The utility model relates to a kind of sodium ion determination devices, it includes inlet and outlet valve group, peristaltic pump, reaction kettle, quantitative pump, flow cell, sodium ion electrode and reference electrode;Inlet and outlet valve group includes two-position three-way valve Q1-Q6, the public end of Q1 is communicated with the normally open end of Q2, the public end of Q2 is communicated with the normally open end of Q3, and so on.The normally closed end of Q1 is air inlet, the normally open end of Q1 is pure water import, the normally closed end of Q2 is sample inlet, the normally closed end of Q3 is first standard solution import, the normally closed end of Q4 is second standard solution import, the normally closed end of Q5 is outlet;The normally closed end pipeline of Q6 is communicated flow cell, the public end of Q6 is communicated reaction kettle by peristaltic pump pipeline;Quantitative pump is communicated external reagent supply equipment, and quantitative pump is communicated reaction kettle;Sodium ion electrode and reference electrode are inserted into flow cell.The utility model has the advantages of short sample inlet pipeline, high measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of water quality testing technology, and in particular to a sodium ion measuring device. Background Technology

[0002] Sodium ion content needs to be determined in water samples such as desalinated water, boiler feedwater, steam, and condensate. For manufacturing enterprises, online sodium ion determination can provide real-time feedback of production data and offer effective process monitoring. The sodium ion selective electrode method (Na...) + Potentiometric electrochemical assay (ISE) is a potentiometric technique used to determine sodium ions (Na+) in solution. + To determine the concentration, this technique typically requires the use of a sodium ion selective electrode (sodium ion electrode for short) and a reference electrode.

[0003] When determining sodium ions, the amount of water sample and reagent used is usually small. However, most existing sodium ion measuring devices have the problem of long sample inlet pipes. This can cause water sample and reagents to stick to the inner wall of the pipe and not be fully introduced into the mixing tank (reaction vessel) for reaction, thus reducing the measurement accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a sodium ion measuring device with a short sample inlet tube and high measurement accuracy.

[0005] To achieve the above objectives, this utility model discloses a sodium ion measuring device, which includes an inlet / outlet valve assembly, a peristaltic pump, a reaction vessel, a metering pump, a flow cell, a sodium ion electrode, and a reference electrode. The inlet / outlet valve assembly includes two-position three-way valves Q1-Q6. The common terminal of two-position three-way valve Q1 is connected to the normally open terminal of two-position three-way valve Q2; the common terminal of two-position three-way valve Q2 is connected to the normally open terminal of two-position three-way valve Q3; the common terminal of two-position three-way valve Q3 is connected to the normally open terminal of two-position three-way valve Q4; the common terminal of two-position three-way valve Q4 is connected to the normally open terminal of two-position three-way valve Q5; and the common terminal of two-position three-way valve Q5 is connected to the normally open terminal of two-position three-way valve Q6. The normally open end of valve Q6 is connected to the air inlet, the normally open end of two-position three-way valve Q1 is the pure water inlet, the normally closed end of two-position three-way valve Q2 is the sample inlet, the normally closed end of two-position three-way valve Q3 is the first standard solution inlet, the normally closed end of two-position three-way valve Q4 is the second standard solution inlet, and the normally closed end of two-position three-way valve Q5 is the drain outlet; the normally closed end of two-position three-way valve Q6 is connected to the flow cell, and the common end of two-position three-way valve Q6 is connected to the reaction vessel via a peristaltic pump; the metering pump is connected to an external reagent supply device and is also connected to the reaction vessel; the sodium ion electrode and the reference electrode extend into the flow cell.

[0006] With the above setup, the inlet and outlet of liquids (excluding reagents) are controlled via an inlet / outlet valve assembly. The structure and flow path are compact. Reagents are pumped using a metering pump, allowing for precise control of the added amount. Furthermore, the reagent flow path is independent, eliminating the need to consider other sample inlet lines in the pipeline design. The reagent pipeline can be designed to be very short and also eliminates the need for rinsing. A peristaltic pump pumps the water sample or standard solution to the reaction vessel. After the water sample and reagents have reacted in the reaction vessel, the peristaltic pump pumps them in reverse to the flow cell for sodium ion detection. This process allows the reaction solution to re-mix and react with any residual water sample or standard solution in the sample inlet line, preventing loss of residual water sample or standard solution and thus improving measurement accuracy. In addition, the flow lines for water sample, standard solution, pure water, and outlet liquid are shared from Q6 to the reaction vessel, allowing for a more streamlined overall pipeline design.

[0007] Preferably, the reactor has a first inlet at the bottom and a second inlet and a spare waste pipe at the top, the spare waste pipe being connected to the atmosphere; the common end of the two-position three-way valve Q6 is connected to the first inlet of the reactor via a peristaltic pump pipe, and the metering pump is connected to the second inlet of the reactor. The first inlet being located at the bottom of the reactor facilitates complete drainage during rinsing, while the second inlet being located at the top of the reactor prevents contamination of the reagent outlet by water samples or standard solutions. The spare waste pipe being connected to the atmosphere facilitates pumping liquid into the reactor and can also be used as an overflow outlet to prevent overpressure in the reactor due to malfunction.

[0008] Preferably, the reaction vessel has a stirrer and a heater. This arrangement facilitates rapid completion of the reaction.

[0009] Preferably, the system further includes a two-position three-way valve Q7; the metering pump is an injection pump; the common end of the two-position three-way valve Q7 is connected to the inlet and outlet of the injection pump, the normally closed end of the two-position three-way valve Q7 is connected to an external reagent supply device, and the normally open end of the two-position three-way valve Q7 is connected to the reaction vessel. This configuration is simple in structure and facilitates quantitative control of the reagent.

[0010] Preferably, the system further includes a water sample detector connected in series on the pipeline connecting the peristaltic pump and the reactor, or the water sample detector connected in series on the pipeline connecting the common end of the two-position three-way valve Q6 to the peristaltic pump. The water sample detector is used to determine whether the inflow and outflow of liquids are normal.

[0011] Preferably, the flow cell has a first chamber, a second chamber, an inlet pipe, a connecting pipe, and an overflow pipe. One end of the inlet pipe is connected to the normally closed end of a two-position three-way valve Q6, and the other end is connected to the bottom of the first chamber. The middle section of the first chamber is connected to the bottom of the second chamber via the connecting pipe. One end of the overflow pipe is connected to the middle section of the second chamber, and the other end is connected to an external waste liquid pipe. The sodium ion electrode extends into the first chamber, and the reference electrode extends into the second chamber; or, the sodium ion electrode extends into the second chamber, and the reference electrode extends into the first chamber. With this configuration, the actual volume of the flow cell can be designed to be relatively small, which facilitates rapid filling of the flow cell with the reaction solution. When the overflow pipe begins to discharge liquid, it indicates that the flow cell has been completely filled, at which point electrode signal acquisition can be performed, improving detection efficiency.

[0012] Preferably, the device also includes a sensing tube and a pressure sensor. The overflow pipe is connected to an external waste liquid pipe via the sensing tube, and the end of the sensing tube near the overflow pipe presses against the pressure sensor. The outer wall of the flow tank is provided with a mounting platform for installing the pressure sensor. With this configuration, as long as the reaction liquid flowing out of the overflow pipe falls onto the sensing tube, it will be detected by the pressure sensor, thus providing a clear signal (indicating that the flow tank is full), which facilitates rapid response of the device.

[0013] Preferably, the overflow pipe is inclined downwards. With this configuration, when the liquid level reaches the upper port of the overflow pipe, overflow can be achieved quickly, allowing the pressure sensor to detect and respond to pressure changes more quickly, thus facilitating a rapid response from the device.

[0014] Preferably, the bottom of the second chamber is provided with a drain pipe, one end of which is connected to the bottom of the second chamber, and the other end of which is connected to an external waste liquid pipe or the normally closed end of a two-position three-way valve Q6; a control valve is provided on the drain pipe. With this configuration, the second chamber can be emptied more thoroughly, which is conducive to cleaning. A more thorough cleaning of the flow cell can also ensure the reliability of sodium ion detection.

[0015] Preferably, the two-position three-way valves Q1-Q6 are arranged sequentially from top to bottom. This arrangement allows gravity to be used to make the water sample flow downstream, which is beneficial for sample introduction.

[0016] This utility model has the following beneficial effects: This invention uses an inlet / outlet valve assembly to control the inlet and outlet of liquids (excluding reagents). Its structure and flow path are compact. Reagents are pumped using a metering pump, allowing for precise control of the amount added. Furthermore, the reagent flow path is independent, eliminating the need for other sample inlet lines in the pipeline design. The reagent pipeline can be designed to be very short and also eliminates the need for rinsing. A peristaltic pump pumps the water sample or standard solution to the reaction vessel. After the water sample and reagents have reacted in the reaction vessel, the peristaltic pump pumps them in reverse to the flow cell for sodium ion detection. This process allows the reaction solution to re-mix and react with any residual water sample or standard solution in the sample inlet line, preventing loss of residual water sample or standard solution and thus improving measurement accuracy. In addition, the flow lines for the water sample, standard solution, pure water, and outlet are shared from Q6 to the reaction vessel, further simplifying the overall pipeline design. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of Example 1.

[0018] Figure 2 This is a schematic diagram of the flow cell in Example 2.

[0019] Explanation of symbols for main components: 1. Peristaltic pump, 2. Water sample detector, 3. Reactor, 4. Injection pump, 5. Flow cell, 6. Sodium ion electrode, 7. Reference electrode, 8. First chamber, 9. Second chamber, 10. Inlet pipe, 11. Connecting pipe, 12. Overflow pipe, 13. Sensing tube, 14. Pressure sensor, 15. Drain pipe, 16. Mounting platform, 17. Control valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Example 1 like Figure 1 As shown in the figure, this embodiment discloses a sodium ion measuring device of the present invention, which includes an inlet and outlet valve group, a peristaltic pump 1, a water sample detector 2, a reaction vessel 3, a metering pump, a two-position three-way valve Q7, a flow cell 5, a sodium ion electrode 6, and a reference electrode 7.

[0022] The inlet and outlet valve assembly includes two-position three-way valves Q1-Q6, arranged sequentially from top to bottom. The common terminal of two-position three-way valve Q1 is connected to the normally open terminal of two-position three-way valve Q2; the common terminal of two-position three-way valve Q2 is connected to the normally open terminal of two-position three-way valve Q3; the common terminal of two-position three-way valve Q3 is connected to the normally open terminal of two-position three-way valve Q4; the common terminal of two-position three-way valve Q4 is connected to the normally open terminal of two-position three-way valve Q5; and the common terminal of two-position three-way valve Q5 is connected to the normally open terminal of two-position three-way valve Q6. The normally closed terminal of two-position three-way valve Q1 is configured as an air inlet, normally connected to atmospheric air to facilitate liquid flow. The normally open terminal of two-position three-way valve Q1 is configured as a pure water inlet, used to connect to pure water pipe H. The normally closed terminal of two-position three-way valve Q2 is configured as a sample inlet, used to connect to sample inlet pipe S. The normally closed end of the two-position three-way valve Q3 is configured as the inlet for the first standard solution, used to connect to the first standard solution tube C1 (concentration 100 ppb). The normally closed end of the two-position three-way valve Q4 is configured as the inlet for the second standard solution, used to connect to the second standard solution tube C2 (concentration 10 ppb). The normally closed end of the two-position three-way valve Q5 is configured as the drain port, used to connect to the waste liquid discharge pipe W1. The normally closed end of the two-position three-way valve Q6 is connected to the flow cell 5. The common end of the two-position three-way valve Q6 is connected to one end of the peristaltic pump 1 via a pipeline. The other end of the peristaltic pump 1 is connected to one end of the water sample detector 2 via a pipeline. The other end of the water sample detector 2 is connected to the reaction vessel 3. A first inlet for connecting to the water sample detector 2 is provided at the bottom of the reaction vessel 3.

[0023] A metering pump is connected to an external reagent supply device and also to a reaction vessel 3. A second inlet for connection to the metering pump is located at the top of the reaction vessel 3. In this design, a refractive pump is used, and it is coupled with a two-position three-way valve Q7 to control reagent extraction and pumping. Specifically, the common end of the two-position three-way valve Q7 is connected to the inlet and outlet of the syringe pump 4, the normally closed end of the two-position three-way valve Q7 is connected to an external reagent supply device (such as a reagent bottle), and the normally open end of the two-position three-way valve Q7 is connected to the second inlet of the reaction vessel 3. This configuration is simple and facilitates the quantitative control of reagent R1.

[0024] In order to facilitate the introduction of water samples into reactor 3, and to avoid the increase in internal pressure of reactor 3 due to accidental continuous liquid supply, a spare waste liquid pipe AW is also provided at the top of reactor 3. The spare waste liquid pipe AW connects the inner cavity of reactor 3 to the external atmosphere.

[0025] To facilitate the reaction of reagents with water samples or standard solutions, reaction vessel 3 is equipped with a stirrer and a heater. Additionally, to ensure that the reaction solution flows back into peristaltic pump 1 during the reaction, a valve should be installed at the first inlet.

[0026] The flow cell 5 has a first chamber 8, a second chamber 9, an inlet pipe 10, a connecting pipe 11, and an overflow pipe 12. One end of the inlet pipe 10 is connected to the normally closed end of a two-position three-way valve Q6, and the other end is connected to the bottom of the first chamber 8. The middle section of the first chamber 8 is connected to the bottom of the second chamber 9 via the connecting pipe 11. One end of the overflow pipe 12 is connected to the middle section of the second chamber 9, and the other end is connected to an external waste liquid pipe W2. The sodium ion electrode 6 extends into the first chamber 8, and the reference electrode 7 extends into the second chamber 9. With this configuration, the actual volume of the flow cell 5 can be designed to be relatively small, which facilitates the rapid filling of the flow cell 5 with the reaction solution. When the overflow pipe 12 begins to discharge liquid, it indicates that the flow cell 5 has been completely filled, at which point the electrode signal can be acquired, improving detection efficiency.

[0027] The detection process in this embodiment is as follows: 1. Drain: Drain the pure water stored in reactor 3 from W1.

[0028] 2. Sample rinsing: Turn on Q2 and peristaltic pump 1, extract a quantitative sample from tube S, push sample S into reactor 3, and turn off peristaltic pump 1 and Q2.

[0029] 3. Filling alkaline reagent R1: While the sample is being rinsed, the syringe pump 4 is activated, pushing the reagent inside the syringe pump 4 back into the reagent bottle, and then drawing the entire tube of reagent into the syringe pump 4.

[0030] 4. Sample evacuation: Turn on Q5, and the peristaltic pump 1 will discharge the washing sample in the reaction vessel 3 into the waste liquid tank through the W1 pipe.

[0031] 5. Sampling: Turn on Q2 and peristaltic pump 1, extract a quantitative sample from tube S, push the quantitative sample S into reactor 3, and turn off peristaltic pump 1 and Q2.

[0032] 6. Add alkali reagent R1 into reaction vessel 3 and mix. Use a heater to maintain the system at 45°C.

[0033] 7. The peristaltic pump 1 is activated, pushing the reaction solution into the flow cell 5 until liquid flows out of the overflow pipe 12. All actions are stopped, and the sodium ion electrode 6 reads the signal value.

[0034] 8. The concentration value measured was calculated based on the electrode signal value and linear relationship.

[0035] 9. After measurement, drain the liquid: Peristaltic pump 1 draws the liquid in flow cell 5 back into reactor 3, and then drains reactor 3.

[0036] 10. Cleaning the flow path: Pure water is drawn into reactor 3, and then flows from reactor 3 to flow cell 5. Finally, the liquid in sodium ion flow cell 5 is drawn back into reactor 3, which completes one cleaning cycle. The number of cleaning cycles can be set according to requirements.

[0037] 11. Analysis complete: After cleaning, the analyzer stops all operations and returns to standby mode, waiting for the next measurement.

[0038] The sample calibration procedure is the same as the sample analysis procedure, the only difference being that the first calibration solution C1, the second calibration solution C2, and sample S are extracted. The EC1 and EC2 values ​​corresponding to the two calibrations are used to calculate the electrode slope value kNa. Therefore, the sample concentration calculation formula is: With two calibration solution concentrations C1 = 100 ppb and C2 = 10 ppb, the electrical signal value corresponding to C1 is EC1, and the electrical signal value corresponding to C2 is EC2. According to y = kx + b, then:

[0039] After determining the electrode slope value, the value of b is obtained, and then the concentration value of the sample is calculated based on the measured electrical signal value ES of sample S.

[0040] Example 2 This embodiment modifies the flow cell 5 based on Embodiment 1. Specifically, as follows: Figure 2 As shown, the flow-through tank 5 is also equipped with a sensing tube 13, a pressure sensor 14, and a drain pipe 15. The overflow pipe 12 is inclined downwards to facilitate rapid liquid drainage. The lower end of the overflow pipe 12 is connected to the external waste liquid pipe W2 via the sensing tube 13. An installation platform 16 is set on the outer wall of the flow-through tank 5, and the pressure sensor 14 is installed on the installation platform 16. The end of the sensing tube 13 near the overflow pipe 12 is pressed against the pressure sensor 14. When the reaction liquid flowing out of the overflow pipe 12 falls into the sensing tube 13, it can be sensed by the pressure sensor 14, thus giving a clear signal (a signal indicating that the flow-through tank 5 is full), which facilitates the rapid response of the device.

[0041] The drain pipe 15 is located at the bottom of the second chamber 9. One end of the drain pipe 15 is connected to the bottom of the second chamber 9, and the other end is connected to the normally closed end of the external waste liquid pipe W2 or the two-position three-way valve Q6. A control valve 17 is installed on the drain pipe 15. When the reaction liquid is introduced into the flow tank 5, the control valve 17 is closed. During rinsing, when pure water flows out from the overflow pipe 12 and is sensed by the pressure sensor 14, the control valve 17 is opened to facilitate the complete drainage of the second chamber 9.

[0042] 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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sodium ion measuring device, characterized in that: The system includes an inlet / outlet valve assembly, a peristaltic pump, a reaction vessel, a metering pump, a flow cell, a sodium ion electrode, and a reference electrode. The inlet / outlet valve assembly includes two-position three-way valves Q1-Q6. The common terminal of two-position three-way valve Q1 is connected to the normally open terminal of two-position three-way valve Q2; the common terminal of two-position three-way valve Q2 is connected to the normally open terminal of two-position three-way valve Q3; the common terminal of two-position three-way valve Q3 is connected to the normally open terminal of two-position three-way valve Q4; the common terminal of two-position three-way valve Q4 is connected to the normally open terminal of two-position three-way valve Q5; and the common terminal of two-position three-way valve Q5 is connected to the normally open terminal of two-position three-way valve Q6. The normally closed end of valve Q1 is the air inlet; the normally open end of two-position three-way valve Q1 is the pure water inlet; the normally closed end of two-position three-way valve Q2 is the sample inlet; the normally closed end of two-position three-way valve Q3 is the first standard solution inlet; the normally closed end of two-position three-way valve Q4 is the second standard solution inlet; and the normally closed end of two-position three-way valve Q5 is the drain outlet. The normally closed end of two-position three-way valve Q6 is connected to the flow cell, and the common end of two-position three-way valve Q6 is connected to the reaction vessel via a peristaltic pump. The metering pump is connected to an external reagent supply device and is also connected to the reaction vessel. The sodium ion electrode and the reference electrode extend into the flow cell.

2. The sodium ion measuring device according to claim 1, characterized in that: The bottom of the reactor is provided with a first liquid inlet, the top of the reactor is provided with a second liquid inlet and a spare waste liquid pipe, and the spare waste liquid pipe is connected to the atmosphere; the common end of the two-position three-way valve Q6 is connected to the first liquid inlet of the reactor via a peristaltic pump pipeline, and the metering pump is connected to the second liquid inlet of the reactor.

3. The sodium ion measuring device according to claim 1, characterized in that: The reactor is equipped with a stirrer and a heater.

4. The sodium ion measuring device according to claim 1, characterized in that: It also includes a two-position three-way valve Q7; the metering pump is an injection pump; the common end of the two-position three-way valve Q7 is connected to the inlet and outlet of the injection pump, the normally closed end of the two-position three-way valve Q7 is connected to an external reagent supply device, and the normally open end of the two-position three-way valve Q7 is connected to the reaction vessel.

5. The sodium ion measuring device according to claim 1, characterized in that: It also includes a water sample detector, which is connected in series in the pipeline connecting the peristaltic pump and the reactor, or the water sample detector is connected in series in the pipeline connecting the common end of the two-position three-way valve Q6 to the peristaltic pump.

6. The sodium ion measuring device according to claim 1, characterized in that: The flow cell has a first chamber, a second chamber, an inlet pipe, a connecting pipe, and an overflow pipe. One end of the inlet pipe is connected to the normally closed end of a two-position three-way valve Q6, and the other end of the inlet pipe is connected to the bottom of the first chamber. The middle section of the first chamber is connected to the bottom of the second chamber through the connecting pipe. One end of the overflow pipe is connected to the middle section of the second chamber, and the other end of the overflow pipe is connected to an external waste liquid pipe. The sodium ion electrode extends into the first chamber, and the reference electrode extends into the second chamber; or, the sodium ion electrode extends into the second chamber, and the reference electrode extends into the first chamber.

7. The sodium ion measuring device according to claim 6, characterized in that: It also includes a sensing tube and a pressure sensor. The overflow pipe is connected to an external waste liquid pipe via the sensing tube, and one end of the sensing tube near the overflow pipe presses against the pressure sensor. The outer wall of the flow tank is provided with an installation platform for mounting the pressure sensor.

8. The sodium ion measuring device according to claim 7, characterized in that: The overflow pipe is set at an angle downwards.

9. The sodium ion measuring device according to claim 6, characterized in that: The bottom of the second chamber is provided with a drain pipe, one end of which is connected to the bottom of the second chamber, and the other end of which is connected to an external waste liquid pipe or the normally closed end of a two-position three-way valve Q6; a control valve is provided on the drain pipe.

10. The sodium ion measuring device according to claim 1, characterized in that: The two-position three-way valves Q1-Q6 are arranged sequentially from top to bottom.

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