CN211978799U - Titration cell for pH potentiometric titration - Google Patents
Titration cell for pH potentiometric titration Download PDFInfo
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- CN211978799U CN211978799U CN202020699686.9U CN202020699686U CN211978799U CN 211978799 U CN211978799 U CN 211978799U CN 202020699686 U CN202020699686 U CN 202020699686U CN 211978799 U CN211978799 U CN 211978799U
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Abstract
The utility model discloses a titration cell for pH potentiometric titration, including titrating the container, be equipped with the titration reaction chamber on the titration container, the side of titrating the container be provided with the tilting trompil and with titrate the reaction chamber intercommunication, be provided with the pH electrode in the tilting trompil titrate the reaction intracavity and be equipped with magnetic stirrers and salt bridge, the salt bridge with the pH electrode all is located magnetic stirrers's top. The utility model discloses a reference electrode and titration cell of integrated form adopt and instruct the pH electrode, have reduced the titration cell capacity, and the sample quantity is extravagant when avoiding titrating, reasonable control titration time.
Description
Technical Field
The utility model belongs to the technical field of the detection and specifically relates to a titration cell for pH potentiometric titration is related to.
Background
Potentiometric titration generally has high accuracy and precision, and because potentiometric titration measures the change of the electromotive force of the battery caused by adding a titrant, rather than the absolute value of the electromotive force, the measurement result is not influenced even if the slope of the electrode changes slightly. The change of the liquid junction potential and the activity coefficient is small, the potential jump near the equivalence point is large, and the end point is easy to be accurately determined, so that the potentiometric titration is widely applied to the measurement of the end point in the experiment at present. However, the current potentiometric titration device has certain limitations in the application process: the potentiometric titration speed is slow, which results in long analysis time, especially when an unknown sample is measured, how much titrant is consumed is unknown, the titrant cannot be pre-added in order to ensure the accuracy of titration, the titration time cannot be pre-estimated, and the titration speed cannot be accurately set, so that the potentiometric titration method is difficult to perform titration on the unknown sample in the actual titration process. There is therefore a need for a titration cell for pH potentiometric titration that effectively solves the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a titration cell for pH potentiometric titration,
in order to achieve the above object, the utility model adopts the following technical scheme:
the utility model discloses a titration vessel, titration vessel is last to be equipped with and to titrate the reaction chamber, titration vessel's side be provided with the tilting trompil and with titration reaction chamber intercommunication, be provided with the pH electrode in the tilting trompil titration reaction intracavity is equipped with magnetic stirrers and salt bridge, the salt bridge with the pH electrode all is located magnetic stirrers's top.
Furthermore, a cleaning liquid injection interface, a waste liquid discharge interface, a titration base liquid injection interface and a titration liquid injection interface are arranged on the titration container.
Further, a pH reference electrode is arranged on the titration cell, the pH reference electrode is of a U-shaped tube structure, an Ag/AgCl electrode is placed on one side, an electrolyte solution adding port is arranged on the other side, and the bottoms of the electrodes are communicated through a salt bridge fixing column.
Further, be provided with pH electrode lead-out wire on the pH electrode, be provided with the solid fixed ring of pH electrode on the pH electrode, the tail end of pH electrode be provided with pH electrode fixation nut with titration container is connected.
Further, the salt bridge is a porous ceramic salt bridge and is connected with the titration reaction cavity and the bottom of the U-shaped structure of the reference electrode.
Furthermore, a round concave hole is arranged at the bottom of the titration reaction cavity and used for positioning and installing the magnetic stirrer,
further, the pH electrode is a glass electrode.
Further, the salt bridge is arranged on the salt bridge fixing column and is connected with the titration reaction cavity through a salt bridge mounting nut.
Further, the pH electrode and the salt bridge are provided with sealing rings.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a reference electrode and titration cell of integrated form adopt and instruct the pH electrode, have reduced pH titration cell capacity, and it is extravagant to avoid the sample quantity when dripping.
Drawings
FIG. 1 is a perspective view of the titration cell of the present invention from the front and the top left;
FIG. 2 is a perspective view of the titration cell of the present invention from the right back and up;
fig. 3 is an exploded view of the present invention;
1. the device comprises a titration reaction cavity, 2 parts of an Ag/AgCl reference electrode mounting port, 3 parts of a reference electrode electrolyte adding port, 4 parts of a reaction cavity cleaning solution inlet, 5 parts of a reaction cavity waste liquid discharge port, 6 parts of a pH electrode mounting port, 7 parts of a reference electrode salt bridge mounting port, 8 parts of a titration base solution injection port, 9 parts of a titration solution injection port, 10 parts of an Ag/AgCl reference electrode cap, 11 parts of a reference electrode lead-out wire, 12 parts of an Ag/AgCl electrode, 13 parts of a reaction cavity cover, 14 parts of a reference electrode filling port cover, 15 parts of a pH electrode fixing nut, 16 parts of a pH electrode lead-out wire, 17 parts of a pH electrode, 18 parts of a pH electrode fixing ring, 19 parts of a sealing ring, 20 parts of a porous ceramic salt bridge, 21 parts of a salt bridge fixing column, 22 parts of a.
Detailed Description
The present invention will be further described with reference to the following examples, which include, but are not limited to, the following examples.
The utility model comprises the following steps:
as shown in fig. 1, fig. 2 and fig. 3, the utility model discloses a titration vessel, titration vessel is last to be equipped with titration reaction chamber 1, titration vessel's side be provided with the tilting trompil and with titration reaction chamber 1 intercommunication, be provided with pH electrode 17 in the tilting trompil titration reaction chamber 1 is equipped with magnetic stirrers and salt bridge, the salt bridge with pH electrode 17 all is located magnetic stirrers's top.
The titration cell is made of highly transparent organic glass, a reaction chamber cover 13 is arranged on the titration reaction chamber 1, four liquid inlet and outlet ports are arranged on the front and rear surfaces of the bottommost part of the reaction cell and are respectively used for injecting cleaning liquid, discharging waste liquid, injecting titration base liquid and injecting titration liquid, and an inclined opening is formed in the side surface of the reaction cell and is communicated with the reaction chamber for installing a pH electrode 17. Opposite the pH electrode is a reference electrode integrated with the titration cell. An Ag/AgCl reference electrode mounting port 2, a reference electrode electrolyte adding port 3, a reaction cavity cleaning liquid inlet 4, a reaction cavity waste liquid outlet 5 and a pH electrode mounting port 6 are arranged on the titration cell.
The titration container is provided with a cleaning liquid injection interface, a waste liquid discharge interface, a titration base liquid injection interface 8 and a titration liquid injection interface 9.
The titration reaction cavity is internally provided with a pH reference electrode, the pH reference electrode 17 is of a U-shaped tube structure, an Ag/AgCl electrode is placed on one side, an electrolyte solution containing inlet is arranged on the other side, the pH reference electrode is of a U-shaped tube structure, the two sides of the pH reference electrode are communicated through a salt bridge fixing column, the electrolyte adopts a saturated KCl solution, the saturated state of the electrolyte can be ensured by observing KCl separated out by crystallization, the stability of a reference potential is ensured, and the bottom of the pH reference electrode is connected with the reaction cavity through a salt bridge 20.
A pH electrode leading-out wire 16 is arranged on the pH electrode 17, a pH electrode fixing ring 18 is arranged on the pH electrode 17, and a pH electrode fixing nut 15 is arranged at the tail end of the pH electrode 17 and connected with the titration container.
The salt bridge is a porous ceramic salt bridge 20 which is connected with the titration reaction cavity 1 and a reference electrode U-shaped tube.
The bottom of the titration reaction cavity 1 is provided with a round concave hole for positioning and installing the magnetic stirrer.
The pH electrode 17 is a glass electrode, the pH electrode 17 adopts a 721 glass electrode, and the pH electrode is manufactured by shortening a glass tube and additionally installing a fixing ring, so that the volume limit of the reaction tank is reduced.
The salt bridge is arranged on the salt bridge fixing column 21 and is connected with the titration reaction cavity 1 through a salt bridge mounting nut 22.
And the pH electrode 17 and the salt bridge are provided with sealing rings to prevent the titrating solution and the reference electrode from leaking.
The above-mentioned embodiments are only preferred embodiments of the present invention, and should not be used to limit the protection scope of the present invention, but all the insubstantial changes or modifications made in the spirit and the idea of the main design of the present invention, the technical problems solved by the embodiments still remain with the present invention, and all should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a titration cell for pH potentiometric titration, includes titrates the container, titrate and be equipped with on the container and titrate the reaction chamber, its characterized in that, titrate the side of container be provided with the tilting trompil and with titrate the reaction chamber intercommunication, be provided with the pH electrode in the tilting trompil titrate the reaction intracavity and be equipped with magnetic stirrers and salt bridge, the salt bridge with the pH electrode all is located magnetic stirrers's top.
2. The titration cell according to claim 1, wherein the titration container is provided with a cleaning solution inlet, a waste solution outlet, a titration base solution inlet and a titration solution inlet.
3. The titration cell according to claim 1, wherein a pH reference electrode is disposed in the titration reaction chamber, the pH reference electrode is a U-shaped tube structure, an Ag/AgCl electrode is disposed on one side, and an electrolyte solution inlet is disposed on the other side.
4. The titration cell according to claim 1 or 3, wherein a pH electrode lead wire is provided on the pH electrode, a pH electrode fixing ring is provided on the pH electrode, and a pH electrode fixing nut is provided at the tail end of the pH electrode to connect with the titration container.
5. The titration cell according to claim 1, wherein the salt bridge is made of porous ceramic and is connected to the titration reaction chamber.
6. The titration cell according to claim 1, wherein a circular recess is formed in the bottom of the titration reaction chamber for positioning and mounting the magnetic stirrer.
7. The titration cell according to claim 1, wherein the pH electrode is a glass electrode.
8. The titration cell according to claim 1, wherein the salt bridge is disposed on a salt bridge fixing column and connected to the titration reaction chamber via a salt bridge mounting nut.
9. The titration cell according to claim 1, wherein the pH electrode and the salt bridge are provided with sealing rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020699686.9U CN211978799U (en) | 2020-04-30 | 2020-04-30 | Titration cell for pH potentiometric titration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020699686.9U CN211978799U (en) | 2020-04-30 | 2020-04-30 | Titration cell for pH potentiometric titration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211978799U true CN211978799U (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020699686.9U Active CN211978799U (en) | 2020-04-30 | 2020-04-30 | Titration cell for pH potentiometric titration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211978799U (en) |
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2020
- 2020-04-30 CN CN202020699686.9U patent/CN211978799U/en active Active
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