CN112730525B - Low-concentration trace water sample pH conductivity detector - Google Patents
Low-concentration trace water sample pH conductivity detector Download PDFInfo
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- CN112730525B CN112730525B CN202011566579.XA CN202011566579A CN112730525B CN 112730525 B CN112730525 B CN 112730525B CN 202011566579 A CN202011566579 A CN 202011566579A CN 112730525 B CN112730525 B CN 112730525B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 238000001514 detection method Methods 0.000 claims abstract description 173
- 238000004891 communication Methods 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 22
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 5
- 238000001139 pH measurement Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000006123 lithium glass Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
Abstract
The invention discloses a low-concentration trace water sample pH conductivity detector, which comprises a peristaltic pump, a conductivity detection seat for installing a conductivity electrode, a pH detection seat for installing a pH electrode and a three-way valve communicated with the atmosphere, wherein the conductivity detection seat and the pH detection seat are respectively provided with a bottom communication hole and a side communication hole; the bottom communicating hole of the conductivity detection seat is communicated with the peristaltic pump, a detection seat communicating pipeline is arranged between the side communicating hole of the conductivity detection seat and the bottom communicating hole of the pH detection seat, and the side communicating hole of the pH detection seat is connected with the three-way valve; the conductivity detection seat and the pH detection seat are both of sealing structures. The structure that the conductivity detection seat and the pH detection seat enter from the lower side can utilize gas to block the water sample to be detected in the two detection seats during detection, and smoothly discharge all the water samples during reversed liquid discharge of the peristaltic pump, so that sodium ions generated by pH electrode measurement are prevented from entering the conductivity detection seat, and accurate measurement of pH conductivity of the low-concentration trace water sample is realized.
Description
Technical Field
The invention relates to the technical field of water sample detection, in particular to a low-concentration trace water sample pH conductivity detector.
Background
The pH and conductivity of the water sample are detected by a flow cell installation method, namely, the peristaltic pump is utilized to introduce the water sample into a detection container, and meanwhile, a pH electrode and a conductivity electrode are inserted for measurement.
Because the pH electrode is sodium glass or lithium glass, the pH electrode releases sodium ions after being placed in water, thereby interfering with the conductivity measurement of the water sample. In order to eliminate the interference of pH measurement on conductivity measurement, a pH electrode and a conductivity electrode are generally arranged separately, and the measurement interference is reduced by increasing the distance between the two electrodes, so that the measurement method has extremely high requirements on the water quantity of a water sample, and can not be used at all when the concentration of the water sample to be measured is low or the volume of the water sample to be measured is small.
In summary, how to realize accurate pH conductivity measurement of low concentration trace water samples is a problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the invention aims to provide the low-concentration trace water sample pH conductivity detector which can isolate a conductivity electrode and a pH electrode by utilizing gas, avoid interference of the pH electrode on low-concentration trace water sample conductivity measurement and realize accurate measurement of the pH conductivity of the low-concentration trace water sample.
In order to achieve the above object, the present invention provides the following technical solutions:
the low-concentration trace water sample pH conductivity detector comprises a peristaltic pump, a conductivity detection seat for installing a conductivity electrode, a pH detection seat for installing a pH electrode and a three-way valve communicated with the atmospheric environment, wherein the conductivity detection seat and the pH detection seat are respectively provided with a bottom communication hole and a side communication hole;
the bottom communication hole of the conductivity detection seat is communicated with the peristaltic pump, a detection seat communication pipeline is arranged between the side communication hole of the conductivity detection seat and the bottom communication hole of the pH detection seat, and the side communication hole of the pH detection seat is connected with the three-way valve;
the conductivity detection seat and the pH detection seat are of sealing structures.
Preferably, the conductivity detection seat and the pH detection seat comprise detection seats and sealing covers for sealing the detection seats, and the sealing covers are arranged on the upper end faces of the detection seats.
Preferably, the detection seat is cylindrical, and the inner diameter of the detection seat is larger than the outer diameter of the conductance electrode or the outer diameter of the pH electrode.
Preferably, the three-way valve comprises a liquid inlet, a liquid outlet and a pressure balance port, wherein the pressure balance port is used for being communicated with the atmospheric environment, and the liquid inlet is communicated with the side communication hole of the pH detection seat.
Preferably, one of the sealing cover and the detecting seat is provided with a positioning groove, and the other is provided with a positioning block clamped with the positioning groove.
Preferably, the axis of the bottom communication hole is collinear with the axis of the detection seat.
Preferably, the side communication hole is disposed at one end of the detection seat, which is relatively close to the sealing cover.
When the low-concentration trace water sample pH conductivity detector provided by the invention is used for measuring, a water sample to be measured is injected into a sample inlet of a peristaltic pump, the water sample to be measured sequentially enters a conductivity detection seat and a pH detection seat through the peristaltic pump, and the water sample to be measured exceeding a side communication hole of the pH detection seat enters a three-way valve and is discharged from a waste liquid outlet; after the liquid injection is completed, introducing gas into the sample inlet, wherein the density of the gas is smaller than that of the water sample to be detected, the gas is accumulated above the water sample to be detected and enters a detection seat communication pipeline through a side communication hole of the conductivity detection seat, and an air isolation column is formed in the detection seat communication pipeline to isolate the water sample to be detected in the conductivity detection seat and the pH detection seat; after the detection is finished, the peristaltic pump is controlled to rotate reversely, air enters the pH detection seat through the three-way valve, and the water sample to be detected in the pH detection seat is pressed into the detection seat communicating pipeline, so that the water sample to be detected after the detection is discharged from the sample inlet of the peristaltic pump.
Therefore, the structure of the lower inlet side and the lower outlet side of the conductivity detection seat and the pH detection seat can utilize the gas to block the water sample to be detected in the conductivity detection seat and the water sample to be detected in the pH detection seat during detection, and smoothly discharge all the water samples during reversed liquid discharge of the peristaltic pump, so that sodium ions generated by pH electrode measurement are prevented from entering the conductivity detection seat, and accurate pH conductivity measurement of low-concentration trace water samples is realized.
Meanwhile, the structure of the lower inlet side outlet ensures that the peristaltic pump is used for excessively pumping liquid or the volume of the water sample to be detected is too small, air enters the pH detection seat, the non-drying arrangement of the pH electrode is ensured, and the fault damage caused by the drying arrangement of the pH electrode is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low concentration trace water sample pH conductivity detector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the low concentration trace water sample pH conductivity detector of FIG. 1 assembled with a multichannel option valve.
In fig. 1-2:
the peristaltic pump is 1, the detection seat is 2, the bottom communication hole is 21, the side communication hole is 22, the sealing cover is 3, the detection seat communication pipeline is 4, the three-way valve is 5, the pressure balance port is 51, the waste liquid port is 52, the liquid inlet is 53, the electric conduction electrode is 6, the pH electrode is 7, the multi-channel option valve is 8, the cleaning channel is 81, the electric conduction standard liquid channel is 82, the pH standard liquid channel is 83, the online sample channel is 84, the offline sample channel is 85, and the air channel is 86.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a low-concentration trace water sample pH conductivity detector, which can isolate a conductivity electrode and a pH electrode by utilizing gas, avoid interference of the pH electrode on low-concentration trace water sample conductivity measurement and realize accurate measurement of the pH conductivity of the low-concentration trace water sample.
Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an embodiment of a low concentration trace water sample pH conductivity detector according to the present invention; FIG. 2 is a schematic diagram of the structure of the low concentration trace water sample pH conductivity detector of FIG. 1 assembled with a multichannel option valve.
The low-concentration trace water sample pH conductivity detector provided by the embodiment comprises a peristaltic pump 1, a conductivity detection seat for installing a conductivity electrode 6, a pH detection seat for installing a pH electrode 7 and a three-way valve 5 communicated with the atmospheric environment, wherein the conductivity detection seat and the pH detection seat are respectively provided with a bottom communication hole 21 and a side communication hole 22; the bottom communication hole 21 of the conductivity detection seat is communicated with the peristaltic pump 1, a detection seat communication pipeline 4 is arranged between the side communication hole 22 of the conductivity detection seat and the bottom communication hole 21 of the pH detection seat, and the side communication hole 22 of the pH detection seat is connected with the three-way valve 5; the conductivity detection seat and the pH detection seat are both of sealing structures.
Considering that sodium ions generated by the pH electrode detection method can influence the conductivity detection result, but the conductivity electrode detection method cannot influence the pH detection result, the conductivity detection seat is arranged on the upstream of the pH detection seat, namely when a water sample to be detected is added, the water sample to be detected flows into the pH detection seat from the conductivity detection seat.
Referring to fig. 1, the conductivity detecting seat and the pH detecting seat are used for installing the conductivity electrode 6 and the pH electrode 7, respectively, and are provided with a bottom communicating hole 21 and a side communicating hole 22.
In order to guarantee the formation of gas barrier column, conductance detection seat and pH detection seat are seal structure, and preferably, for the installation that makes things convenient for conductance detection seat and pH detection seat, conductance detection seat and pH detection seat all include detection seat 2 and be used for sealed lid 3 that detects seat 2, sealed lid 3 sets up in the up end that detects seat 2.
The conductivity detection seat and the pH detection seat may be configured as hollow cylinders, hollow cuboids or any other geometric shapes, and considering that the conductivity electrode 6 and the pH electrode 7 are cylindrical, it is preferable that the detection seat 2 be configured as a cylinder, and the inner diameter of the detection seat 2 be larger than the outer diameter of the conductivity electrode 6 or the outer diameter of the pH electrode 7.
Because the height of the water sample to be detected is required to be higher than the measurement height of the water sample to be detected during electrode measurement, the volume of the water sample to be detected required during detection can be increased due to the fact that the inner diameter of the detection seat 2 is too large, and detection of a trace amount of water sample is not facilitated. For the above reasons, it is preferable that the size of the detection seat 2 is the same as the size of the original electrode cap of the conductivity electrode 6 or the pH electrode 7.
Preferably, the side communication hole 22 is provided at one end of the detection seat 2 relatively close to the sealing cover 3. The height of the measuring seat 2 is advantageously lowered when the required measuring height is fixed during electrode measurement.
The height of the side communication hole 22 from the bottom surface of the detection seat 2 is determined according to the measurement height required by electrode measurement, so as to ensure that the height of the water sample to be detected in the detection seat 2 is higher than the measurement height.
Considering that the inner wall surface of the conductivity detection seat and the inner wall surface of the pH detection seat are directly contacted with the water sample to be detected, in order to avoid interference with experimental structures, the conductivity detection seat and the pH detection seat are made of materials with stable chemical properties so as to avoid chemical reaction with the water sample to be detected.
The detection seat communication pipeline 4 is connected with the conductivity detection seat and the pH detection seat, and the inner wall surface of the detection seat communication pipeline 4 is also contacted with the water sample to be detected, so that the detection seat communication pipeline 4 is also made of a material with stable chemical properties, thereby avoiding reaction with the water sample to be detected and pollution to the water sample.
The three-way valve 5 is mainly used for discharging the excessive water sample during excessive liquid adding and discharging the liquid after the experiment is completed, please refer to the figure, preferably, the three-way valve 5 comprises a liquid inlet 53, a liquid outlet 52 and a pressure balancing port 51, the pressure balancing port 51 is used for communicating with the atmosphere, and the liquid inlet 53 is communicated with the side communication hole 22 of the pH detection seat.
During measurement, a water sample to be measured is injected into a sample inlet of the peristaltic pump 1, sequentially enters the conductivity detection seat and the pH detection seat through the peristaltic pump 1, and enters the three-way valve 5 and is discharged from the waste liquid port 52 after exceeding a side communication hole 22 of the pH detection seat; after the liquid injection is completed, introducing gas into the sample inlet, wherein the density of the gas is smaller than that of the water sample to be detected, the gas is accumulated above the water sample to be detected and enters the detection seat communication pipeline 4 through the side communication hole 22 of the conductivity detection seat, and an air isolation column is formed in the detection seat communication pipeline 4 to isolate the water sample to be detected in the conductivity detection seat and the pH detection seat; after the detection is finished, the peristaltic pump 1 is controlled to rotate reversely, air enters the pH detection seat through the three-way valve 5, and the water sample to be detected in the pH detection seat is pressed into the detection seat communication pipeline 4, so that the water sample to be detected after the detection is discharged from the sample inlet of the peristaltic pump 1.
In this embodiment, the structure of going into side out under conductivity detection seat and the pH detection seat can utilize gas barrier conductivity to detect the water sample that awaits measuring in the seat and the water sample that awaits measuring in the pH detection seat when detecting to discharge all water samples smoothly when peristaltic pump 1 reversal flowing back, avoided the sodium ion that pH electrode measurement produced to get into in the conductivity detection seat, realized the accurate measurement of pH electric conductance to low concentration trace water sample.
Meanwhile, the structure of the lower inlet side outlet ensures that the peristaltic pump 1 is excessively used for pumping liquid or the volume of the water sample to be detected is too small, air enters the pH detection seat, the non-drying arrangement of the pH electrode is ensured, and the dry arrangement fault damage of the pH electrode is reduced.
Preferably, the axis of the bottom communication hole 21 is collinear with the axis of the detection seat 2.
On the basis of the above embodiment, one of the sealing cover 3 and the detecting seat 2 is provided with a positioning groove, and the other is provided with a positioning block clamped with the positioning groove.
The positioning groove can be arranged on the upper end surface of the detection seat 2 and can be arranged on the inner wall surface of the upper end of the detection seat 2.
The positioning groove can be an annular groove arranged around the circumference of the detection seat 2, or can be one or more sections of arc grooves.
The cross section of the positioning groove can be set to be any geometric shape such as rectangle, triangle, trapezoid and the like.
In this embodiment, sealed lid 3 is connected with detection seat 2 joint, compares sealed lid 3 and directly places on the up end of detecting seat 2, connects stably, sealed lid 3 is difficult for separating with detection seat 2.
On the basis of the above embodiment, the inlet of the peristaltic pump 1 is connected to the multi-channel option valve 8, and the multi-channel option valve 8 includes a detection channel for adding and discharging the water sample to be measured and a washing channel 81 for adding and discharging pure water.
During detection, a detection channel of the multichannel option valve 8 is opened, and a water sample to be detected enters the peristaltic pump 1; after detection is completed and the water sample to be detected is completely discharged, a cleaning channel 81 of the multi-channel option valve 8 is opened, pure water enters the conductivity detection seat and the pH detection seat through the peristaltic pump 1, after soaking for a certain time, the peristaltic pump 1 is controlled to reversely rotate, and waste liquid is discharged; repeating the above process for 3 times to finish the cleaning of the conductivity detection seat and the pH detection seat; and the pure water is used for soaking the conductive electrode 6 and the pH electrode 7, so that the residual water sample on the electrode surface is removed, and the interference to the next measurement is avoided.
In the embodiment, the peristaltic pump 1 is matched with the multichannel option valve 8, so that automatic measurement and cleaning of a low-concentration trace water sample are realized, the operation is convenient, and the detection efficiency is improved.
In one embodiment, referring to fig. 2, the multi-channel selector valve 8 may include a purge channel 81, an electrically conductive label channel 82, a pH label channel 83, an online sample channel 84, an offline sample channel 85, and an air channel 86.
Wherein, the cleaning channel 81 is used for adding pure water and cleaning the conductive electrode 6 and the pH electrode 7 after detection is completed; the electric conductivity standard liquid channel 82 and the pH standard liquid channel 83 are respectively used for adding electric conductivity standard liquid and pH standard liquid so as to calibrate the electric conductivity electrode 6 and the pH electrode 7 of the low-concentration trace water sample pH electric conductivity detector; the online sample channel 84 and the offline sample channel 85 are used for adding a water sample to be detected and are used for online detection and offline detection respectively; the air channel 86 is used for inputting air into the pH detection seat when the volume of the water sample to be detected is too small, so as to prevent the pH electrode 7 from being dry and causing the malfunction of the pH electrode.
Therefore, the low-concentration trace water sample pH conductivity detector provided by the embodiment realizes automatic calibration, automatic detection and automatic cleaning, can be suitable for two different detection modes of online detection and offline detection, and has wide application range.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The low-concentration trace water sample pH conductivity detector provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (7)
1. The pH conductivity detector for the low-concentration trace water sample is characterized by comprising a peristaltic pump (1), a conductivity detection seat for installing a conductivity electrode (6), a pH detection seat for installing a pH electrode (7) and a three-way valve (5) communicated with the atmospheric environment, wherein the conductivity detection seat and the pH detection seat are respectively provided with a bottom communication hole (21) and a side communication hole (22);
the bottom communication hole (21) of the conductivity detection seat is communicated with the peristaltic pump (1), a detection seat communication pipeline (4) is arranged between the side communication hole (22) of the conductivity detection seat and the bottom communication hole (21) of the pH detection seat, and the side communication hole (22) of the pH detection seat is connected with the three-way valve (5);
the conductivity detection seat and the pH detection seat are both of sealing structures;
during liquid injection, the peristaltic pump (1) injects a water sample to be detected into the conductivity detection seat and the pH detection seat, and after liquid injection is completed, the peristaltic pump (1) introduces gas into the conductivity detection seat and the pH detection seat so as to form an air isolation column in the detection seat communication pipeline (4).
2. The low-concentration trace water sample pH conductivity detector according to claim 1, wherein the conductivity detection seat and the pH detection seat comprise a detection seat (2) and a sealing cover (3) for sealing the detection seat (2), and the sealing cover (3) is arranged on the upper end face of the detection seat (2).
3. The low concentration trace water sample pH conductivity detector according to claim 2, wherein the detection seat (2) is cylindrical and the inner diameter of the detection seat (2) is larger than the outer diameter of the conductivity electrode (6) or the outer diameter of the pH electrode (7).
4. The low concentration trace water sample pH conductivity detector according to claim 2, wherein said three-way valve (5) comprises a liquid inlet (53), a liquid outlet (52) and a pressure balancing port (51), said pressure balancing port (51) being for communication with the atmosphere, said liquid inlet (53) being in communication with said side communication hole (22) of said pH detecting seat.
5. The low concentration trace water sample pH conductivity detector according to any one of claims 2-4, wherein one of said sealing cover (3) and said detecting seat (2) is provided with a positioning groove, and the other is provided with a positioning block which is clamped with said positioning groove.
6. The low concentration micro water sample pH conductivity detector according to claim 5, wherein the axis of the bottom communication hole (21) is collinear with the axis of the detection seat (2).
7. The low concentration trace water sample pH conductivity detector according to claim 5, wherein said side communicating hole (22) is provided at an end of said detecting seat (2) relatively close to said sealing cover (3).
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| CN202011566579.XA CN112730525B (en) | 2020-12-25 | 2020-12-25 | Low-concentration trace water sample pH conductivity detector |
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| CN202011566579.XA CN112730525B (en) | 2020-12-25 | 2020-12-25 | Low-concentration trace water sample pH conductivity detector |
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| CN114487028A (en) * | 2022-01-26 | 2022-05-13 | 西安热工研究院有限公司 | Method and device for improving pH on-line measurement accuracy of low-conductivity water sample |
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