CN115774046A - Electric ion migration type trace chloride ion measuring system and method - Google Patents
Electric ion migration type trace chloride ion measuring system and method Download PDFInfo
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- CN115774046A CN115774046A CN202211584268.5A CN202211584268A CN115774046A CN 115774046 A CN115774046 A CN 115774046A CN 202211584268 A CN202211584268 A CN 202211584268A CN 115774046 A CN115774046 A CN 115774046A
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 119
- 238000013508 migration Methods 0.000 title claims abstract description 31
- 230000005012 migration Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 150000002500 ions Chemical class 0.000 title claims abstract description 28
- 239000000243 solution Substances 0.000 claims abstract description 70
- 239000011550 stock solution Substances 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003011 anion exchange membrane Substances 0.000 claims abstract description 30
- 239000003957 anion exchange resin Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 7
- 230000002572 peristaltic effect Effects 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- 230000037427 ion transport Effects 0.000 claims 1
- -1 polytetrafluoroethylene Polymers 0.000 description 6
- 150000001450 anions Chemical class 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000004255 ion exchange chromatography Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000004448 titration Methods 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical group [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 150000001768 cations Chemical class 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009791 electrochemical migration reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
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- 229910001385 heavy metal Inorganic materials 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses an electric ion migration type trace chloride ion measuring system and method.A solution chamber to be measured, an anode support plate, an anode anion exchange membrane, an anion exchange resin chamber, a cathode anion exchange membrane, a cathode electrode plate and an enrichment stock solution chamber are sequentially arranged in a shell from top to bottom, wherein the anion exchange resin chamber is filled with anion exchange resin; the chloride ion selective electrode is inserted into the solution chamber to be detected and is connected with a chloride ion display instrument; the sample water inlet pipeline is communicated with the inlet of the solution chamber to be detected and the inlet of the enrichment stock solution chamber through a sample injection pump; the outlet of the solution chamber to be measured and the outlet of the enrichment stock solution chamber are communicated with a sample water outlet pipeline through a discharge pump; the system and the method can reduce the lower limit of the traditional electrode method for detecting chloride ions to 0.5 mu g/L.
Description
Technical Field
The invention belongs to the technical field of analysis and detection, and relates to an electric ion migration type trace chloride ion measurement system and method.
Background
With the rapid development of the power industry, high-capacity high-parameter supercritical and ultra-supercritical units continuously appear, and the power plant puts higher requirements on the quality of water vapor. Chloride ions are the most harmful active anions in the moisture system, and trace levels of chloride ions in the moisture system are sufficient to destroy the integrity of the metal surface oxide protective film. Therefore, the online measurement of the trace chloride ions is very critical to timely find the change of the water vapor quality, adjust the operation condition and ensure the safe operation of the thermodynamic system. The GB/T12145-2016 (quality of steam for thermal power generation units and steam power equipment) standard requires that the mass concentration of chloride ions in outlet water of a unit fine treatment system with the steam drum pressure of more than 15.8MPa is less than 1 mug/L, along with the popularization and implementation of the GB/T12145-2016, the chloride ions become an important control index for steam supervision of a power plant, and online measurement of trace chloride ions in a steam system has important significance for monitoring the mass concentration of chloride ions in real time in the power plant.
At present, the measuring methods of chloride ions mainly include a titration method, a spectrophotometry method, an ion chromatography method, an electrode method, and the like. The measuring range of the titration method for detecting the chloride ions is 5-150 mg/L, and the titration method is not suitable for analyzing and detecting trace-level chloride ions. The spectrophotometry needs to be carried out after the reagent is added with medicine for color development, and the measuring method is not comprehensively popularized all the time because the reagent contains mercury, a heavy metal highly toxic substance. At present, the method for detecting trace chloride ions accurately and conveniently is recognized at home and abroad only by ion chromatography. However, the ion chromatography is expensive, the maintenance cost is high, the maintenance workload is large, and online measurement is not easy to realize.
The electrode method is that the chloride ion in water is directly measured by the chloride ion selective electrode, and the electrode only has response value to the chloride ion in the water, but the detection lower limit of the current chloride ion selective electrode is only 5 mug/L due to the limit of the manufacturing process. The power industry specification requires that the control index of some chloride ion measuring points is within 1 mug/L, so the lower detection limit of the measuring method meeting the measuring requirement should reach 0.5 mug/L, and the traditional electrode method for measuring trace chloride ions cannot meet the measuring requirement at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an ion migration type trace chloride ion measurement system and method, which can enable the lower limit of the traditional electrode method for detecting chloride ions to reach 0.5 mu g/L so as to meet the requirement of trace level chloride ion detection in the power industry at present.
In order to achieve the aim, the ion migration type trace chloride ion measuring system comprises a shell, a chloride ion selective electrode, a chloride ion display instrument, a sample water inlet pipeline, a sample feeding pump, a discharge pump, a sample water outlet pipeline and a constant current power supply;
a to-be-detected solution cavity, a positive support plate, a positive anion exchange membrane, an anion exchange resin cavity, a negative anion exchange membrane, a negative electrode plate and an enrichment stock solution cavity are sequentially arranged in the shell from top to bottom, wherein anion exchange resin is filled in the anion exchange resin cavity;
the chloride ion selective electrode is inserted into the solution chamber to be detected and is connected with a chloride ion display instrument; the sample water inlet pipeline is communicated with the inlet of the solution chamber to be detected and the inlet of the enrichment stock solution chamber through a sample injection pump; the outlet of the to-be-detected solution chamber and the outlet of the enrichment stock solution chamber are communicated with a sample water outlet pipeline through a discharge pump; the anode of the constant current power supply is connected with the anode electrode plate, and the cathode of the constant current power supply is connected with the cathode electrode plate.
The sample inlet pipeline is communicated with a first opening of the sample inlet three-way valve through a sample inlet pump, a second opening of the sample inlet three-way valve is communicated with an inlet of the to-be-detected solution chamber, and a third opening of the sample inlet three-way valve is communicated with an inlet of the enrichment stock solution chamber;
the device also comprises a discharge three-way valve, wherein the outlet of the to-be-detected solution chamber is communicated with the first opening of the discharge three-way valve, the outlet of the enrichment stock solution chamber is communicated with the second opening of the discharge three-way valve, and the third opening of the discharge three-way valve is communicated with a sample water outlet pipeline through a discharge pump.
The device comprises a shell, and is characterized in that a to-be-detected solution cavity, a positive support plate, a positive electrode plate, a positive anion exchange membrane, an anion exchange resin cavity, a negative anion exchange membrane, a negative electrode plate, a negative support plate and an enrichment stock solution cavity are sequentially arranged in the shell from top to bottom, wherein anion exchange resin is filled in the anion exchange resin cavity.
The overflow port on the side surface of the top of the enrichment stock solution chamber is communicated with the overflow water outlet pipeline through the overflow valve.
The shell is of an inverted T-shaped structure.
The outlet of the enrichment stock solution chamber is arranged on the side surface of the bottom of the enrichment stock solution chamber, and the outlet of the solution chamber to be detected is arranged on the side surface of the bottom of the solution chamber to be detected.
The positive electrode plate, the negative electrode plate, the positive support plate and the negative support plate are all provided with water distribution round holes.
The sample injection pump uses a peristaltic pump;
the exhaust pump uses a vacuum pump.
The invention relates to an ion migration type trace chloride ion measuring method, which comprises the following steps:
a sample water sample enters a solution chamber to be detected and an enrichment stock solution chamber through a sample injection pump, and an overflow valve is opened at the same time;
starting a constant current power supply, providing constant current for the positive electrode plate and the negative electrode plate through the constant current power supply, and transferring chloride ions in the enriched stock solution to a solution to be tested under the action of an electric field to finish the operation of enriching the chloride ions;
when all the chloride ions in the enriched stock solution are transferred into the solution to be detected, measuring the chloride ion content in the solution to be detected through the chloride ion selective electrode, transmitting a detection signal to a chloride ion display instrument, calculating the proportion of the chloride ion content in the solution to be detected and the chloride ion content in the original sample water according to the volume proportion of the solution to be detected and the enriched stock solution, and dividing the detection value of the chloride ion selective electrode obtained by the chloride ion display instrument by the proportion to obtain the chloride ion content of the sample water.
The invention has the following beneficial effects:
the invention relates to an ion migration type trace chloride ion measuring system and method, which are characterized in that when in specific operation, chloride ions are enriched into a sample to be detected by utilizing the principle of ion migration, the concentration of the chloride ions in the sample to be detected is improved in multiples, the detection sensitivity of the traditional chloride ion electrode method is effectively improved, the lower limit of the detection of the chloride ions by the traditional electrode method reaches 0.5 mu g/L, so that the electrode method can be used for water quality detection points which cannot meet the detection requirements originally, the ion migration type trace chloride ion measuring system and method can be realized by only consuming a small amount of electric energy without consuming any reagent, the measured waste liquid can be directly discharged, the waste liquid discharge requirements of the power industry are met, the ion migration type trace chloride ion measuring system and method are green, environment-friendly, simple to operate and easy to maintain, and the detection cost of the chloride ions is further reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a sample pump, 2 is a sample three-way valve, 3 is a cavity of solution to be measured, 4 is a cavity of enrichment stock solution, 5 is a chloride ion selective electrode, 6 is a chloride ion display instrument, 7 is a cavity of anion exchange resin, 8 is a positive electrode support plate, 9 is a positive electrode plate, 10 is a positive electrode anion exchange membrane, 11 is a negative electrode anion exchange membrane, 12 is a negative electrode plate, 13 is a negative electrode support plate, 14 is a constant current power supply, 15 is an overflow valve, 16 is a discharge three-way valve, and 17 is a discharge pump.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and do not limit the scope of the disclosure of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and some details may be omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the ion migration type trace chlorine ion measuring system of the present invention comprises a housing, a chlorine ion selective electrode 5, a chlorine ion display instrument 6, a sample inlet pipe, a sample inlet pump 1, a discharge pump 17, a sample outlet pipe and a constant current power supply 14;
the solution chamber 3 to be measured, the anode supporting plate 8, the anode electrode plate 9, the anode anion exchange membrane 10, the anion exchange resin chamber 7, the cathode anion exchange membrane 11, the cathode electrode plate 12, the cathode supporting plate 13 and the enrichment stock solution chamber 4 are sequentially arranged in the shell from top to bottom, wherein anion exchange resin is filled in the anion exchange resin chamber 7.
The chloride ion selective electrode 5 is inserted into the solution chamber 3 to be tested, and the chloride ion selective electrode 5 is connected with the chloride ion display instrument 6.
The sample inlet pipe is communicated with a first opening of the sample inlet three-way valve 2 through the sample inlet pump 1, a second opening of the sample inlet three-way valve 2 is communicated with an inlet of the solution chamber 3 to be measured, and a third opening of the sample inlet three-way valve 2 is communicated with an inlet of the enrichment stock solution chamber 4.
The outlet of the to-be-detected solution chamber 3 is communicated with a first opening of a discharge three-way valve 16, the outlet of the enrichment stock solution chamber 4 is communicated with a second opening of the discharge three-way valve 16, and a third opening of the discharge three-way valve 16 is communicated with a sample water outlet pipeline through a discharge pump 17.
The positive pole of the constant current power supply 14 is connected with the positive electrode plate 9, and the negative pole of the constant current power supply 14 is connected with the negative electrode plate 12; an overflow port on the side surface of the top of the enrichment stock solution chamber 4 is communicated with an overflow water outlet pipeline through an overflow valve 15; the shell is of an inverted T-shaped structure.
The positive support plate 8, the positive electrode plate 9 and the positive anion exchange membrane 10 jointly form an ion migration positive electrode; the negative electrode support plate 13, the negative electrode plate 12 and the negative electrode anion exchange membrane 11 jointly form an ion migration negative electrode. The anion exchange resin is arranged between the positive ion migration pole and the negative ion migration pole as the anion exchange resin cavity 7. The constant current power supply 14 is connected to the positive electrode plate 9 and the negative electrode plate 12, and supplies a constant current as a power source for the ion migration process.
Specifically, the sample injection pump 1 uses a peristaltic pump, the flow rate is required to be 100mL/min, and the flow rate error is within 1%.
The exhaust pump 17 uses a vacuum pump and the flow rate is 250mL/min.
The sample introduction three-way valve 2, the overflow valve 15 and the discharge three-way valve 16 can be electrically controlled, the power supply voltage is direct current 24V, the three-way valve can be switched between two flow paths after being electrified, and the overflow valve 15 can control the flow paths to be opened and closed. The outlet of the enrichment stock solution chamber 4 is arranged on the side surface of the bottom of the enrichment stock solution chamber 4, and the outlet of the solution chamber 3 to be tested is arranged on the side surface of the bottom of the solution chamber 3 to be tested, so that the solution chamber 3 to be tested and the enrichment stock solution chamber 4 can completely discharge residual solution.
The solution chamber 3 to be detected and the enrichment stock solution chamber 4 are processed by organic glass materials, the volume of the solution chamber 3 to be detected is 100mL, and when the inflow volume of the solution to be detected reaches 50mL, the solution to be detected occupies 2/3 of the height of the solution chamber 3 to be detected; the volume of the concentrate liquor chamber 4 is 450mL.
The positive supporting plate 8 and the negative supporting plate 13 are made of polytetrafluoroethylene materials, the thickness of the positive supporting plate 8 and the thickness of the negative supporting plate 13 are 5mm, and water distribution circular holes with the diameter of 1mm are uniformly distributed on the positive supporting plate 8 and the negative supporting plate 13 and used for uniformly distributing solution on the positive electrode plate 9 and the negative electrode plate 12, so that the solution can be fully contacted with the positive electrode plate 9 and the negative electrode plate 12.
The positive electrode plate 9 and the negative electrode plate 12 are made of platinum materials, the thickness of the positive electrode plate 9 and the negative electrode plate 12 is 0.2mm, and water distribution circular holes with the diameter of 1mm are uniformly distributed on the positive electrode plate 9 and the negative electrode plate 12, so that the solution can be fully contacted with the anion exchange resin 7 membrane.
The positive electrode anion exchange membrane 10 and the negative electrode anion exchange membrane 11 are anion selective permeable membranes which do not allow aqueous solution to permeate but only allow anions to permeate, and the types of the membranes are as follows: EDI-3364.
The types of anion exchange resin are: 201X 7, the resin state is oxyhydrogen type, the resin is kept wet and is filled in the anion exchange resin cavity 7, and the filling volume is 50mL.
The constant current power supply 14 may provide a 24V dc voltage with a 200mA constant current.
The types of the chloride ion selective electrode 5 are: CL-100025, detection lower limit 5. Mu.g/L, measurement range (5-10000). Mu.g/L.
The invention relates to an ion migration type trace chloride ion measuring method, which comprises the following steps:
the sample water sample flows to a sample introduction three-way valve 2 through a sample introduction pump 1, then enters a solution chamber 3 to be detected through the sample introduction three-way valve 2, and the volume of the solution to be detected is 50mL according to the running time and the flow control of the sample introduction pump 1. Then switching over the sampling three-way valve 2 to make the sample water enter the enrichment stock solution chamber 4, simultaneously opening the overflow valve 15, starting the sampling pump 1 according to the running time and the flow control of the sampling pump 1, filling the enrichment stock solution chamber 4 with the enrichment stock solution and overflowing, then closing the sampling pump 1 and the overflow valve 15, and completing the sample injection step.
The volume of the solution to be detected is 50mL, the volume of the enrichment stock solution is 450mL, and the chloride ion content in the solution to be detected and the enrichment stock solution has the same concentration when the sample injection step is completed.
And starting the constant current power supply 14, supplying 200mA constant current to the positive electrode plate 9 and the negative electrode plate 12 for 5 minutes through the constant current power supply 14, and migrating the chloride ions in the enriched stock solution to the solution to be tested under the action of an electric field to finish the operation of enriching the chloride ions. Calculating according to the volume ratio of the solution to be detected to the enrichment stock solution to obtain that the content of chloride ions in the solution to be detected is 10 times of the content before enrichment, wherein the migration principle of the chloride ions under the action of an electric field is as follows:
according to the basic principle of ionic migration, when direct current is applied to two electrode plates in water, anions in the water migrate to the positive electrode plate 9, and cations in the water migrate to the negative electrode plate 12. The chloride ions are anions, so the chloride ions move to the positive electrode plate 9 under the action of the electric field. The electrode plate on the side of the enrichment stock solution is a negative electrode plate 12, the electrode plate on the side of the stock solution to be detected is a positive electrode plate 9, and in a power-on state, chloride ions migrate from the side of the enrichment stock solution to the side of the solution to be detected. Chloride ions on the enriched stock solution side migrate to one side of the negative anion exchange membrane 11 through the negative support plate 13 and the negative electrode plate 12, wherein, all have even water distribution round holes on the negative support plate 13 and the negative electrode plate 12, the aqueous solution that contains chloride ions can flow on the negative support plate 13 and the negative electrode plate 12, when containing chloride ions and reaching the negative anion exchange membrane 11, pass the other side that reaches the negative anion exchange membrane 11 from one side of the negative anion exchange membrane 11, wherein, the aqueous solution is blocked by the negative anion exchange membrane 11 and can't penetrate, the following electrode reaction can take place for the lower surface of the positive electrode plate 9 and the negative electrode plate 12 under the power-on state simultaneously:
2H 2 O+2e - →2OH - +H 2 (negative electrode plate 12)
H 2 O→2H + +1/2O 2 +2e - (Positive electrode plate 9)
According to the above electrode reaction, hydroxyl ions are simultaneously generated on the negative electrode plate 12, which have negative charges and have the same property as chlorine ions, and migrate together with the chlorine ions toward the positive electrode plate 9 under the action of the electric field. The anion exchange resin is a resin carrying hydroxide ion groups, the hydroxide ion groups on the anion exchange resin can be replaced by chloride ions, then the hydroxide ions reaching the surface of the anion exchange resin 7 together with the chloride ions replace the chloride ions on the anion exchange resin, and the repeated replacement process of the chloride ions and the hydroxide ions is actually a chloride ion migration process. Under the action of the electric field, chloride ions continuously move towards the positive electrode plate 9, and when reaching the positive anion exchange membrane 10, the chloride ions enter the other side of the positive anion exchange membrane 10 from one side of the positive anion exchange membrane 10 and are finally dissolved in the solution to be measured.
For the sake of understanding, it should be noted that the negative electrode plate 12, the negative anion exchange membrane 11, the anion exchange resin 7, the positive anion exchange membrane 10, and the positive electrode plate 9 actually constitute a small-sized resistance element. When direct current is applied to both sides of the resistance element, chloride ions exhibiting electronegativity move from the side of the negative electrode plate 12 to the side of the positive electrode plate 9, i.e. the positive electrode plate 9 and the negative electrode plate 12 provide a power source for chloride ion migration, and the anion exchange resin 7, the positive anion exchange membrane 10 and the negative anion exchange membrane 11 realize the function of a chloride ion migration transmission channel.
After all chloride ions in the enriched stock solution are transferred into the solution to be detected, measuring the content of the chloride ions in the solution to be detected through the chloride ion selective electrode 5, transmitting a detection signal to the chloride ion display instrument 6, calculating that the content of the chloride ions in the solution to be detected is 10 times of the content of the chloride ions in the original sample water at the moment according to the volume ratio of the solution to be detected and the enriched stock solution, and finally dividing the detection signal of the electrode by 10 through the chloride ion display instrument 6 to obtain the content of the chloride ions in the sample water, wherein the lower detection limit of the chloride ion selective electrode 5 is 5 mug/L, the lower detection limit can reach 0.5 mug/L after the detection of 10 is divided, and the lower detection limit is reduced by 10 times.
After the measurement is finished, the constant current power supply 14 is firstly closed, then the discharge three-way valve 16 is switched, the solution to be measured in the solution chamber 3 to be measured is emptied, then the discharge three-way valve 16 is switched, the enrichment stock solution in the enrichment stock solution chamber 4 is emptied, and the whole solution discharge process is finished.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. An electric ion migration type trace chloride ion measuring system is characterized by comprising a shell, a chloride ion selective electrode (5), a chloride ion display instrument (6), a sample water inlet pipeline, a sample injection pump (1), a discharge pump (17), a sample water outlet pipeline and a constant current power supply (14);
a solution chamber (3) to be measured, an anode support plate (8), an anode anion exchange membrane (10), an anion exchange resin chamber (7), a cathode anion exchange membrane (11), a cathode electrode plate (12) and an enrichment stock solution chamber (4) are sequentially arranged in the shell from top to bottom, wherein anion exchange resin is filled in the anion exchange resin chamber (7);
the chloride ion selective electrode (5) is inserted into the solution chamber (3) to be tested, and the chloride ion selective electrode (5) is connected with a chloride ion display instrument (6); the sample water inlet pipeline is communicated with the inlet of the solution chamber (3) to be detected and the inlet of the enrichment stock solution chamber (4) through the sample injection pump (1); the outlet of the to-be-detected solution chamber (3) and the outlet of the enrichment stock solution chamber (4) are communicated with a sample water outlet pipeline through a discharge pump (17); the positive electrode of the constant current power supply (14) is connected with the positive electrode plate (9), and the negative electrode of the constant current power supply (14) is connected with the negative electrode plate (12).
2. The ion migration type trace chloride ion measurement system according to claim 1, further comprising a sample three-way valve (2), wherein the sample inlet pipe is communicated with a first opening of the sample three-way valve (2) through a sample pump (1), a second opening of the sample three-way valve (2) is communicated with an inlet of the solution chamber (3) to be measured, and a third opening of the sample three-way valve (2) is communicated with an inlet of the enriched stock solution chamber (4).
3. The ion migration type trace chloride measurement system according to claim 1, further comprising a discharge three-way valve (16), wherein the outlet of the solution chamber to be measured (3) is communicated with a first opening of the discharge three-way valve (16), the outlet of the concentrate solution chamber (4) is communicated with a second opening of the discharge three-way valve (16), and a third opening of the discharge three-way valve (16) is communicated with a sample water outlet pipeline through a discharge pump (17).
4. The ion migration type trace chloride ion measurement system according to claim 1, wherein a solution chamber (3) to be measured, a positive support plate (8), a positive electrode plate (9), a positive electrode anion exchange membrane (10), an anion exchange resin chamber (7), a negative electrode anion exchange membrane (11), a negative electrode plate (12), a negative support plate (13) and an enriched stock solution chamber (4) are sequentially arranged in the housing from top to bottom, wherein the anion exchange resin chamber (7) is filled with anion exchange resin.
5. The ion migration type trace chloride ion measuring system according to claim 4, wherein the positive electrode plate (9), the negative electrode plate (12), the positive support plate (8) and the negative support plate (13) are all provided with water distribution circular holes.
6. The ion migration type trace chlorine ion measuring system according to claim 1, further comprising an overflow valve (15) and an overflow outlet pipe, wherein the overflow port on the top side of the enriched stock solution chamber (4) is communicated with the overflow outlet pipe through the overflow valve (15).
7. The ion mobility trace chloride measurement system of claim 1, wherein the housing is an inverted T-shaped structure.
8. The ion migration type trace chloride ion measurement system according to claim 1, wherein the outlet of the enrichment dope chamber (4) is disposed on the side of the bottom of the enrichment dope chamber (4), and the outlet of the solution to be measured chamber (3) is disposed on the side of the bottom of the solution to be measured chamber (3).
9. The ion transport trace chloride measurement system of claim 1, wherein the sample pump (1) uses a peristaltic pump;
the discharge pump (17) uses a vacuum pump.
10. An ion migration type trace chloride ion measuring method, which is characterized in that based on the ion migration type trace chloride ion measuring system of claim 1, the method comprises the following steps:
a sample water sample enters a solution chamber (3) to be detected and an enrichment stock solution chamber (4) through a sample injection pump (1), and an overflow valve (15) is opened at the same time;
starting a constant current power supply (14), providing constant current for the positive electrode plate (9) and the negative electrode plate (12) through the constant current power supply (14), and transferring chloride ions in the enriched stock solution to the solution to be tested to finish the operation of enriching the chloride ions under the action of an electric field;
when all the chloride ions in the enriched stock solution are transferred into the solution to be detected, measuring the content of the chloride ions in the solution to be detected through the chloride ion selective electrode (5), transmitting a detection signal to the chloride ion display instrument (6), calculating the proportion of the content of the chloride ions in the solution to be detected and the content of the chloride ions in the original sample water according to the volume proportion of the solution to be detected and the enriched stock solution, and dividing the detection value of the chloride ion selective electrode (5) obtained by the chloride ion display instrument (6) by the proportion to obtain the content of the chloride ions in the sample water.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115406941A (en) * | 2022-08-23 | 2022-11-29 | 浙江西热利华智能传感技术有限公司 | Resin regeneration degree detection and cutting bed feedback system and method for fine processing system |
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| JPH06160365A (en) * | 1992-11-25 | 1994-06-07 | Japan Organo Co Ltd | Measuring method and device for negative ion contained in condensate of condensate circulation system |
| CN209974381U (en) * | 2019-02-01 | 2020-01-21 | 白银原点科技有限公司 | Dechlorination machine |
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