CN112326912A - Device for detecting ammonia nitrogen concentration in liquid - Google Patents
Device for detecting ammonia nitrogen concentration in liquid Download PDFInfo
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- CN112326912A CN112326912A CN202011216395.0A CN202011216395A CN112326912A CN 112326912 A CN112326912 A CN 112326912A CN 202011216395 A CN202011216395 A CN 202011216395A CN 112326912 A CN112326912 A CN 112326912A
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- 239000007788 liquid Substances 0.000 title claims abstract description 232
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 48
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 90
- 238000001514 detection method Methods 0.000 claims abstract description 70
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 38
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 33
- -1 ammonium ions Chemical class 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 12
- 239000000243 solution Substances 0.000 description 21
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007696 Kjeldahl method Methods 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1813—Specific cations in water, e.g. heavy metals
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The invention discloses a device for detecting the concentration of ammonia nitrogen in liquid, which is provided with a liquid containing cavity of a sample inlet pipe and a reagent pipe, wherein during detection, a liquid to be detected is firstly introduced into the liquid containing cavity by the sample inlet pipe, then a sodium hydroxide reagent liquid is introduced into the liquid containing cavity by the reagent pipe, and the pH value of the liquid to be detected is adjusted to 11 by the reagent liquid, so that ammonium ions in the liquid to be detected are converted into free ammonia gas. The gas collecting cavity is independently arranged in the liquid containing cavity, the liquid containing cavity is separated from the gas collecting cavity by the waterproof breathable film, part of free ammonia in the liquid containing cavity is collected into the gas collecting cavity through the waterproof breathable film, the ammonia concentration detection piece detects the concentration of the free ammonia in the gas collecting cavity, when the free ammonia in the liquid containing cavity and the gas collecting cavity reaches dynamic balance, the ammonia concentration detection piece feeds back a concentration signal to the controller, the controller calculates the ammonia nitrogen concentration of the liquid to be detected according to the concentration signal, the ammonia nitrogen concentration of the liquid to be detected is automatically acquired, the operation is more convenient, the detection result is more accurate, the detection precision and the operation convenience are improved.
Description
Technical Field
The invention relates to the technical field of ammonia nitrogen concentration detection, in particular to a device for detecting ammonia nitrogen concentration in liquid.
Background
In the field of aquaculture, ammonia nitrogen in a culture pond mainly contains nitrogen in the forms of free ammonia (NH3) and ammonium ions (NH4+), the concentration of the ammonia nitrogen in the culture pond is increased along with the increase of sediments such as excrement, and when the concentration of the ammonia nitrogen is high, the ammonia nitrogen not only threatens the lives of aquatic organisms such as fishes, but also pollutes underground water, so that the detection of the concentration of the ammonia nitrogen is particularly necessary.
The existing common ammonia nitrogen concentration detection methods mainly comprise a spectrophotometric method, a Kjeldahl method and an ammonia gas-sensitive electrode method, wherein although the spectrophotometric method has higher sensitivity, chemical reagents in the method are easy to cause secondary pollution to ammonia nitrogen sample liquid, and the accuracy of a detection result is influenced. The equipment structure related to the Kjeldahl method and the ammonia gas-sensitive electrode method is usually complex and inconvenient to operate.
Therefore, improving the detection accuracy and the operation convenience is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a device for detecting an ammonia nitrogen concentration in a liquid, in which a reagent liquid is used to adjust a pH value of a liquid to be detected in a liquid containing cavity to 11 at a preset temperature, so that ammonium ions in the liquid to be detected are converted into free ammonia gas, the free ammonia gas passes through a water-proof gas-permeable membrane and is collected into a gas collection cavity, and a controller counts the ammonia nitrogen concentration of the liquid to be detected according to a signal fed back by an ammonia gas concentration detecting element disposed in the gas collection cavity.
The specific scheme is as follows:
the utility model provides an ammonia nitrogen concentration detection device in liquid, includes:
the reagent liquid flowing out of the reagent tube is used for adjusting the pH value of the liquid to be detected flowing out of the sample tube to 11 at a preset temperature so as to convert ammonium ions in the liquid to be detected into free ammonia gas;
the gas collecting cavity is independently arranged in the liquid containing cavity, and the liquid containing cavity and the gas collecting cavity are separated by a water-proof gas-permeable film so that free ammonia gas in the liquid containing cavity is collected into the gas collecting cavity through the water-proof gas-permeable film;
the ammonia concentration detection part is used for detecting the concentration of free ammonia in the gas collection cavity;
and the controller is used for calculating the ammonia nitrogen concentration of the liquid to be detected when the free ammonia gas in the liquid containing cavity and the gas collecting cavity reaches dynamic balance according to the concentration information fed back by the ammonia concentration detection piece.
Preferably, the device further comprises a display screen connected with the controller, and the controller is used for controlling the display screen to display the ammonia nitrogen concentration of the liquid to be detected in real time.
Preferably, the sampling pipe is provided with a liquid inlet valve and further comprises a liquid level detection part for detecting the liquid level of the liquid to be detected in the liquid containing cavity, the liquid inlet valve and the liquid level detection part are both connected with the controller, and the controller is used for controlling the liquid inlet valve to be closed when the liquid level of the liquid to be detected in the liquid containing cavity reaches a preset height according to a signal sent by the liquid level detection part.
Preferably, the reagent pipe is provided with a reagent valve, and further comprises a pH value detection part for detecting the pH value of the mixed liquid in the liquid containing cavity after the liquid to be detected is mixed with the reagent liquid, the reagent valve and the pH value detection part are both connected with the controller, and the controller is used for controlling the reagent valve to be closed when the pH value of the mixed liquid reaches 11 according to a signal fed back by the pH value detection part.
Preferably, still including the casing that has flourishing liquid chamber and locate the casing periphery and be used for adjusting the temperature regulator of flourishing liquid intracavity mixed liquid temperature and be used for detecting the temperature detection piece of flourishing liquid intracavity mixed liquid temperature, the temperature regulator all links to each other with the controller with temperature detection piece, the controller is used for starting the temperature regulator according to the signal that temperature detection piece feedback and predetermines the temperature of mixed liquid and heat or refrigerate mixed liquid correspondingly until the temperature of mixed liquid is unanimous with predetermineeing the temperature.
Preferably, the waterproof breathable film further comprises a protective sleeve sleeved on the periphery of the waterproof breathable film, and the protective sleeve is provided with a vent hole.
Preferably, a drying layer is arranged in the waterproof breathable film.
Preferably, the bottom of the shell is provided with a drain pipe, and the drain pipe is provided with a drain valve.
Preferably, the drain pipe is provided with a drain pump.
Preferably, the shell is a transparent shell, and the transparent shell is provided with scale marks for indicating the height of the liquid level.
Compared with the background art, the device for detecting the concentration of ammonia nitrogen in liquid comprises a liquid containing cavity, a gas collecting cavity, an ammonia gas concentration detection part and a controller, wherein the liquid containing cavity is provided with a sample inlet pipe and a reagent pipe, a certain amount of liquid to be detected is firstly introduced into the liquid containing cavity by using the sample inlet pipe during detection, then sodium hydroxide reagent liquid is introduced into the liquid containing cavity by using the reagent pipe, the reagent liquid and the liquid to be detected are mixed at a preset temperature, and the pH value of the liquid to be detected is adjusted to 11 by using the reagent liquid, so that ammonium ions in the liquid to be detected are converted into free ammonia gas. The gas collecting cavity is independently arranged in the liquid containing cavity, the liquid containing cavity and the gas collecting cavity are separated by the water-proof breathable film, part of free ammonia in the liquid containing cavity is collected into the gas collecting cavity through the water-proof breathable film, the ammonia concentration detecting piece detects the concentration of the free ammonia in the gas collecting cavity, when the free ammonia in the liquid containing cavity and the gas collecting cavity reaches dynamic balance, the ammonia concentration detecting piece feeds back a concentration signal to the controller, and the controller calculates the ammonia nitrogen concentration of the liquid to be detected according to the concentration signal, so that the ammonia nitrogen concentration of the liquid to be detected is automatically obtained, the operation is convenient, and the detection result is accurate, and therefore the detection precision and the operation convenience of the ammonia nitrogen concentration detecting device in the liquid are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a device for detecting ammonia nitrogen concentration in liquid according to an embodiment of the present invention.
The reference numbers are as follows:
the device comprises a shell 1, a liquid containing cavity 2, a sample inlet pipe 3, a reagent pipe 4, a gas collecting cavity 5, a water-proof and gas-permeable film 6, an ammonia gas concentration detection piece 7, a controller 8, a display screen 9, a pH value detection piece 10, a temperature detection piece 11, a protective sleeve 12, a drying layer 13, a drain pipe 14 and a liquid discharge pump 15;
a sample injection piston 31;
a reagent piston 41;
a vent 121.
Detailed Description
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, and not all of the embodiments. 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.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a device for detecting ammonia nitrogen concentration in liquid according to an embodiment of the present invention.
The embodiment of the invention discloses a device for detecting the concentration of ammonia nitrogen in liquid, which comprises a liquid containing cavity 2, a gas collecting cavity 5, an ammonia gas concentration detection piece 7 and a controller 8, wherein the liquid containing cavity 2 is used for containing liquid to be detected and reagent liquid. The housing 1 has a liquid receiving chamber 2. In order to conveniently observe the height of the liquid level in the liquid containing cavity 2, the shell 1 can be a transparent shell, and scale marks for indicating the height of the liquid level are arranged on the outer side surface of the transparent shell. The transparent shell can be made of glass or plastic materials, but no matter what materials are used, the transparent shell is ensured to have good acid and alkali resistance.
In order to facilitate drainage, the bottom of the casing 1 is provided with a drain pipe 14, and the drain pipe 14 is provided with a drain valve. After the detection is finished, the drain valve is opened, and the mixed liquid in the liquid containing cavity 2 is discharged from the drain pipe 14. Further, drain pipe 14 is equipped with positive displacement pump 15, and during the flowing back, start positive displacement pump 15, positive displacement pump 15 pumps the mixed liquid in flourishing liquid chamber 2, and convenient flourishing liquid chamber 2 drains clean mixed liquid, avoids influencing next detection precision.
The liquid containing cavity 2 is provided with a sample inlet pipe 3 and a reagent pipe 4, when in detection, a certain amount of liquid to be detected is firstly introduced into the liquid containing cavity 2 by the sample inlet pipe 3, and when the liquid to be detected reaches a certain volume, the introduction of the liquid to be detected is stopped; and then, introducing 1mol/L sodium hydroxide reagent solution into the solution containing cavity 2 by using the reagent tube 4, mixing the reagent solution and the solution to be detected at a preset temperature, adjusting the pH value of the solution to be detected to 11 by using the reagent solution, and stopping introducing the reagent solution to convert ammonium ions in the solution to be detected into free ammonia gas. The sampling tube 3 and the reagent tube 4 can be plastic tubes.
In addition, a sample injection piston 31 is arranged in the sample injection pipe 3, and the sample injection piston 31 is used for controlling the liquid inlet amount and the sample injection speed of the sample injection pipe 3. Similarly, a reagent piston 41 is provided in the reagent tube 4, and the reagent piston 41 controls the amount of the reagent in the reagent tube 4 and the reagent addition rate.
It should be noted that the predetermined temperature is an optimum temperature for maximum conversion of ammonium ions in the solution to be measured into free ammonia gas, and is related to the components of the solution to be measured, and is not limited herein.
The gas collecting cavity 5 is independently arranged in the liquid containing cavity 2, the liquid containing cavity 2 and the gas collecting cavity 5 are separated by a water-proof breathable film 6, and part of free ammonia gas in the liquid containing cavity 2 is collected into the gas collecting cavity 5 through the water-proof breathable film 6, so that the gas collecting cavity 5 can contain a certain volume of free ammonia gas. The waterproof breathable film 6 can be made of polytetrafluoroethylene, polyethylene or polypropylene, so that the waterproof breathable film 6 has good acid and alkali resistance.
In order to prolong the service life of the water-proof and breathable film 6, the invention also comprises a protective cover 12 sleeved on the periphery of the water-proof and breathable film 6, the protective cover 12 is provided with a vent hole 121, and free ammonia penetrates through the water-proof and breathable film 6 through the vent hole 121. The protecting jacket 12 can prevent the water-proof and breathable film 6 from deforming, and can isolate the gas collecting cavity 5 in the liquid containing cavity 2. The protective sleeve 12 is a plastic sleeve, and has good acid and alkali resistance.
Be equipped with dry layer 13 in the water proof ventilated membrane 6, dry layer 13 is used for absorbing the moisture in the gas collection chamber 5, guarantees that the free ammonia volume in the gas collection chamber 5 reaches the biggest, makes things convenient for ammonia concentration detection spare 7 accurate detection gas collection chamber 5 in the concentration of free ammonia. The drying layer 13 comprises one or more of silica gel drying agent or calcium chloride drying agent.
The ammonia concentration detection piece 7 detects the concentration of free ammonia in the gas collection chamber 5, and the ammonia concentration detection piece 7 is specifically a semiconductor ammonia concentration sensor, but the type is not limited thereto.
The ammonia concentration detection piece 7 is connected with the controller 8, under the condition of preset temperature, when the free ammonia in the liquid containing cavity 2 and the gas collecting cavity 5 reaches dynamic balance, the ammonia concentration detection piece 7 feeds back a concentration signal to the controller 8, and the controller 8 calculates the ammonia nitrogen concentration of the liquid to be detected according to the stored ammonia concentration calculation formula, so that the ammonia nitrogen concentration of the liquid to be detected is automatically obtained, the operation is more convenient, and the detection result is more accurate.
In this embodiment, casing 1 is equipped with the holding tank that is used for holding controller 8, and the holding tank integral type is located on casing 1, avoids the liquid in flourishing liquid chamber 2 to influence controller 8. The controller 8 comprises a central processing module for processing signals and an analog circuit board for amplifying current signals, and an external power line passes through the top cover of the shell 1 and is connected with the analog circuit board.
In conclusion, the detection precision and the operation convenience of the device for detecting the concentration of ammonia nitrogen in liquid provided by the invention are improved.
In order to facilitate the detection personnel to visually acquire the ammonia nitrogen concentration of the liquid to be detected, the invention also comprises a display screen 9 connected with the controller 8, the controller 8 sends the ammonia nitrogen concentration of the liquid to be detected to the display screen 9, and the display screen 9 is controlled to display the ammonia nitrogen concentration of the liquid to be detected in real time. The display screen 9 is fixedly arranged on the top cover of the shell 1, and the display screen 9 is connected with the analog circuit board through a power line.
The reagent pipe 4 is provided with a liquid inlet valve which is specifically an electromagnetic valve. The invention also comprises a liquid level detection piece, the liquid level detection piece is used for detecting the liquid level height of the liquid to be detected in the liquid containing cavity 2, and the liquid level detection piece can be a liquid level sensor. The liquid inlet valve and the liquid level detection part are both connected with the controller 8. When the liquid level detection piece detects that the liquid level of the liquid to be detected in the liquid containing cavity 2 reaches the preset height, the liquid level detection piece sends a signal to the controller 8, the controller 8 controls the liquid inlet valve to be closed, the liquid inlet pipe automatically stops leading in the liquid to be detected, the automation degree is high, the volume of the liquid to be detected in the liquid containing cavity 2 can be accurately controlled, and adjustment is provided for obtaining an accurate detection result. The preset height refers to the maximum liquid level height of the liquid to be measured in the liquid containing cavity 2, and can be input into the controller 8 in advance according to the volume of the liquid containing cavity 2.
Further, the reagent tube 4 is provided with a reagent valve, which is specifically an electromagnetic valve. Correspondingly, the invention also comprises a pH value detection part 10, wherein the pH value detection part 10 is used for detecting the pH value of the mixed liquid in the liquid containing cavity 2 after the liquid to be detected is mixed with the reagent liquid, and the pH value detection part 10 is specifically a pH value sensor. Reagent valve and pH value detection piece 10 all link to each other with controller 8, and when pH value detection piece 10 detected the pH value of mixed liquid and reached 11, pH value detection piece 10 feedback signal to controller 8, controller 8 control reagent valve closed, and reagent pipe 4 automatic stop lets in reagent liquid, and degree of automation further improves to some extent, can accurately guarantee that the pH value of mixed liquid reaches 11, is favorable to further promoting detection accuracy.
Furthermore, the invention also comprises a temperature regulator and a temperature detection part 11 which are respectively connected with the controller 8, wherein the temperature regulator is fixedly arranged on the periphery of the shell 1 and is used for regulating the temperature of the mixed liquid in the liquid containing cavity 2. When the temperature of the mixed liquid is higher than the preset temperature, the temperature regulator refrigerates the liquid containing cavity 2, and reduces the temperature of the mixed liquid in the liquid containing cavity 2 until the temperature of the mixed liquid reaches the preset temperature. When the temperature of the mixed liquid is lower than the preset temperature, the temperature regulator heats the liquid containing cavity 2, and the temperature of the mixed liquid in the liquid containing cavity 2 is increased until the temperature of the mixed liquid reaches the preset temperature. When the temperature of the mixed liquid is equal to the preset temperature, the temperature regulator does not work.
The temperature detecting element 11 is used for detecting the temperature of the mixed liquid in the liquid containing cavity 2, and can be a temperature sensor.
The controller 8 judges whether the temperature of the mixed liquid is consistent with the preset temperature or not according to the temperature signal fed back by the temperature detection piece 11, and if so, the temperature regulator is controlled not to work; if not, the controller 8 starts the temperature regulator to heat or refrigerate, correspondingly increases or decreases the temperature of the mixed liquid until the temperature of the mixed liquid is consistent with the preset temperature, so that the temperature of the mixed liquid in the liquid containing cavity 2 is automatically adjusted, the temperature of the mixed liquid in the liquid containing cavity 2 is kept constant, ammonium ions in the liquid to be detected are converted into free ammonia gas to the maximum extent, and the detection result is more accurate.
The working principle of the device for detecting the concentration of ammonia nitrogen in liquid provided by the invention is as follows:
firstly, a certain amount of liquid to be detected is introduced into the liquid containing cavity 2 by using the sample inlet pipe 3, and when the volume of the liquid to be detected reaches a certain volume, the introduction of the liquid to be detected is stopped;
then, 1mol/L of sodium hydroxide reagent solution is introduced into the solution containing cavity 2 by using the reagent tube 4, the reagent solution and the solution to be detected are mixed at a preset temperature, the pH value of the solution to be detected is adjusted to 11 by the reagent solution, the introduction of the reagent solution is stopped, ammonium ions in the solution to be detected are converted into free ammonia gas, and part of the free ammonia gas in the solution to be detected passes through the waterproof breathable film 6 from the vent hole 121, is dried by the drying layer 13 and then is collected into the gas collecting cavity 5;
under the condition of preset temperature, when the free ammonia in the liquid containing cavity 2 and the gas collecting cavity 5 reaches dynamic balance, the ammonia concentration detection part 7 in the gas collecting cavity 5 feeds back a concentration signal to the controller 8, the controller 8 calculates the ammonia nitrogen concentration of the liquid to be detected, and controls the display screen 9 to display the ammonia nitrogen concentration of the liquid to be detected;
the liquid discharge pump 15 is started, the liquid discharge pump 15 sucks the mixed liquid in the liquid containing chamber 2, and the mixed liquid is discharged from the water discharge pipe 14.
The device for detecting the concentration of ammonia nitrogen in liquid provided by the invention is described in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The utility model provides an ammonia nitrogen concentration detection device in liquid which characterized in that includes:
the liquid containing cavity (2) is provided with a sample inlet pipe (3) and a reagent pipe (4), and the reagent liquid flowing out of the reagent pipe (4) is used for adjusting the pH value of the liquid to be detected flowing out of the sample inlet pipe (3) to 11 at a preset temperature so as to convert ammonium ions in the liquid to be detected into free ammonia gas;
the gas collecting cavity (5) is independently arranged in the liquid containing cavity (2), and the liquid containing cavity (2) and the gas collecting cavity (5) are separated by the water-proof and gas-permeable film (6) so that free ammonia gas in the liquid containing cavity (2) is collected into the gas collecting cavity (5) through the water-proof and gas-permeable film (6);
an ammonia concentration detection piece (7) for detecting the concentration of free ammonia in the gas collection cavity (5);
and the controller (8) is connected with the ammonia concentration detection piece (7), and the controller (8) is used for calculating the ammonia nitrogen concentration of the liquid to be detected when the free ammonia in the liquid containing cavity (2) and the gas collecting cavity (5) reaches dynamic balance according to the concentration information fed back by the ammonia concentration detection piece (7).
2. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 1, further comprising a display screen (9) connected with the controller (8), wherein the controller (8) is used for controlling the display screen (9) to display the concentration of ammonia nitrogen in the liquid to be detected in real time.
3. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 1, wherein the sampling pipe (3) is provided with a liquid inlet valve, and further comprises a liquid level detection part for detecting the liquid level of the liquid to be detected in the liquid containing cavity (2), the liquid inlet valve and the liquid level detection part are both connected with the controller (8), and the controller (8) is used for controlling the liquid inlet valve to be closed when the liquid level of the liquid to be detected in the liquid containing cavity (2) reaches a preset height according to a signal sent by the liquid level detection part.
4. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, wherein the reagent pipe (4) is provided with a reagent valve, and further comprises a pH value detection part (10) for detecting the pH value of the mixed liquid in the liquid containing cavity (2) after the liquid to be detected and the reagent liquid are mixed, the reagent valve and the pH value detection part (10) are both connected with the controller (8), and the controller (8) is used for controlling the reagent valve to be closed when the pH value of the mixed liquid reaches 11 according to a signal fed back by the pH value detection part (10).
5. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, further comprising a housing (1) having the liquid containing cavity (2), a temperature regulator disposed on the periphery of the housing (1) and used for regulating the temperature of the mixed liquid in the liquid containing cavity (2), and a temperature detecting member (11) used for detecting the temperature of the mixed liquid in the liquid containing cavity (2), wherein the temperature regulator and the temperature detecting member (11) are both connected to the controller (8), and the controller (8) is used for starting the temperature regulator to correspondingly heat or refrigerate the mixed liquid until the temperature of the mixed liquid is consistent with the preset temperature according to a signal fed back by the temperature detecting member (11) when the temperature of the mixed liquid is inconsistent with the preset temperature.
6. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, further comprising a protective cover (12) covering the periphery of the water-proof and air-permeable membrane (6), wherein the protective cover (12) is provided with a vent hole (121).
7. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, wherein a drying layer (13) is arranged in the water-proof and breathable film (6).
8. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 5, wherein a drain pipe (14) is arranged at the bottom of the shell (1), and the drain pipe (14) is provided with a drain valve.
9. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 8, wherein the drain pipe (14) is provided with a drain pump (15).
10. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 5, wherein the shell (1) is a transparent shell, and the transparent shell is provided with scale marks for indicating the height of the liquid level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216395.0A CN112326912A (en) | 2020-11-04 | 2020-11-04 | Device for detecting ammonia nitrogen concentration in liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011216395.0A CN112326912A (en) | 2020-11-04 | 2020-11-04 | Device for detecting ammonia nitrogen concentration in liquid |
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| CN112326912A true CN112326912A (en) | 2021-02-05 |
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| CN202011216395.0A Pending CN112326912A (en) | 2020-11-04 | 2020-11-04 | Device for detecting ammonia nitrogen concentration in liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112578097A (en) * | 2021-03-01 | 2021-03-30 | 广州乐盈信息科技股份有限公司 | Water quality analysis system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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