CN106442487A - Online ammonia nitrogen monitor - Google Patents
Online ammonia nitrogen monitor Download PDFInfo
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- CN106442487A CN106442487A CN201610725503.4A CN201610725503A CN106442487A CN 106442487 A CN106442487 A CN 106442487A CN 201610725503 A CN201610725503 A CN 201610725503A CN 106442487 A CN106442487 A CN 106442487A
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- sample
- ammonia nitrogen
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- reaction unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
The invention relates to the technical field of automatic water quality monitoring apparatuses, and provides an online ammonia nitrogen monitor. The online ammonia nitrogen monitor comprises a cabinet, and a reaction device, a liquid conveying system and a system control terminal which are arranged in the cabinet, a sample and all reagents are metered by the liquid conveying system in batches and are conveyed to the reaction device in a metering sequence, one-time or multi-time cleaning of the liquid conveying channel of the monitor after every liquid conveying to the reaction device, the sample and all the reagents undergo a color development reaction in the reaction device, the absorbance of the sample is obtained, and the obtained absorbance is converted into practical ammonia nitrogen content by the system control terminal. The online ammonia nitrogen monitor avoids personal error brought by artificial measurement, reduces mutual influences of the sample and all the reagents in the conveying process, and improves the stability and the accuracy of a test result in order to obtain the accurate content of ammonia nitrogen in the sample.
Description
Technical field
The present invention relates to water quality automatic monitoring device technical field, more particularly, to a kind of ammonia nitrogen on-line computing model.
Background technology
Ammonia nitrogen refers to the ammonia existing in water with free ammonia and ammonium ion form.In water, ammonia-nitrogen content refers to ammonia or ammonium when increasing
The compound that ionic species exists.Therefore, pollution sources ammonia nitrogen on-line computing model being installed on ad-hoc location go out, and 24 hours continuous
Constantly pollution sources are carried out with the instrument of ammonia nitrogen analysis.
Ammonia nitrogen on-line computing model operation principle is based on reagent colorimetric method, and its principle is：The alkalescence of mercuric iodixde and KI is molten
Liquid and ammonia react the light red brown colloidal state compound of generation, and its colourity is proportional with ammonia-nitrogen content, by can wavelength 410～
Detect its absorbance in the range of 425nm, to measure its content.
At present, existing ammonia nitrogen on-line monitoring instrument is manual intervention, need to show auxiliary tone reagent, and in delivery of therapeutic agents
Carry out in course of reaction with water sample, the cleannes of instrument are difficult to keep, thus leading to measuring accuracy low, test result error is big
Problem.
Content of the invention
In sum, it is an object of the invention to provide a kind of ammonia nitrogen on-line computing model exists it is intended to solve existing ammonia nitrogen
Line monitor needs manual intervention and instrument itself clean degree to be difficult to keep led to final testing result in test process
Error is big, the low problem of measuring accuracy.
The present invention is achieved in that ammonia nitrogen on-line computing model, including cabinet and in described cabinet reaction unit,
Transfusion system and system control terminal：
, there is chromogenic reaction for sample with reagent, to obtain the absorbance of sample in described reaction unit；
Described transfusion system, is communicated in described reaction unit, sample and each reagent is measured in batches and presses metering suitable
Sequence is transmitted successively to described reaction unit；
Described system control terminal, is electrically connected to described reaction unit, described absorbance is scaled actual ammonia nitrogen and contains
Amount, described system control terminal is electrically connected to described transfusion system to control described transfusion system automatic transport liquid to be detected
Body, after often completing once to infuse to described reaction unit, described system control terminal controls described transfusion system in instrument
All infusion channel carry out one or many cleaning.
Further, described transfusion system includes providing the drive mechanism of transmission power, being used for sample and each reagent
The part flow arrangement of shunting sample and each reagent and metering device, described metering device and described reaction unit are all communicated in institute
State part flow arrangement, described system control terminal is electrically connected to described driving structure and described part flow arrangement, sample and each reagent
After sequentially passing through described part flow arrangement shunting, enter described metering device and measured, sample and each reagent after the completion of metering
Return described part flow arrangement and carry out chromogenic reaction in described reaction unit finally to converge at, often complete one to described reaction unit
After secondary transfusion, described system control terminal controls described drive mechanism and described part flow arrangement to all infusion channel in instrument
Carry out one or many cleaning.
Specifically, described part flow arrangement is a multiple-way valve group, and wherein one valve port of described multiple-way valve group passes through a conduit even
Lead in described metering device, another valve port of described multiple-way valve group is communicated in described reaction unit by a conduit, described lead to more
Other valve ports of valve group are respectively communicated with sample and each reagent by some conduits；
Or, described part flow arrangement is a multi-joint magnetic valve, and one end of described multi-joint magnetic valve is connected by some conduits
In sample, each reagent and cleaning agent, the described multi-joint magnetic valve other end is communicated in described metering device by a conduit, described
3rd end of multi-joint magnetic valve is communicated in described reaction unit by a conduit.
Further, described metering device include gauge line and multiple for detecting sample or reagent in described gauge line
The light metering unit of liquid level, each described light metering unit is sequentially arranged in described gauge line along the axial direction of described gauge line
Side wall on, described gauge line is communicated in described part flow arrangement, and each described light metering unit is electrically connected to described drive mechanism.
Further, described reaction unit include housing, the reaction tank in described housing and being used for detect described
The detection means of reactant liquor absorbance in reaction tank, described detection means is in described housing.
Further, also include one and stop liquid valve, described only liquid valve one end is communicated in described reaction unit, described only liquid valve
The other end is communicated in described metering device.
Further, the first installing plate and the second installing plate are also included, described first installing plate is vertically erected on described machine
The bottom of case, and described cabinet inner chamber is separated into cup and rear chamber, described reaction unit and described transfusion system are located at institute
State in cup and be fixedly connected on installing plate, described second installing plate is horizontally placed on the top ends of described first installing plate,
Described system control terminal is on described second installing plate.
Further, some kits are also included, each described kit is in described cup.
Further, also include a display screen, described display screen is electrically connected to described system control terminal and located at described
Outside cabinet.
Compared with prior art, the ammonia nitrogen on-line computing model that the present invention provides, and each is tried sample using transfusion system
Agent is measured by batch, after the completion of and sequentially input by metering order and carry out chromogenic reaction to reaction unit, and, every
Secondary complete transmission action after all to instrument, all infusion channel carry out one or many cleaning, so, it is to avoid institute during manual measurement
The human error brought, and reduce influencing each other in transmitting procedure between sample and each reagent, improve test result
Stability and accuracy, thus obtaining the exact level of ammonia nitrogen in sample.
Brief description
Fig. 1 is the explosive view of ammonia nitrogen on-line computing model provided in an embodiment of the present invention；
Fig. 2 is the front view of ammonia nitrogen on-line computing model provided in an embodiment of the present invention；
Fig. 3 is the front view of part flow arrangement provided in an embodiment of the present invention；
Fig. 4 is the structural representation of reaction unit provided in an embodiment of the present invention；
Fig. 5 is sample ammonia-nitrogen content overhaul flow chart provided in an embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
It should be noted that when element is referred to as on " being fixed on " or " being arranged at " another element, it can be direct
On another element or be connected on another element.When an element is known as " connection " another element, it can
To be to be directly connected to another element or be indirectly connected on this another element.
Also, it should be noted the orientation term such as left and right, upper and lower, top in the present embodiment, bottom, it is only relatively general each other
Read or with the normal operating condition of product as reference, and should not be regarded as restrictive.
Below in conjunction with specific embodiment, the realization of the present invention is described in detail.
Refer to Fig. 1, ammonia nitrogen on-line computing model provided in an embodiment of the present invention, including cabinet 1 and in cabinet 1
Reaction unit 2, transfusion system 3 and system control terminal 4, sample and each reagent are counted in batches by transfusion system 3
Measure and press metering sequential delivery to reaction unit 2, sample and each reagent occur chromogenic reaction in reaction unit 2, and obtain
The absorbance system control terminal 4 of sample is electrically connected to reaction unit 2 to change the absorbance of acquisition through system control terminal 4
It is counted as actual ammonia-nitrogen content, system control terminal 4 is electrically connected to transfusion system 3 to control transfusion system 3 automatic transport to be detected
Liquid, after often completing once to infuse to reaction unit 2, system control terminal 4 control transfusion system 2 to all defeated in instrument
Liquid passage carries out one or many cleaning.
Sample and each reagent are pressed batch using transfusion system 3 by ammonia nitrogen on-line computing model provided in an embodiment of the present invention
Measured, after the completion of and sequentially input by metering order and carry out chromogenic reaction to reaction unit 2, and, complete every time
All one or many cleaning is carried out to instrument all of infusion channel portion after transmission action, so, it is to avoid carried during manual measurement
The human error come, and reduce influencing each other in transmitting procedure between sample and each reagent, improve test result
Stability and accuracy, thus obtain the exact level of ammonia nitrogen in sample.
Further, refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 5, in the present embodiment, transfusion system 3 includes drive mechanism
31st, part flow arrangement 32 and metering device 33, system control terminal 4 is electrically connected to driving structure 31 and part flow arrangement 32, metering
Device 33 and reaction unit 2 are all communicated in part flow arrangement 32, and under the driving force of drive mechanism 31, sample and each reagent are successively
After part flow arrangement 32 shunting, enter metering device 33 and measured, after the completion of metering, sample and each reagent return shunting
Device 32 carries out chromogenic reaction finally to converge in reaction unit 2, after often completing once to infuse to reaction unit 2, system control
Terminal 4 processed controls drive mechanism 31 and part flow arrangement 32 to carry out one or many cleaning to all infusion channel in instrument.This
Sample, reduces influencing each other in transmitting procedure between sample and each reagent, improves the accuracy of test result.Specifically,
Drive mechanism 31 is a peristaltic pump, the advantage of peristaltic pump be not with reagent directly contact, using pressure differential realize sample and
Each reagent is transmitted to metering device 33 by part flow arrangement 32, and can achieve rotate and reverse.Sample and the logical circulation road of each reagent
Footpath is：Under peristaltic pump forward drive power, sample or reagent enter in metering device 33 after part flow arrangement 32 shunting, metering
After going out institute's expense, peristaltic pump inverts, and the sample in metering device 33 or reagent are back in part flow arrangement 32, finally, then
Come together in reaction unit 2 through part flow arrangement 32.When system control terminal 4 controls drive mechanism 31 and part flow arrangement 32 to complete
After above-mentioned infusion process, then transfusion object is switched to cleaning agent, this cleaning agent will flow through part flow arrangement 32 and metering device 33,
Finally it is back at part flow arrangement 32 and is expelled to outside, so, to passage and the metering dress for transfusion in part flow arrangement 32
Put 33 for metering passage carry out one or many and clean phase to reduce between sample and each reagent in transmitting procedure
Mutually affect.
Specifically, refer to Fig. 2 and Fig. 3, in the present embodiment, part flow arrangement 32 is a multiple-way valve group, multiple-way valve group
Wherein one valve port is communicated in metering device 33 by a conduit, and another valve port of multiple-way valve group is communicated in reaction dress by a conduit
Put 2, other valve ports of multiple-way valve group are respectively communicated with reagent, each reagent and cleaning agent, i.e. sample, each examination by some conduits
Agent and cleaning agent can be sequentially entered in metering device 33 by multiple-way valve group respectively, thus reaching the purpose of shunting, enter meter
After completing metering in amount device 33, it is back in multiple-way valve group by former road, then enter reaction unit 2 from a valve port of multiple-way valve group
Interior.Preferably, part flow arrangement 32 is one or nine port valve groups, and nine port valve groups have the first valve port 321, the second valve port 322, the 3rd valve port
323rd, the 4th valve port 324, the 5th valve port 325, the 6th valve port 326, the 7th valve port 327, the 8th valve port 328 and the 9th valve port
329, wherein, the first valve port 321 is communicated in metering device 33 by conduit, and the 9th valve port 329 is communicated in reaction dress by conduit
Put 2, remaining valve port is respectively communicated with sample, each reagent and cleaning agent, and for example, the second valve port 322 is communicated in examination by conduit
Sample, when need measure corresponding sample at the second valve port 322, the first valve port 321 and the second valve port 322 are opened, and remaining valve port closes
Close, sample enters in nine port valve groups by the second valve port 322, then flowed out in metering device 33 by the first valve port 321 and carry out
Metering, after completing metering, the first valve port 321 and the 9th valve port 329 are all opened, and remaining valve port closes, so, measured examination
Sample is entered in nine port valve groups by the first valve port 321, then is flowed out in reaction unit 2 by the 9th valve port 329.In the same manner, other valves
The corresponding reagent of mouth enters in reaction unit 2 also by above-mentioned transmission means.
Or, in figure is not shown, in the present embodiment, part flow arrangement 32 is a multi-joint magnetic valve, one end of multi-joint magnetic valve
It is communicated in sample, each reagent and cleaning agent by some conduit (not shown), the other end of multi-joint magnetic valve is led by one
Pipe is communicated in metering device 33, and the 3rd end of multi-joint magnetic valve is communicated in reaction unit 2 by a conduit.So, multi-joint electromagnetism
One end of valve is connected with sample, each reagent and cleaning agent respectively, and that is, sample, each reagent and cleaning agent can be respectively by multi-joint
Magnetic valve sequentially enters in metering device 33, thus reaching the purpose of shunting, enters after completing metering in metering device 33, by former
Road is back in multiple-way valve group, then is entered in reaction unit 2 by multi-joint magnetic valve.
Further, refer to Fig. 1 and Fig. 2, metering device 33 includes gauge line 331 and multiple light metering unit 332,
Each light metering unit 332 along gauge line axial direction be sequentially arranged in gauge line 331 side wall on, gauge line 331 is communicated in point
Stream device 32, each light metering unit 332 is electrically connected to drive mechanism 32.Specifically, light metering unit 332 includes optical transmitting set
The 33a and optical receiver 33b corresponding with this optical transmitting set 33a, optical transmitting set 33a and optical receiver 33b is along gauge line 331
Radial direction be relatively arranged on the both sides of gauge line 331, under normal operating conditions, optical transmitting set 33a is always maintained at light beam
Send, and received by optical receiver 33b, when liquid level in gauge line 331 of sample or reagent stops light beam so that optical receiver
When 33b does not have receiving light beam, complete once to measure, now, the motor reversal of drive mechanism 31, the sample that finish metering or examination
Agent is discharged from gauge line 331 and is back in part flow arrangement 32, and, the gap in each meters reagents, all repeats above-mentioned dynamic
Make to carry out one or many metering to cleaning agent, for cleaning part flow arrangement 32 and gauge line 331.Preferably, in this enforcement
In example, in normal operating conditions, gauge line 331 is in vertical state, and is provided with gauge line 331 and is respectively arranged at the two ends with a light
Metering units 332, thus obtaining two kinds of metric results, certainly, according to being specifically actually needed, can arrange many on gauge line 331
Individual light metering unit 332.
Further, refer to Fig. 1, Fig. 2 and Fig. 4, in the present embodiment, reaction unit 2 includes housing 21, reaction tank 22
And detection means 23.At a certain temperature, sample and each reagent carry out chromogenic reaction in reaction tank 22, and by detection
Device 23 is carried out absorbance detection before the reaction afterwards respectively, and the difference of both sides detection is then the absorbance of sample.Specifically,
Reaction tank 22 is in housing 21 and is enclosed in the dark surrounds setting formation, and detection means 23 is a spectrophotometer, including located at anti-
Answer the luminous end 231 of pond 22 side and located at reaction tank 22 opposite side receiving terminal 232, by detection reagent before the reaction after
The situation of change of wavelength, draws the absorbance of sample.
Further, refer to Fig. 2, in the present embodiment, also include one and stop liquid valve 5, only liquid valve 5 one end is communicated in reaction
The other end that device 2 stops liquid valve is communicated in metering device 33.Only the effect of liquid valve 5 is to control each examination entering in reaction unit 2
Agent and sample and prevent the reactant liquor in reaction unit 2 to be back in metering device 33.
Further, refer to Fig. 1 to Fig. 3, in the present embodiment, also include the first installing plate 61 and the second installing plate
62, the first installing plate 61 is vertically erected on the bottom of cabinet 1, and by cabinet 1 inner chamber be separated into cup (not shown) and after
Room (not shown), reaction unit 2 and transfusion system 3 are located in cup and are fixedly connected on the first installing plate 61, the second installation
Plate 62 is horizontally placed on the top ends of the first installing plate 61, and system control terminal 4 is provided with the top of the second installing plate 6.So,
It is easy to regular maintenance management, and take full advantage of the space in cabinet 1.
Further, refer to Fig. 1 and Fig. 2, in the present embodiment, also include some kits 8, each kit 8 located at
In cup.Preferably, each kit 8, side by side in cup, so, sample, each reagent and cleaning agent can be held respectively
In corresponding kit 8, sample and each reagent are in stable environment, thus obtaining more real test knot
Really.
Further, refer to Fig. 1, in the present embodiment, also include a display screen 7, display screen 7 is electrically connected to system control
Terminal 4 processed and outside cabinet 1.Realize data result using display screen 7, more intuitively.
Specifically, refer to Fig. 1 to Fig. 5, when test object is for water, select other reagent to have：Chromogenic reaction agent iodate
The mixture of mercury and KI, cleaning agent are distilled water, and the ammonia-nitrogen content testing procedure of water sample is as follows：
First, sample water is measured and transmits to reaction unit 2,；
Second, clean part flow arrangement 32 and metering device 33 using distilled water, and waste liquid will be cleaned by metering device 33
It is expelled to outside；
3rd, mercuric iodixde and KI mixture are measured and transmits to reaction unit 2, after static 10～15 minutes,
The wavelength of detection reactant liquor, obtains the absorbance of sample water；
4th, clean part flow arrangement 32 and metering device 33 using distilled water, and waste liquid will be cleaned by metering device 33
It is expelled to outside；
5th, sample water is changed into no ammoniacal liquor repeat the above steps, obtains the absorbance of control experiment no ammoniacal liquor；
6th, by measuring difference twice, calculate the absorbance of sample water, waste reaction solution is expelled to by reaction unit 2
Outside；
7th, the conversion of this absorbance is become actual ammonia-nitrogen content by system control terminal 4 again.
During above-mentioned steps, all part flow arrangement 32 and metering device 33 are carried out in each metering gaps, it is to avoid
Mutually pollute between reagent or between sample water and each reagent and between reagent and reagent, thus providing the essence of testing result
Really property, and obtain the stability of the testing result of increase.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. ammonia nitrogen on-line computing model, including cabinet it is characterised in that also including reaction unit, transfusion system in described cabinet
System and system control terminal：
, there is chromogenic reaction for sample with reagent, to obtain the absorbance of sample in described reaction unit；
Described transfusion system, is communicated in described reaction unit, sample and each reagent are measured in batches and by metering order according to
Secondary transmit to described reaction unit；
Described system control terminal, is electrically connected to described reaction unit, and described absorbance is scaled actual ammonia-nitrogen content, institute
The system control terminal of stating is electrically connected to described transfusion system to control described transfusion system automatic transport liquid to be detected, often to
After described reaction unit completes once to infuse, described system control terminal controls described transfusion system to all transfusions in instrument
Passage carries out one or many cleaning.
2. ammonia nitrogen on-line computing model as claimed in claim 1 is it is characterised in that described transfusion system is included to sample and each
Reagent provides the drive mechanism of transmission power, part flow arrangement and metering device for shunting sample and each reagent, described system
System control terminal is electrically connected to described driving structure and described part flow arrangement, and described metering device all connects with described reaction unit
In described part flow arrangement, after sample and each reagent sequentially pass through described part flow arrangement shunting, enter described metering device and carry out
Metering, after the completion of metering, sample and each reagent return described part flow arrangement and are shown with finally converging in described reaction unit
Colour response, after often completing once to infuse to described reaction unit, described system control terminal controls described drive mechanism and described
Part flow arrangement carries out one or many cleaning to all infusion channel in instrument.
3. ammonia nitrogen on-line computing model as claimed in claim 2 it is characterised in that described part flow arrangement be a multiple-way valve group, institute
Wherein one valve port stating multiple-way valve group is communicated in described metering device by a conduit, and another valve port of described multiple-way valve group passes through
One conduit is communicated in described reaction unit, other valve ports of described multiple-way valve group be respectively communicated with sample by some conduits and
Each reagent.
4. ammonia nitrogen on-line computing model as claimed in claim 2 it is characterised in that described part flow arrangement be a multi-joint magnetic valve,
One end of described multi-joint magnetic valve is communicated in sample, each reagent and cleaning agent by some conduits, and described multi-joint magnetic valve is another
One end is communicated in described metering device by a conduit, and the 3rd end of described multi-joint magnetic valve is communicated in described anti-by a conduit
Answer device.
5. ammonia nitrogen on-line computing model as claimed in claim 2 is it is characterised in that described metering device includes gauge line and many
The individual light metering unit for detecting sample or reagent liquid level in described gauge line, each described light metering unit is along described meter
The axial direction of buret is sequentially arranged on the side wall of described gauge line, and described gauge line is communicated in described part flow arrangement, each described
Light metering unit is electrically connected to described drive mechanism.
6. the ammonia nitrogen on-line computing model as described in claim 1 to 5 any one is it is characterised in that described reaction unit includes
Housing, located at the reaction tank in described housing and for detecting the detection means of reactant liquor absorbance in described reaction tank, institute
State detection means in described housing.
7. the ammonia nitrogen on-line computing model as described in claim 1 to 5 any one stops liquid valve, institute it is characterised in that also including one
State only liquid valve one end and be communicated in described reaction unit, the other end of described only liquid valve is communicated in described metering device.
8. the ammonia nitrogen on-line computing model as described in claim 1 to 5 any one is it is characterised in that also include the first installing plate
With the second installing plate, described first installing plate is vertically erected on the bottom of described cabinet, and described cabinet inner chamber is separated into
Cup and rear chamber, described reaction unit and described transfusion system are located in described cup and are fixedly connected on installing plate, described
Second installing plate is horizontally placed on the top ends of described first installing plate, and described system control terminal is located at described second installing plate
On.
9. ammonia nitrogen on-line computing model as claimed in claim 8 is it is characterised in that also include some kits, each described reagent
Box is in described cup.
10. the ammonia nitrogen on-line computing model as described in claim 1 to 5 any one is it is characterised in that also include a display screen,
Described display screen is electrically connected to described system control terminal and outside described cabinet.
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| CN201610725503.4A CN106442487A (en) | 2016-08-25 | 2016-08-25 | Online ammonia nitrogen monitor |
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| CN107064127A (en) * | 2017-04-21 | 2017-08-18 | 苏州源泓环保科技有限公司 | Ammonia nitrogen water quality online test method |
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| CN109283137A (en) * | 2018-09-30 | 2019-01-29 | 宁波万泽微测环境科技股份有限公司 | A kind of ammonia nitrogen in-line analyzer |
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