CN106442089A - Low concentration ammonia nitrogen detection method and device of concentrated ammonia nitrogen - Google Patents
Low concentration ammonia nitrogen detection method and device of concentrated ammonia nitrogen Download PDFInfo
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- CN106442089A CN106442089A CN201610824053.4A CN201610824053A CN106442089A CN 106442089 A CN106442089 A CN 106442089A CN 201610824053 A CN201610824053 A CN 201610824053A CN 106442089 A CN106442089 A CN 106442089A
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- reagent bottle
- tube
- water sample
- reagent
- solenoid valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention discloses a low concentration ammonia nitrogen detection method and a device of concentrated ammonia nitrogen, and belongs to the field of water quality detecting. The device comprises an intermediate bulkhead and the intermediate bulkhead divides a box body into an upper tier and a lower tier, wherein the upper tier comprises an injection pump, a multi-way solenoid valve, a signal processing and controlling unit and a U-shape tube, a U-shape opening of the U-shape tube faces upwards, a forward permeable membrane is arranged in the middle position of the bottom of the pipeline of the U-shape tube, a spectral confocal displacement sensor is fixedly arranged above a left tube opening of the U-shape tube, a black box is fixed on the intermediate bulkhead and is arranged below the U-shape tube, an LED illuminant and a silicon photocell are arranged the left side wall and the left side wall of the black box in a face-to-face mode; the lower tier is provided with seven reagent bottles including a reagent bottle for water sampling ready to be detected, a reagent bottle for a masking agent, a reagent bottle for a nessler reagent, a reagent bottle for driving liquid, a reagent bottle for cleanser, a reagent bottle for liquid waste, a reagent bottle for a recycled driving liquid. The method comprises the steps of firstly adopting a forward permeable method to conduct concentration on a low concentration ammonia nitrogen water sample ready to be detected, then adopting a spectrophotometric method through the nessler reagent to conduct detection on the sample, so that low concentration ammonia nitrogen value can be precisely detected.
Description
Technical field
The present invention relates to just permeating and field of water quality detection, specifically a kind of low-concentration ammonia-nitrogen detection skill concentrating ammonia nitrogen
Art, can effectively concentrate the ammonia nitrogen in water sample to be measured, realize concentration is carried out quickly in the low-concentration ammonia-nitrogen of 3.00 below mg/L
Detect exactly.
Background technology
The ammonia-nitrogen content of water body refers to free state NH3With ammonium ion NH4 +The nitrogen that form exists, is reflection Water quality
One important indicator.The ammonia nitrogen of free state to a certain extent when can produce larger harm, as COD, ammonia nitrogen is also water body
In main oxygen consumption pollutant, the dissolved oxygen in ammonium oxidation decomposition and consumption water, make water body black smelly.Nonionic in ammonia nitrogen
Ammonia is the Main Factors causing aquatile to poison, and has larger murder by poisoning to aquatile.In the case of oxygen abundance, ammonia nitrogen
Can be nitrite nitrogen by microbiological oxidation, and then be decomposed into nitrate nitrogen, nitrite nitrogen is combined generation nitrous with protein
Amine, has carcinogenic and teratogenesis to human body.Due to the harm of ammonia nitrogen, all ammonia-nitrogen content is made that clearly in life and production
Regulation, for example, water quality standard for fishery regulation ammonia nitrogen concentration should be less than 0.2mg/L, when ammonia-nitrogen content is more than 2.00mg/L, Fish meeting
Ammonia nitrogen poisoning symptom occurs.In addition, drinking water standard is also made that relevant regulations to ammonia nitrogen concentration, standard regulation ammonia nitrogen limit value is
0.5mg/L.
Typically using ammonia nitrogen concentration instrument, ammonia nitrogen in water is detected in life and production, ammonia nitrogen concentration instrument is mainly by colorimetric
Ware, LED light source, silicon cell and signal processor etc. form, and it utilizes ammonia nitrogen and nessler reagent to react generation yellowish-brown complexation
The principle that the shade of thing is directly proportional to ammonia-nitrogen content to detect ammonia nitrogen concentration.Nessler reagent can be joined by two methods
Put：The first, mercuric chloride, potassium iodide and potassium hydroxide solution configuration；Second, potassium iodide, mercuric iodixde and sodium hydroxide are molten
Liquid configures.The brown complex that ammonia nitrogen is generated with nessler reagent has Absorption to the light of wavelength 420nm, by silicon cell
Absorbance can be recorded, absorbance is proportional with ammonia nitrogen concentration.But ammonia nitrogen concentration instrument has some shortcomings and shortcoming：First, instrument is grasped
Make complicated, reagent is poisonous, need specialty protection；Second, add from nessler reagent every time and be difficult to be consistent to detection time, because
This leads to the sampling time point cannot be precisely consistent；3rd, higher for ammonia nitrogen in high density detection accuracy, repeatability, but right
Larger, the poor repeatability in low-concentration ammonia-nitrogen detection error.
Content of the invention
The purpose of the present invention is for concentration in the low-concentration ammonia-nitrogen water sample detection accuracy of 3.00 below mg/L and accurately
Spend not high problem, a kind of low-concentration ammonia-nitrogen detection method concentrating ammonia nitrogen and device are provided, concentrated using positive infiltration technology and treat
Survey water sample so as to middle ammonia nitrogen concentration value improves, improve the accuracy of low-concentration ammonia-nitrogen detection.
The present invention a kind of concentrate ammonia nitrogen low-concentration ammonia-nitrogen detection means using technical scheme be：There is a casing, in
Casing is divided into upper and lower two-layer by space bar, and upper strata is provided with syringe pump, various way solenoid valve, signal processing and control unit and U-shaped
Pipe, various way solenoid valve is connected with the top port of various way solenoid valve in the underface of syringe pump, syringe pump, the U-shaped opening of U-tube
Upward, two U-tube mouths are respectively connecting to the different port of various way solenoid valve, and the duct bottom centre position of U-tube is equipped with just
Permeable membrane, U-tube is divided into left and right two parts, is fixed with Spectral Confocal displacement transducer above the left side mouth of pipe of U-tube；In
Black box below U-tube is fixed with space bar, the left and right sides inwall of black box arranges LED light source and silicon Face to face
Light cell, two inlet openings are arranged at black box top, and an inlet opening connects various way solenoid valve, and another inlet opening passes through hose connection
The outage of U-tube left bottom, arranges single-pass electromagnetic valve A on flexible pipe；There are water sample reagent bottle to be measured, screening agent examination in lower floor
Agent bottle, nessler reagent reagent bottle, drive liquid reagent bottle, cleaning agent reagent bottle, waste liquid reagent bottle, drive liquid reclaim reagent bottle this 7
Individual reagent bottle, wherein waste liquid reagent bottle connect to the outage of black box bottom, equipped with single-pass electromagnetic valve C in connecting tube；Drive
Hydrodynamic reclaim reagent bottle is respectively connecting to the outage of U-tube bottom right side, equipped with single-pass electromagnetic valve B in connecting tube, remaining
Five reagent bottle connect the different port of various way solenoid valve respectively；Signal processing is injected by wire respectively with control unit
Pump, various way solenoid valve, Spectral Confocal displacement transducer, LED light source, silicon cell and each single-pass electromagnetic valve.
The present invention a kind of concentrate ammonia nitrogen low-concentration ammonia-nitrogen detection means detection method adopt technical scheme be including with
Lower step：
1）Water sample to be measured is loaded in water sample reagent bottle, signal processing controls syringe pump and various way solenoid valve with control unit, from
Inject water sample to be measured on the left of U-tube in water sample reagent bottle to be measured, open Spectral Confocal displacement transducer, record initially water to be measured
Sample height height valueH 1 And input signal is processed and control unit；
2）Signal processing and control unit control syringe pump and switching various way solenoid valve, right to U-tube liquid reagent bottle from driving
Side drives liquid, and on the right side of the water of the left side water sample to be measured of U-tube reaches through forward osmosis membrane, left side water sample to be measured is concentrated, by light
Compose confocal displacement transducer and record water sample height value after concentrationH 2 And input signal is processed and control unit, calculate concentration ratio, close stance Spectral Confocal displacement transducer；
3）Signal processing and control unit control single-pass electromagnetic valve A to open, and the water sample after concentration flows downwardly into black box from U-tube
In, control syringe pump and switching various way solenoid valve simultaneously, inject screening agent from screening agent reagent bottle in black box；
4）Signal processing and control unit control syringe pump and switching various way solenoid valve, from nessler reagent reagent bottle in black box
Add nessler reagent, after question response is complete, read silicon cell analog signalses value, water sample concentration value after being concentratedC 1 , meter
Calculate the concentration value obtaining former water sample to be measured.
The present invention, compared with existing methods and techniques, has the advantage that：
1st, first to low-concentration ammonia-nitrogen, water sample to be measured takes positive osmosis to concentrate to the present invention, then recycles nessler reagent light splitting light
Degree method detects, can relatively accurately detect low concentration ammonia values of nitrogen might, repeatability is higher, and credibility is larger.
2nd, the liquid level before and after the present invention adopts Spectral Confocal displacement transducer detection water sample to be measured to concentrate, using secondary color
Light is the sensor of light source, and certainty of measurement can reach micron order, and light source is coaxial configuration with receiving light microscopic, is prevented effectively from light path
Block so that sensor probe diameter is less, be suitable for the less pipeline of diameter of the present invention.Because U-shaped pipe diameter size is solid
Fixed, each water sample ensures that water sample liquid level to be measured does not drop to curved areas when concentrating, therefore, before concentration ratio can be by concentrating
Height ratio conversion, converses the ammonia nitrogen concentration of former water sample to be measured in conjunction with the ammonia nitrogen concentration value detecting water sample after concentration afterwards
Value.
3rd, the positive infiltration technology in the present invention, with respect to pressure-actuated membrane separating process such as microfiltration, ultrafiltration and reverse osmosiss
Technology, has the advantages that many uniquenesses from process nature, if spontaneous carried out, can achieve without impressed pressure.These are excellent
Point achieves the concentration of water sample to be measured, instrument and equipment that again need not be complicated, for detection low concentration ammonia values of nitrogen might provide a novelty,
Quick and accurate method.
4th, the driving liquid that the positive osmosis of the present invention use can be NaCl solution etc., and NaCl solution is nontoxic, can use
Traditional desalting technology concentration and recovery and less scaling.Driving liquid after using individually is reclaimed, profit after concentrating, can be repeated
With meanwhile, it also avoid the mutual pollution between waste liquid after ammonia nitrogen detects.
5th, ammonia nitrogen of the present invention detection is carried out in black box, it is to avoid extraneous light interference, simultaneously as whole detection side
Method is all processor self-timing timing, is compared to human users and has more exact correspondence, improves low-concentration ammonia-nitrogen
The repeatability of detection and credibility.
Brief description
A kind of overall structure diagram of the low-concentration ammonia-nitrogen detection means concentrating ammonia nitrogen of Fig. 1 present invention；
Fig. 2 is the enriching service principle schematic of U-tube in Fig. 1；
Fig. 3 is black box sectional structure enlarged drawing in Fig. 1；
Fig. 4 is the control principle block diagram of Fig. 1 shown device；
Fig. 5 is the detection method flow chart of Fig. 1 shown device.
The sequence number of each part and title in accompanying drawing：1. casing；2. syringe pump；3. signal processing and control unit；4. screw；
5. various way solenoid valve；6.LCD display screen；7. key-press module；8. Spectral Confocal displacement transducer；9.U type pipe；10. semicircle solid
Determine ring；11. forward osmosis membranes；12. single-pass electromagnetic valve A；13. single-pass electromagnetic valve B；14. black boxes；15. single-pass electromagnetic valve C；16. treat
Survey water sample reagent bottle；17. screening agent reagent bottle；18. nessler reagent reagent bottle；19. driving liquid reagent bottle；20. cleaning agent reagent
Bottle；21. waste liquid reagent bottle；22. driving liquid reclaim reagent bottles；23.U type bank of tubes fluid apertures A；24.U type bank of tubes fluid apertures B；25. black boxes
Inlet opening A；26. black box inlet opening B；27. light transmission piece A；28.LED light source；29. light transmission piece B；30. silicon cells；31. black box rows
Fluid apertures；32. rear boards；33. central dividing plates.
Specific embodiment
Referring to Fig. 1 and Fig. 2, a kind of concrete casing 1 of low-concentration ammonia-nitrogen detection means concentrating ammonia nitrogen of the present invention, casing
1 is divided into upper and lower two-layer by the central dividing plate 33 of level, and upper strata only has one piece of rear board 32, has put 7 reagent bottle in lower floor.
Fixed installation syringe pump 2, various way solenoid valve 5, signal processing and control unit 3 and U-tube 9 on rear board 32,
It is fixing that signal processing and control unit 3 pass through screw 4.
The hollow black box of cuboid 14 is fixed with central dividing plate 33, is used for carrying out ammonia nitrogen detection.Black box 14 left side top
Have hose connection to various way solenoid valve 5, various way solenoid valve 5 connects signal processing and control unit 3 by control line.In addition, it is black
Case 14 crown center has the hose connection outage A23 to U-tube 9 left bottom, flexible pipe has single-pass electromagnetic valve A12 control soft
Pipe, single-pass electromagnetic valve A12 is connected to signal processing and control unit 3 by wire.
The underface of syringe pump 2 equipped with various way solenoid valve 5, the top port phase of the syringe of syringe pump 2 and various way solenoid valve 5
Even.Syringe pump 2 and various way solenoid valve 5 connect signal processing and control unit 3 by wire respectively.Semicircle fixing using two
U-tube 9 is vertically fixed on rear board 32 ring 10, U-tube 9 opening up, two U-tube mouths upward have flexible pipe respectively
Connect to the different port of various way solenoid valve 5.The duct bottom centre position of U-tube 9 is provided with forward osmosis membrane 11, forward osmosis membrane
U-tube 9 is divided into left and right two parts by 11, and left side is water sample pipe to be measured, and right side is to drive liquid pipe.On the left side mouth of pipe of U-tube 9
Side is fixed with Spectral Confocal displacement transducer 8, and Spectral Confocal displacement transducer 8 is connected to signal processing and control by top conductor line
Unit 3 processed.U-tube 9 is located above black box 14, and the minimum point of various way solenoid valve 5 is higher than the peak of U-tube 9, so, can profit
With action of gravity, liquid is smoothly flowed in U-tube 9 or black box 14.
7 reagent bottle are respectively water sample reagent bottle 16 to be measured, screening agent reagent bottle 17, nessler reagent reagent bottle from left to right
18th, drive liquid reagent bottle 19, cleaning agent reagent bottle 20, waste liquid reagent bottle 21, drive liquid reclaim reagent bottle 22.Screening agent reagent bottle
Fill screening agent in 17, screening agent is potassium sodium tartrate solution, there is the effect removing metal ion disturbance in water sample to be measured；Receive
Nessler reagent is filled, nessler reagent is by mercuric chloride, potassium iodide and potassium hydroxide solution or iodine in family name's reagent kit bottle 18
Change potassium, mercuric iodixde and sodium hydroxide solution configuration, nessler reagent and ammonia nitrogen react generation yellowish-brown complex shade and
The principle that ammonia-nitrogen content is directly proportional is detecting ammonia nitrogen concentration；Drive in liquid reagent bottle 19 and fill driving liquid, drive liquid to be that NaCl is molten
Liquid, drives liquid to form osmotic pressure with water sample to be measured, the water in water sample to be measured can be run off by forward osmosis membrane, reaches and concentrate water to be measured
Sample purpose.
Five reagent bottle in left side：Water sample reagent bottle 16 to be measured, screening agent reagent bottle 17, nessler reagent reagent bottle 18, driving
Liquid reagent bottle 19 and cleaning agent reagent bottle 20, pass through the hose connection different corresponding end to various way solenoid valve 5 in bottle respectively
Mouthful.Five flexible pipes circular hole from central dividing plate 33 is upward through, and enters upper strata.When five flexible pipes road altogether, will using adhesive tape
Five flexible pipes bundle.In addition, in order to make full use of the liquid in reagent bottle, in bottle, flexible pipe port is placed into reagent as far as possible
Bottom of bottle.The waste liquid reagent bottle 21 on right side passes through the hose connection outage 31 to black box 14 bottom, installs single-pass on flexible pipe
Electromagnetic valve C15, single-pass electromagnetic valve C15 connect signal processing and control unit 3.Liquid reclaim reagent bottle 22 is driven to pass through flexible pipe respectively
Connect to the outage B24 of U-tube bottom right side, single-pass electromagnetic valve B13 is installed on flexible pipe, single-pass electromagnetic valve B13 passes through to lead
Line connects signal processing and control unit 3.
It is fixed with LCD display 6 and key-press module 7 also by screw, both pass through respectively on plate 32 upper right corner below
Wire is connected to signal processing and control unit 3.
At least nine ports of various way solenoid valve 5, the left side in the hose connection lower floor in casing 1 is passed through in wherein five ports
Five reagent bottle, a top port is connected to the syringe of syringe pump 2, remaining three ports pass through respectively hose connection in U-shaped
Two of pipe 9 are towards the inlet opening of upper orifice and black box 14 left side top.
Referring to Fig. 2, it is water sample pipe to be measured in the left side pipeline of U-tube 9, be to drive liquid pipe in the pipeline of right side.On the left of U-tube
Bottom has outage A23, and U-tube bottom right side has outage B24.The water of left side water sample to be measured under osmotic pressure effect from
Send out ground and reach low water chemistry gesture region from high water chemistry gesture region through forward osmosis membrane 11, be i.e. the driving liquid pipe on U-tube 9 right side,
In water sample to be measured, eliminating water is all retained down.Extend with positive osmosis system run time, water sample to be measured is gradually concentrated, simultaneously
The driving liquid of high concentration is gradually diluted.The fundamental equation just permeating mass transfer is as follows：
（1）
In formulaJ w For water flux,AIt is the water permeability coefficient of forward osmosis membrane 11,∆πIt is the osmotic pressure of film both sides.Can by formula
Know, the water flux just permeating operation should the permeable pressure head between water sample to be measured and driving liquid be directly proportional in theory.But it is actual
Middle water flux will be much smaller than theoretical value.Therefore, before and after water sample to be measured being detected using Spectral Confocal displacement transducer 8 in the present invention
Liquid level, calculates actual concentration ratio K.Spectral Confocal displacement transducer 8 adopts the sensor that polychromatic light is light source, measurement
Precision can reach micron order, and light source is coaxial configuration with receiving light microscopic, is prevented effectively from light path and blocks so that sensor probe is straight
Footpath is less, is suitable for the less pipeline of diameter of the present invention.Because U-tube 9 road pipe diameter size is fixed, ensure when each water sample concentrates
Water sample liquid level to be measured does not drop to curved areas.Therefore, concentration ratio K by concentration anterior and posterior height ratiometric conversion, then can tie
The ammonia nitrogen concentration value closing water sample after ammonia nitrogen detector unit detects concentration converses the ammonia nitrogen concentration value of former water sample to be measured.Cocnentration factor
Example K computational methods are as follows：
（2）
WhereinRFor the radius of U-tube 9 vertical cylinder,H 1 For water sample liquid level elemental height to be measured,H 2 After concentrating for water sample to be measured
Liquid level.
Referring to Fig. 3, black box 14 is containment housing, and when can prevent from detecting, the interference of extraneous light, improves accuracy of detection.Black
Two inlet openings are arranged at case 14 top, and left side top is inlet opening B26, and right hand top is inlet opening A25, and inlet opening B26 passes through soft
Pipe connects various way solenoid valve 5, and inlet opening A25 connects the outage A23 of U-tube 9 left bottom.There is a row in black box 14 bottom
Fluid apertures 31, outage 31 is by hose connection to waste liquid reagent bottle 21.Cloth Face to face on the left and right sides inwall of black box 14
Put one piece of square light transmission piece A27, B29, light transmission piece A27, B29 marine glue sticks at the internal left and right sides of black box, light transmission piece surface
Coplanar with black box 14 inner surface.It is embedded with LED light source 28 in black box 14 left side wall, LED light source 28 is on the left of light transmission piece A27；
Be embedded with silicon cell 30 in black box 14 right side wall, silicon cell 30 on the right side of light transmission piece B29, LED light source 28 and silicon cell 30
Left and right is arranged face-to-face, and LED light source 28 and silicon cell 30 connect signal processing and control unit 3 by wire respectively.LED light
The light that source 28 sends fixed wave length is absorbed by silicon cell 30 by reacted solution.Signal processing is read with control unit 3
Silicon cell 30 analog signalses value, is compared with default standard value, obtains water sample concentration value after concentratingC 1 , and by dense
Contracting ratioKCalculate the concentration value obtaining former water sample to be measuredC：
（3）
Referring to Fig. 4, signal processing and control unit 3 include MCU controller, power module, linear stepping motor drive circuit, perseverance
Current source circuit and analog to digital conversion circuit.With MCU controller as core, power module provides electricity for whole device to whole control process
Power.MCU controller passes through to send, to linear stepping motor drive circuit, the linear stepping motor operating that order drives syringe pump 2,
Then needle cylinder does the interpolation work that piston movement completes liquid to linear stepping motor.Spectral Confocal displacement transducer 8 is then direct
It is connected with MCU controller, MCU controller reads the level galge before and after Spectral Confocal displacement transducer 8 water sample to be measured concentrates
Calculate and obtain concentration ratio.Various way solenoid valve 5, single-pass electromagnetic valve A12, single-pass electromagnetic valve B13, single-pass electromagnetic valve C15 and MCU control
Device is connected, and controls their working conditions by MCU controller.Key-press module 7 is also connected with MCU controller, can pass through button mould
The operation of block 7 manual overvide.MCU controller passes through to transmit the information of required display to LCD display 6, convenient reading ammonia
The information such as nitrogen concentration value.MCU controller is connected with constant-current source circuit, controls constant-current source circuit operating, and constant-current source circuit drives LED
Light source 28.Silicon cell 30 then detects absorbance, converts analog signals into digital data transmission extremely by analog to digital conversion circuit
MCU controller calculates and obtains ammonia nitrogen concentration value.Whole device is transported by the program setting with control unit 3 in an orderly manner in signal processing
Turn, need not overstaffed operate.
Referring to Fig. 5, a kind of detection method of the low-concentration ammonia-nitrogen detection means concentrating ammonia nitrogen of the present invention is specific as follows：
Water sample to be measured is loaded in water sample reagent bottle 16, and puts into correspondence position, water sample reagent bottle 16 to be measured put into by corresponding flexible pipe
In.Signal processing and control unit 3 control syringe pump 2 and switching various way solenoid valve 5, to U-shaped from water sample reagent bottle 16 to be measured
Pipe 9 left side injected slurry volume is V1Water sample to be measured.
Signal processing and control unit 3 control Spectral Confocal displacement transducer 8 to open, and recording initially water sample height to be measured isH 1 , and by height valueH 1 Input signal is processed and control unit 3, closes Spectral Confocal displacement transducer 8.
Signal processing and control unit 3 control syringe pump 2 and switching various way solenoid valve 5, to U from driving liquid reagent bottle 19
Type pipe 9 right side injected slurry volume is V2Driving liquid.The water of the left side water sample to be measured of U-tube 9 arrives in the presence of forward osmosis membrane 11
Reach right side, in water sample to be measured, eliminating water is all retained down, and water sample to be measured is gradually concentrated, simultaneously right side high concentration driving liquid by
Gradually it is diluted, wait t1After time, former water sample to be measured is concentrated, and is again turned on Spectral Confocal displacement transducer 8, after recording concentration
Water sample height isH 2 , and by height valueH 2 Input signal is processed and control unit 3, close stance Spectral Confocal displacement transducer 8.
Signal processing and control unit 3 calculate concentration ratio.
Signal processing and control unit 3 control single-pass electromagnetic valve A12 to open so that the water sample after concentrating is downward from U-tube 9
Flow in black box 14.Wait t2After time, to be concentrated after water sample all flow in black box 14 after, signal processing and control unit
3 control LED light sources 28 and silicon cell 30 carry out school zero, control syringe pump 2 and switching various way solenoid valve 5, from screening agent simultaneously
In reagent bottle 17 to injected slurry volume in black box 14 be V3Screening agent.
Wait t3After time, control syringe pump 2 and switching various way solenoid valve 5, to black box from nessler reagent reagent bottle 18
Volume is added to be V in 144Nessler reagent.Wait T time, after question response is complete, read silicon cell 30 analog signalses, with
Signal processing is compared with standard value set in advance in control unit 3.If exceeding detection range, pass through LCD display 6
Display over range, otherwise compares water sample concentration value after being concentratedC 1 , and pass through concentration ratioKCalculate and obtain former water sample to be measured
Concentration value, then it is shown without the ammonia nitrogen concentration value of over range by LCD display 6.
Open single-pass electromagnetic valve B13, the driving liquid in U-tube 9 right side pipe is entered in driving liquid reclaim reagent bottle 22；With
When open single-pass electromagnetic valve C15, waste liquid in black box 14 is entered in waste liquid reagent bottle 21.
After waiting liquid drained, control syringe pump 2 and various way solenoid valve 5 from cleaning agent reagent bottle 20 extract cleaning agent to
U-tube 9 left side pipeline injection, cleaning U-tube 9 left side pipe and black box 14.After the completion of cleaning, close single-pass electromagnetic valve B13 and list
Three-way electromagnetic valve C15 waits detection next time.
Claims (8)
1. a kind of low-concentration ammonia-nitrogen detection means concentrating ammonia nitrogen, has a casing（1）, central dividing plate（33）By casing（1）
It is divided into upper and lower two-layer, it is characterized in that：Upper strata is provided with syringe pump（2）, various way solenoid valve（5）, signal processing and control unit（3）With
And U-tube（9）, various way solenoid valve（5）In syringe pump（2）Underface, syringe pump（2）With various way solenoid valve（5）Top end
Mouth is connected, U-tube（9）U-shaped opening upward, two U-tube mouths are respectively connecting to various way solenoid valve（5）Different port, U-shaped
Pipe（9）Duct bottom centre position equipped with forward osmosis membrane（11）, by U-tube（9）It is divided into left and right two parts, U-tube（9）A left side
It is fixed with Spectral Confocal displacement transducer above side pipe mouth（8）；Central dividing plate（33）On be fixed with positioned at U-tube（9）Lower section
Black box（14）, black box（14）Left and right sides inwall on arrange LED light source Face to face（28）And silicon cell（30）, black box
（14）Two inlet openings are arranged at top, and an inlet opening connects various way solenoid valve（5）, another inlet opening passes through hose connection U-shaped
Pipe（9）The outage A of left bottom（23）, single-pass electromagnetic valve A is arranged on flexible pipe（12）；There is water sample reagent bottle to be measured in lower floor
（16）, screening agent reagent bottle（17）, nessler reagent reagent bottle（18）, drive liquid reagent bottle（19）, cleaning agent reagent bottle（20）, useless
Liquid reagent bottle（21）, drive liquid reclaim reagent bottle（22）This 7 reagent bottle, wherein waste liquid reagent bottle（21）Connect to black box
（14）The outage of bottom（31）, equipped with single-pass electromagnetic valve C in connecting tube（15）；Drive liquid reclaim reagent bottle（22）Connect respectively
It is connected to U-tube（9）The outage B of bottom right side（24）, equipped with single-pass electromagnetic valve B in connecting tube（13）, remaining five examinations
Agent bottle connects various way solenoid valve respectively（5）Different port；Signal processing and control unit（3）By wire syringe pump respectively
（2）, various way solenoid valve（5）, Spectral Confocal displacement transducer（8）, LED light source（28）, silicon cell（30）And each single-pass
Electromagnetic valve.
2. low-concentration ammonia-nitrogen detection means according to claim 1, is characterized in that：Screening agent reagent bottle（17）In fill wine
Stone acid potassium sodium solution screening agent, nessler reagent reagent bottle（18）In fill nessler reagent, nessler reagent is by mercuric chloride, iodate
Potassium and potassium hydroxide solution or potassium iodide, mercuric iodixde and sodium hydroxide solution configuration, nessler reagent and ammonia nitrogen react generation
The shade of yellowish-brown complex is directly proportional to ammonia-nitrogen content, drives liquid reagent bottle（19）In fill NaCl solution drive liquid.
3. low-concentration ammonia-nitrogen detection means according to claim 1, is characterized in that：Upper strata is additionally provided with LCD display（6）With
Key-press module（7）, both are connected to signal processing and control unit by wire respectively（3）.
4. low-concentration ammonia-nitrogen detection means according to claim 1, is characterized in that：Various way solenoid valve（5）Minimum point high
In U-tube（9）Peak.
5. a kind of detection method of low-concentration ammonia-nitrogen detection means as claimed in claim 1, is characterized in that comprising the following steps：
1）Water sample to be measured is loaded water sample reagent bottle（16）In, signal processing and control unit（3）Control syringe pump（2）With many
Three-way electromagnetic valve（5）, from water sample reagent bottle to be measured（16）Middle to U-tube（9）Water sample to be measured is injected in left side, opens Spectral Confocal displacement
Sensor（8）, record initially water sample height height value to be measuredH 1 And input signal is processed and control unit（3）；
2）Signal processing and control unit（3）Control syringe pump（2）With switching various way solenoid valve（5）, from driving liquid reagent bottle
（19）Middle to U-tube（9）Right side drives liquid, U-tube（9）Left side water sample to be measured water through forward osmosis membrane（11）On the right side of arrival,
Left side water sample to be measured is concentrated, by Spectral Confocal displacement transducer（8）Record water sample height value after concentrationH 2 And input signal
Process and control unit（3）, calculate concentration ratio, close stance Spectral Confocal displacement transducer（8）；
3）Signal processing and control unit（3）Control single-pass electromagnetic valve A（12）Open, the water sample after concentration is from U-tube（9）Downwards
Flow into black box（14）In, control syringe pump simultaneously（2）With switching various way solenoid valve（5）, from screening agent reagent bottle（17）Middle to black
Case（14）Middle injection screening agent；
4）Signal processing and control unit（3）Control syringe pump（2）With switching various way solenoid valve（5）, from nessler reagent reagent bottle
（18）Middle to black box（14）Middle addition nessler reagent, after question response is complete, reads silicon cell（30）Analog signalses value, obtains
Water sample concentration value after concentrationC 1 , calculate the concentration value obtaining former water sample to be measured.
6. detection method according to claim 5, is characterized in that：Step 4）In, silicon cell will be read（30）Analog quantity
Signal value and signal processing and control unit（3）In standard value set in advance be compared, if exceed detection range, pass through
LCD display shows over range, otherwise compares water sample concentration value after being concentratedC 1 .
7. detection method according to claim 6, is characterized in that：Open single-pass electromagnetic valve B（13）, by U-tube（9）Right side
Driving liquid in pipe enters driving liquid reclaim reagent bottle（22）In, open single-pass electromagnetic valve C simultaneously（15）, by black box（14）In useless
Abandon liquid and enter waste liquid reagent bottle（21）In.
8. detection method according to claim 7, is characterized in that：Control syringe pump（2）With various way solenoid valve（5）From cleaning
Agent reagent bottle（20）Extract cleaning agent to U-tube（9）Left side pipeline injection, cleans U-tube（9）Left side pipe and black box（14）.
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