CN110133071A - A kind of method that COD electrochemistry is quickly monitored on-line - Google Patents

A kind of method that COD electrochemistry is quickly monitored on-line Download PDF

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CN110133071A
CN110133071A CN201910321910.2A CN201910321910A CN110133071A CN 110133071 A CN110133071 A CN 110133071A CN 201910321910 A CN201910321910 A CN 201910321910A CN 110133071 A CN110133071 A CN 110133071A
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cod
electric current
working electrode
oxidation
electrochemistry
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CN110133071B (en
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万端极
周明喆
许慧
吕彦杰
杜晨宇
周峰博
谢逾群
刘德富
张子蓬
陈水胜
王超
张莹
黄梦萍
李祝
常锋毅
汪淑廉
梅洪
葛红梅
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Monet (Wuhan) Intelligent Technology Co.,Ltd.
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Hubei University of Technology
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    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/308—Electrodes, e.g. test electrodes; Half-cells at least partially made of carbon
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/50—Photovoltaic [PV] energy
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Abstract

The present invention relates to a kind of methods that COD electrochemistry is quickly monitored on-line, a kind of quick on-line computing model of COD electrochemistry is constructed first, it include: sample cell, working electrode, reference electrode, peristaltic pump, magnetic stirring apparatus, solar battery, solar energy electroplax, electric current converts COD chip, it is wirelessly transferred transmitting terminal, radio transceiver end, the working electrode is using nano modification silica as carrier, again using the waste containing more carbon in PETROLEUM PROCESSING as raw material, graphene is prepared using thermal-cracking method and it is modified, compound formed is carried out with silica nanometer modified material carrier afterwards；The organic matter complete oxidation in sewage is become into H by the OH hydroxyl radical free radical that electrochemical working electrode generates2O and CO2, current value is converted into COD numerical value by electric current conversion COD chip by oxidation current value, then passes through the circuit set for COD numerical value conversion into digital signal；Signal is carried out by mobile phone or the network platform and receives and implement control, realizes the long-range control of on-line computing model.

Description

A kind of method that COD electrochemistry is quickly monitored on-line
Technical field
The present invention relates to a kind of methods that COD electrochemistry is quickly monitored on-line, and in particular to is realized using electrochemical principle COD is fast and accurately monitored, and realizes wireless transmission.
Background technique
COD is important indicator for measuring degree of water pollution, and degree of water pollution is contained by organic matter in water body What amount determined.The organic matter in water body is completely oxidized to titanium dioxide using chemical method by content of organics in detection sewage Carbon CO2With water H2O, then calculate the oxygen demand in oxidation process, so that it may the COD numerical value of pollution level is obtained, biochemical oxygen demand is called Amount.Traditional method is that the larger molecular organics in sewage are first degraded into small molecule with strong acid such as sulfuric acid, then with excessive height Potassium manganate or potassium bichromate carry out complete oxidation to organic matter, then detect remaining potassium permanganate or potassium bichromate (is called titration Method) inverse goes out oxygen demand, or is measured with spectrophotometry and calculate oxygen demand.This method is the problem is that need to use Organic solvent, complex procedures, detection error are big, detection time is long (6 hours), it is sufficiently expensive to realize the equipment of on-line monitoring, tie up It protects costly.
(1) Coulomb equation COD of sewage on-line computing model
Such monitoring is to rely on the oxidation mechanisms of potassium permanganate or potassium bichromate to realize.Due to potassium permanganate MnO4- Oxidation-reduction potential it is low only 1.33V, potassium bichromate K2Cr2O7Oxidation-reduction potential also only have 1.67V.Such oxidation Ability can only aoxidize small organic molecule.First macromolecular substances must be made to be degraded into through the constant-temperature enclosed resolution of nitric acid oxidizable small Molecular substance, then plus excessive potassium bichromate or potassium permanganate be oxidant, catalyst, molybdenum propylhomoserin, aluminum aluminum sulfate are made with silver salt Make co-catalyst, complete oxidation is carried out to small organic molecule and is decomposed into H2O and CO2.It uses in iron ammonium sulfate Titration Water Sample again not The potassium bichromate or potassium permanganate being reduced are converted into the mass concentration of consumption oxygen by the amount of the iron ammonium sulfate consumed to calculate COD numerical value, using line transmission to control centre, the data precision that the method measures is higher.But equipment is sufficiently complex, therefore Barrier rate is high, especially daily will correction of timing probe (probe is oxidized easily) and quantitatively add different solvents, need It is equipped with the maintenance personnel of profession, while needing to consume a large amount of solvent and causing serious secondary pollution.220V electricity must be used Source, detection time 4-6 hours.The general one terminal device price without hop is on (import) 200,000 yuans of left sides The right side, domestic (ten thousand yuan of 5-8), ten thousand yuan of annual operating cost 5-10.
(2) spectrophotometry COD of sewage on-line computing model
The detected sample pre-treatments of the method and the pre-treatment of Coulomb equation are essentially the same, only can only be with dichromic acid Potassium K2Cr2O7 is oxidant.Be according to Cr VI the being reduced property substance Quantitative reduction in solution be trivalent chromium, use spectrophotometric The absorbance of meter measurement trivalent chromium, is quantitatively obtained COD numerical value by the linear relationship of absorbance and water sample COD, using Line transmission is to control centre.The data precision that the method measures is higher.But equipment is sufficiently complex, and failure rate is high, especially Be daily will correction of timing probe (probe is oxidized easily) and quantitatively add different solvents, need to be equipped with professional maintenance Personnel, while needing to consume a large amount of solvent and causing serious secondary pollution.220v power supply, detection and time must be used 4--6 hours.General one is free of 200,000 yuans or so of terminal device price (import) of hop, domestic (5-8 ten thousand Member), ten thousand yuan of annual operating cost 5-10.
(3) ozone oxidation COD on-line computing model
Ozone (O3) generated by the ozone generator of monitoring system special configuration.Due to ozone (O3) oxidation-reduction potential For 2.07V, oxidant can be gone out by the macromolecular substances complete oxidation in detected solution, then with two pairs of electrodes systematic survey (O3) consumption, then by the electricity of ozone-depleting, according to Faraday's law, water sample COD value can be calculated after calibrated.Example As German STIP-SICO company produces the online COD automatic tester of PHOENIX-1010, the BD9372 of Beijing the Big Dipper production Online quickly COD analyzer is exactly to design by this principle, is widely used in European and American countries and China.Instrument master Wanting feature is to utilize ozone (O3) oxidation-reduction potential be 2.07V the strong feature of oxidability, not to tested sample into The pre-treatment of row nitric acid high temperature, simplifies testing process, and measuring speed is fast, time of measuring: 30min or so, without secondary pollution.But Still 220v power supply is used, the accurate data especially detected and actual value error are larger, up to 1 or even several orders of magnitude More than, the reason is that ozone (O3) oxidation-reduction potential be 2.07V, oxidation-reduction potential cannot greater than the organic matter of 2.07V Complete oxidation is decomposed into H2O and CO2, only it is applicable in the less sewage system of larger molecular organics.And apparatus structure is still relatively more multiple Miscellaneous, Operation and Maintenance amount is big, high failure rate.General one is free of the terminal device price (import) of hop, 300,000 yuan of people Coin or so, the left and right domestic (ten thousand yuan of 8--10), ten thousand yuan of annual operating cost 5-10.Annual ten thousand yuan of operating cost 5-10 or so.
(4) brown lead oxide titanium-matrix electrode electrochemistry COD of sewage on-line computing model
Using the metal oxide brown lead oxide titanium-matrix electrode with strong catalytic performance, electrolysis, which generates, has Strong oxdiative ability OH hydroxyl radical free radical direct oxidation be detected solution in organic matter.It, can be thorough since oxidation-reduction potential is up to 2.8V Organic matter in the oxidation sample of bottom is simultaneously completely decomposed into H2O and CO2.It is obtained by the voltage of electrochemistry and the conversion relation of amount of oxidation To COD numerical value.This electrochemical workstation and Transmission system collection achievement are constituted into COD on-line computing model.Since electricity consumption is minimum, institute Not have to 220V power supply.Power supply in field only needs lesser solar energy board group to close solar battery realization.The system has Equipment very simple, detection data accuracy is high, detection monitoring time is short, only needs 30 minutes or so, and it is all that equipment failure rate is low etc. More advantages.But due to brown lead oxide titanium-matrix electrode easily aoxidized by OH hydroxyl radical free radical to be formed open structure cause detection tie Fruit deviation is big, needs to carry out regeneration to electrode daily or frequently replacement electrode just can guarantee the accuracy of testing result.German LAR is public It is equal to take charge of the ELOX100ACOD online automatic detection instrument released, the online COD detector of COD--580 type of Shanghai Lei Ci company release For brown lead oxide titanium-matrix electrode OH hydroxyl radical free radical detection pattern.General one is free of the terminal device price of hop 600,000 yuans or so of (import), left and right domestic (ten thousand yuan of 25-30), due to frequently replacing electrode, annual operating cost Ten thousand yuan of 20-30.
(5) diamond boryl electrode electro Chemical COD of sewage on-line computing model
Currently, the states such as America and Europe using powerful oxidation corrosion resistance diamond (diamond) mix boron technique study complete it is artificial Diamond boryl electrode electro Chemical COD of sewage on-line computing model.Because diamond is insulator, it is necessary to mix a large amount of energy The boron of powerful oxidation corrosion resistance realizes its electric conductivity.The electrode aoxidizes item in the OH hydroxyl radical free radical of up to 2.8V oxidation-reduction potential Good stability is shown under part.The detector is 10--30min according to the pollution level detection time of sewage, is really had Equipment is simple, detection data accuracy is high, electrode life is long and easy to operate, failure rate is extremely low, stable equipment operation, maintenance The plurality of advantages such as expense is low.But this electrode fabrication is sufficiently complex, and price is also sufficiently expensive.General one piece of small electrical pole plate is in 5- 80000 dollars or so.The general one terminal device price without hop is at ten thousand yuans of 100-200.Annual is basic There is no running cost.
(6) conclusion:
Currently, a large amount of monitoring point such as the rivers and lakes waters in China, industrial enterprise, urban sewage need it is simple and quick and Cheap COD on-line monitoring equipment, the COD detection in current laboratory all combines spectrophotometric or titration using resolution in addition Method, complicated for operation, detection time is long, it is also desirable to which a kind of quick detection method of low price substitutes traditional COD detection method.City Field demand is at 100,000,000 or more.If a kind of stable electricity of cheap strong oh resistant hydroxyl radical free radical oxidation can be prepared Pole, can develop it is a kind of truly it is cheap, stable, maintenance is simple, accuracy in detection is high, power supply is convenient COD fast detector (online), a kind of quick on-line monitoring system of urgent need or the detection device in laboratory are provided for market And method.
Summary of the invention
In order to overcome the shortcomings of the prior art described above, it is an object of the invention to prepare one kind using electrochemical principle The quick online monitoring instruments of COD electrochemistry and method, COD on-line monitoring method of the present invention are the OH hydroxyls generated using electrochemistry Base free radical, can be straight according to oxidation current value in a very short period of time by the organic matter complete oxidation in detected sewage Switch through and change chemical oxygen demand cod digital signal into, then through 2G or 4G system emit, using mobile phone or the network platform it is ready to receive and Control.
In order to achieve the above object, the technical scheme adopted by the invention is that:
A kind of method that COD electrochemistry is quickly monitored on-line, which comprises the steps of:
(1) a kind of quick on-line computing model of COD electrochemistry is constructed, comprising: sample cell, working electrode, reference electrode, wriggling Pump, magnetic stirring apparatus, solar battery, solar energy electroplax, electric current conversion COD chip, wireless transmission transmitting terminal, wireless transmission connect Receiving end, the working electrode is embedded in reference electrode to be prepared by insulating materials, volume be 50ml to 100ml sample cell in, The sample bottom of pond portion places the magnetic stir bar that length is less than 2cm, is placed on magnetic stirring apparatus, completes sample continuous mode In agitation task；The working electrode connection provides the solar battery of electric current, voltage value 2.5v, the day of solar battery Often charging is completed by solar energy electroplax；The sample cell injection port connects peristaltic pump by conduit, completes sample and monitors process on-line In sample introduction work；The working electrode output end connection electric current converts COD chip, completes electric current in working electrode continuous mode The calculating and measurement of consumption, electric current needed for electric current conversion COD chip is run are provided by the solar battery；It is converted by electric current The COD data that COD chip obtains carry out 4G wireless transmission by wireless transmission transmitting terminal, and are received by radio transceiver end To user computer, it is wirelessly transferred electric current needed for transmitting terminal provides operation by solar battery；The working electrode is changed using nanometer Property silica prepares stone using thermal-cracking method as carrier, then using the waste containing more carbon in PETROLEUM PROCESSING as raw material Black alkene is simultaneously modified it, carries out compound formed with silica nanometer modified material carrier afterwards；
(2) sewage is pumped into oxidation trough by peristaltic pump, the flow of peristaltic pump is 20mL/min；
(3) the organic matter complete oxidation in sewage is become by the OH hydroxyl radical free radical that electrochemical working electrode generates H2O and CO2, oxidization time 30min；It is 2.5V that electrode, which generates OH hydroxyl radical free radical voltage value, and current value is 15 μ A；Electrode Organic matter complete oxidation in sewage is H by generated OH hydroxyl radical free radical2O and CO2Range be 1--50000Mg/L；
(4) current value is converted into COD numerical value by electric current conversion COD chip by oxidation current value, passes through the complete oxygen of foundation The electric current of change process and the corresponding relationship of oxygen demand are converted into COD (chemical oxygen consumption (COC)) numerical value by current value；Oxidation current with Chemical oxygen consumption (COC) is a linear relationship, can establish electric signal and digital signal translative mode；
(5) pass through the circuit set for COD numerical value conversion into digital signal；
(6) by signal transmission system, COD digital signal transmission is gone out using 4G signal generator；
(7) it carries out signal reception by mobile phone or the network platform and implements to control, realize the long-range control of on-line computing model.
Further, the peristaltic pump is two-way pump.
Further, stop peristaltic pump to full signal is discharged by being provided with magnetic switch at the top of oxidation trough in step (2) Only work.
The solar battery and solar energy electroplax be designed to guarantee on-line computing model in the case where no light by 1 30min of monitoring is calculated daily, can be continuous work 192 hours.
The present invention is realized using graphene dioxide composite silicon nano material as working electrode using the method for electrochemistry COD is quickly monitored on-line, and innovative point and advance are specific as follows:
This COD electrochemistry on-line computing model has the following characteristics that compared with existing on-line computing model
(1) strong anti-oxidation electrode is prepared using the compound thermal cracking modified graphene of silica nanometer modified material.The electricity Pole as carrier and carries out nano modification as carrier using high inert material silica, then in PETROLEUM PROCESSING containing more carbon Waste is raw material, after preparing graphene using thermal-cracking method and being modified to it, with the modified material of silica nanometer It is compound to expect that carrier carries out, forms excellent conductivity and the working electrode with strong oxidation resistance.
(2) this COD electrochemistry on-line computing model detection time is short.5--30min is only needed, traditional detection time is 6 small When.
(3) non-maintaining.Traditional COD detector year maintenance cost needs ten thousand yuan of 10--30 of dimension according to equipment difference every year Shield expense.
(4) it is not necessarily to 220V alternating current.The solar energy used is just able to satisfy power supply, adapts to the reality of the on-line monitoring under the conditions of all It is existing.
(5) equipment price is low.Low this electrode Costco Wholesale is 3000 yuan or so, so, a COD electrochemistry on-line monitoring Instrument overall cost is 0.5 ten thousand yuan.30,000 yuan of market price, only the 1/6 of existing market same category of device lowest price.
(6) signal conversion and transmitting are easily accomplished.This COD electrochemistry on-line computing model is complete by OH hydroxyl radical free radical Oxidation current value is simultaneously directly changed into digital signal and is emitted by 2G by organic matter in oxidized sewage, and conversion is simple, is easy It realizes.
(7) accuracy in detection and zero degree are high.Due to being using OH hydroxyl radical free radical disposably by organic matter complete oxidation At carbon dioxide CO2With water H2O, then COD value is calculated by oxidation current.Compared to traditional first with sulfuric acid by big point in sewage Sub- organic matter degradation carries out chemical oxidation at small molecule, then by excessive potassium permanganate or potassium bichromate, then uses potassium permanganate Or potassium bichromate titrate or detected with spectrophotometer, then calculates COD value, complex procedures, error is big.This instrument Existing COD detector, such as COD Ozone Monitor and COD brown lead oxide Electrochemical Detection are compared in accuracy with high sensitivity Instrument is even higher by 1 order of magnitude.
(8) detection range is wide, and sample is without dilution.Existing COD detector is general only in 1000mg/L, is higher than Easily there is error using detecting again after dilution in 1000mg/L.This electrochemistry COD detector test range 1-50000mg/L.
Detailed description of the invention
Fig. 1 is circuit topological structure schematic diagram of the present invention.
Specific embodiment
For the ease of those of ordinary skill in the art understand and implement the present invention, below with reference to embodiment to the present invention make into The detailed description of one step, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, and is not used to limit The fixed present invention.
Embodiment 1:
Start the quick on-line computing model of COD electrochemistry, the control of this detector by the password that mobile phone or the network platform are arranged Monitored water sample is pumped into electrolytic cell from monitoring point by circuit start peristaltic pump, peristaltic pump, 10 cubic millimeters of the volume of electrolytic cell, When the water sample being pumped into reaches 10mL, the magnetic switch of electrolysis top slot setting disconnects compacted to full signal, control circuit is discharged Dynamic pumping source, peristaltic pump stop working simultaneously, and control circuit is powered to electrode, and electrode generates OH hydroxyl radical free radical to electrolytic cell In water sample aoxidized, after oxidization time 30min disconnect electrode supply stop oxidation.Oxidation current value converts COD by electric current Current value is converted into COD numerical value by chip, then COD numerical value conversion is passed through control system at digital signal again by control system The 2G or 4G of setting launch.It is received using mobile phone or the network platform.COD electrochemistry is quickly monitored on-line and is completely closed.
Embodiment 2:
After completing 1 process of embodiment for the first time, this COD electrochemistry is quickly monitored on-line in the completely closed state.Implement When second (or n-th) monitoring: starting COD electrochemistry by the password that mobile phone or the network platform are arranged and quickly monitor on-line Instrument, this detector control circuit start peristaltic pump antiport, and primary monitoring water sample preceding in electrolytic cell is extracted out, electrolysis is worked as When slot water sample exhausts completely, the magnetic switch of bottom of electrolytic tank setting gives water outlet spacing wave, and peristaltic pump power supply stops, control circuit Wriggling pumping source extremely starts to peristaltic pump Positive work afterwards, peristaltic pump from monitoring point by monitored water sample be pumped into electrolytic cell into The cleaning of row electrolytic cell, ejected wash water are flowed out from bottom water outlet, and bottom water outlet solenoid valve is closed after cleaning 5min, peristaltic pump power supply It disconnects, electrolytic cell water sample is 10mL at this time.Control circuit is powered to electrode, and electrode generates OH hydroxyl radical free radical in electrolytic cell Water sample aoxidized, after oxidization time 30min disconnect electrode supply stop oxidation.Oxidation current value converts COD core by electric current Current value is converted into COD numerical value by piece, then is set COD numerical value conversion by control system again at digital signal by control system The 2G or 4G set launches.It is received using mobile phone or the network platform.COD electrochemistry is quickly monitored on-line and is completely closed.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair It is bright range is claimed to be determined by the appended claims.

Claims (3)

1. a kind of method that COD electrochemistry is quickly monitored on-line, which comprises the steps of:
(1) construct a kind of quick on-line computing model of COD electrochemistry, comprising: sample cell, working electrode, reference electrode, peristaltic pump, Magnetic stirring apparatus, solar battery, solar energy electroplax, electric current conversion COD chip, wireless transmission transmitting terminal, radio transceiver End, the working electrode is embedded in reference electrode to be prepared by insulating materials, and volume is institute in the sample cell of 50ml to 100ml It states sample bottom of pond portion and places the magnetic stir bar that length is less than 2cm, be placed on magnetic stirring apparatus, complete in sample continuous mode Agitation task；Working electrode connection provides the solar battery of electric current, voltage value 2.5v, solar battery it is daily Charging is completed by solar energy electroplax；The sample cell injection port connects peristaltic pump by conduit, during completion sample is monitored on-line Sample introduction work；The working electrode output end connection electric current converts COD chip, completes electric current in working electrode continuous mode and disappears The calculating and measurement of consumption, electric current needed for electric current conversion COD chip is run are provided by the solar battery；It is converted by electric current The COD data that COD chip obtains carry out 4G wireless transmission by wireless transmission transmitting terminal, and are received by radio transceiver end To user computer, it is wirelessly transferred electric current needed for transmitting terminal provides operation by solar battery；The working electrode is changed using nanometer Property silica prepares stone using thermal-cracking method as carrier, then using the waste containing more carbon in PETROLEUM PROCESSING as raw material Black alkene is simultaneously modified it, carries out compound formed with silica nanometer modified material carrier afterwards；
(2) sewage is pumped into oxidation trough by peristaltic pump, the flow of peristaltic pump is 20mL/min；
(3) the organic matter complete oxidation in sewage is become by H by the OH hydroxyl radical free radical that electrochemical working electrode generates2O and CO2, working electrode operating voltage 2.4V, 15 μ A of operating current；Oxidization time 5-30min；Power supply 6V, 1.6A, 10W；Electricity Organic matter complete oxidation in sewage is H by extremely generated OH hydroxyl radical free radical2O and CO2Range be 1--50000Mg/ L；
(4) current value is converted into COD numerical value by electric current conversion COD chip by oxidation current value, passes through the complete oxidation mistake of foundation The electric current of journey and the corresponding relationship of oxygen demand are converted into COD (chemical oxygen consumption (COC)) numerical value by current value；Oxidation current and chemistry Oxygen demand is a linear relationship, can establish electric signal and digital signal translative mode；
(5) pass through the circuit set for COD numerical value conversion into digital signal；
(6) by signal transmission system, COD digital signal transmission is gone out using 4G signal generator；
(7) it carries out signal reception by mobile phone or the network platform and implements to control, realize the long-range control of on-line computing model.
2. the method that COD electrochemistry according to claim 1 is quickly monitored on-line, it is characterised in that: the peristaltic pump is Two-way pump.
3. the method that COD electrochemistry according to claim 1 is quickly monitored on-line, it is characterised in that: by oxygen in step (2) Change groove top portion is provided with magnetic switch makes peristaltic pump stop working to full signal is discharged.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110887878A (en) * 2019-11-04 2020-03-17 南开大学 Microflow water quality COD on-line detection and remote monitoring system and method

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