CN202562879U - Portable COD (chemical oxygen demand) tester - Google Patents
Portable COD (chemical oxygen demand) tester Download PDFInfo
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- CN202562879U CN202562879U CN2012201273619U CN201220127361U CN202562879U CN 202562879 U CN202562879 U CN 202562879U CN 2012201273619 U CN2012201273619 U CN 2012201273619U CN 201220127361 U CN201220127361 U CN 201220127361U CN 202562879 U CN202562879 U CN 202562879U
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Abstract
The utility model discloses a portable COD (chemical oxygen demand) tester, which comprises a data processing system, a detector and an electrochemical analysis device, wherein the data processing system is connected with the detector via a circuit, and the detector is connected with an electrode of the electrochemical analysis device via the circuit. The portable COD tester is lightweight in structure, rapid and accurate.
Description
Technical field
The utility model belongs to the electrochemical analysis field, is specifically related to a kind of portable COD detector.
Background technology
COD (Chemical Oxygen Demand) is one of important technology index that characterizes water body organic contamination degree; Be called COD or chemical oxygen consumption (COC) again, be meant and utilize the chemical oxidizing agent potassium dichromate oxidation operation in the water to be decomposed the amount of oxygen that is consumed.Along with the continuous reinforcement of environmental consciousness, people are also increasingly high to water quality requirement, and the COD that river, water body, waste water etc. all need be measured it realizes the detection to environment.What at present domestic and international COD assay method adopted at most is standard circumfluence method, comprising: permanganate indices method and potassium dichromate oxidation.The former is mainly used in underground water and cleaner surface water analysis, and the latter is used for the analysis of industrial waste water and sanitary sewage more.It is accurate that standard circumfluence method has the result of mensuration, high repeatability and other advantages, but also have significant disadvantages, and the time-consuming electricity that takes, reagent dosage is big, and a large amount of silver salt, mercury salt, abandoning of chromic salts are prone to cause secondary pollution.
At present, portable COD analyser mainly adopts AAS.Spectrphotometric method for measuring COD mainly is divided into two kinds of patterns: potassium dichromate is cleared up-photometric method and UV-VIS spectrophotometry.The photomultiplier that these two kinds of patterns all need light source, light path system and use as detecting device so just causes instrument cost higher, difficult C&M.
Potassium dichromate is cleared up-photometric method: after water sample was cleared up, with its absorbance of spectrphotometric method for measuring, this kind instrument shortcoming was that digestion process need consume a large amount of concentrated sulphuric acids and expensive silver sulfate; And in order to eliminate the interference of chlorion; Needs adding great toxicity mercuric sulfate also needs high temperature to clear up, though digestion time reduces along with clearing up improving constantly of technology outside sheltering; But at least still need 10-15 minute, can't avoid the generation of secondary pollution.Clear up instrument simultaneously and also occupy certain volume and weight, make portable COD detector seem heavy burdensome.
UV-VIS spectrophotometry: without clearing up; Based on water sample COD and water sample at the 254mm place the correlativity between the UV absorption signal size; With Xe (or low pressure mercury lamp) is light source; Through twin-beam Instrument measuring water sample at the 254mm place the absorption signal of signal and visible light (546mm), the two difference can be obtained water sample COD value after linearization process.When deciding COD value of waste water, because sample without clearing up direct mensuration, has so just caused this method not ideal to the accuracy of a lot of COD value of waste water mensuration with the UV instrumentation.
The utility model content
The utility model is in order to overcome the deficiency that above prior art exists, provide a kind of structure lightly, portable COD detector fast and accurately.
The purpose of the utility model realizes through following technical scheme: this portable COD detector; It is characterized in that: comprise data handling system, detecting device and electrochemical analysis device; Said data handling system is connected with detector circuit, and detecting device is connected with the telegraph circuit of electrochemical analysis device.
More concrete; The processor of said data handling system is a single-chip microcomputer; The display of data handling system is a touch-screen, and data handling system is provided with USB connector or bluetooth communication module, and data handling system is through USB connector or the external computer of bluetooth communication module.
In order to make compact conformation convenient, detector also comprises housing, and said data handling system, detecting device are placed in the housing, and housing has saucer.
More concrete, said electrochemical analysis device comprises analyzer cup, visual operation tube and head, and analyzer cup, visual operation tube are placed on the saucer, and head is contained on the visual operation tube.
Said electrode is auxiliary electrode, contrast electrode and working electrode, and head comprises motor and stirring rod, and motor is installed in head inside; The output shaft of motor connects stirring rod; The output shaft of motor is positioned at the central axis of head, and stirring rod is positioned at head below and inserts analyzer cup, is provided with three electrode contacts below the head; Be respectively auxiliary electrode joint, contrast electrode joint and working electrode joint; Auxiliary electrode is installed in below the auxiliary electrode joint, and contrast electrode is installed in below the contrast electrode joint, and working electrode is installed in below the working electrode joint; Auxiliary electrode, contrast electrode, working electrode insert analyzer cup, and auxiliary electrode, contrast electrode, working electrode are connected with detecting device through data line respectively.When needing to stir, connect stirring rod, by the Single-chip Controlling motor, the uniform rotation of motor-driven stirring rod is stirred, and reaches the purpose of liquid in the even stirring analyzer cup.The rotating speed of the output shaft of motor can be regulated through single-chip microcomputer.
As a kind of preferred, said working electrode is nanometer PbO
2The PbO of membrane electrode, ion doping
2Membrane electrode or TiO
2Membrane electrode.
As a kind of preferred, said auxiliary electrode is a platinum electrode.
As a kind of preferred, said contrast electrode is silver electrode, silver chloride electrode or saturated calomel electrode.
Said three electrode contacts are equipped with external thread, and three electrode upper ends are equipped with internal thread, and the electrode upper end is screwed on the electrode contact; Three electrode contacts tilt towards the central axis of head, are convenient to electrode and stretch into analyzer cup.
The side of said visual operation tube has a window that is used for liquid feeding and ventilation.The visual operation tube is transparent, makes things convenient for observation experiment, application of sample and ventilation body in the convenient experiment of window.
Certainly, when electrode is the structures that two or four also are suitable for the utility model, electrode is two, is respectively contrast electrode, working electrode, and perhaps electrode is four, is respectively contrast electrode, working electrode, auxiliary electrode, auxiliary electrode.
The utility model has following advantage with respect to prior art:
One, the utility model need not to clear up; Volume is light and handy; Having realized the integrated of stirring, detection, calculating, can directly detect chemical oxygen demand of water body and obtain a result, specifically is the device that can directly detect, calculate, preserve, show, print the COD testing result; The outstanding advantage of this measure CO D device be fast, accurately, need not to clear up, secondary pollution is few, light.
Two, this portable COD detector; Only need take off head; Can three electrodes be screwed with the screw thread correspondence and be fixed on working electrode joint, auxiliary electrode joint and the contrast electrode joint, simple and easy, directly, fixing three electrodes easily, avoided because the fixing experimental result of bringing of electrode position fluctuates; Reduce the manual operation error in the experiment, improve the reappearance of experiment.
Three, single chip circuit and touch-screen are placed on enclosure interior, and volume is little.Head, visual operation tube, analyzer cup are movable.Electrode is fixed on the electrode contact, need not pass motor, can not pollute motor by burn into.
Four, the utility model can be applicable to that medicine, environmental protection, petrochemical complex, plating, electronics, food, daily use chemicals etc. relate to the every field that electrochemical analysis detects by the instrumentation software control.
Description of drawings
Fig. 1 is the outside drawing of the portable COD detector of the utility model.
Fig. 2 is the circuit diagram of the portable COD detector of the utility model, among the figure e be electron stream to, i is a current direction.
Fig. 3 is the front elevation of electrochemical analysis device.
Fig. 4 is the head upward view.
Fig. 5 is the front view of any electrode.
Fig. 6 is the electrode cut-open view of Fig. 5.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Portable COD detector as depicted in figs. 1 and 2 comprises data handling system, detecting device 6 and electrochemical analysis device, and data handling system is connected with detector circuit, and detecting device is connected with the telegraph circuit of electrochemical analysis device.
The processor of data handling system is a single-chip microcomputer, and the display of data handling system is a touch-screen 7, and data handling system is provided with USB connector 15, and data handling system is through USB connector 15 external computers.
In single-chip microcomputer, be provided with in advance and calculate COD value module, display module, power failure protection module, clock module; And by these modules of single-chip microcomputer integrated management; By disposable software programming Control whole operation flow process; Data to measured are calculated, are preserved, demonstration etc., reach the purpose of quick acquisition chemical oxygen demand of water body COD value.
In order to make compact conformation convenient, detector also comprises housing 16, and data handling system, detecting device 6 are placed in the housing 16, and housing 16 has saucer 17.
As shown in Figure 3, electrochemical analysis device comprises analyzer cup 12, visual operation tube 5 and head 2, and analyzer cup 12, visual operation tube 5 are placed on the saucer 17, and head 2 is contained on the visual operation tube 5.
Like Fig. 4,5, shown in 6, electrode 13 is auxiliary electrode, contrast electrode and working electrode, and head 2 comprises motor 1 and stirring rod; Motor 1 is installed in head 2 inside, and the output shaft 9 of motor 1 connects stirring rod, and the output shaft 9 of motor 1 is positioned at the central axis of head 2; Stirring rod is positioned at the head below and inserts analyzer cup 12; Be provided with three electrode contacts below the head 2, be respectively auxiliary electrode joint 3, contrast electrode joint 8 and working electrode joint 10, auxiliary electrode is installed in below the auxiliary electrode joint 3; Contrast electrode is installed in below the contrast electrode joint 8; Working electrode is installed in below the working electrode joint 10, and auxiliary electrode, contrast electrode, working electrode insert analyzer cup 12, and auxiliary electrode, contrast electrode, working electrode are connected with detecting device 6 through data line 11 respectively.When needing to stir, connect stirring rod, by Single-chip Controlling motor 1, motor 1 drives the stirring rod uniform rotation and stirs, and reaches the purpose of liquid in the even stirring analyzer cup 12.The rotating speed of the output shaft 9 of motor 1 can be regulated through single-chip microcomputer.
In the present embodiment, working electrode is nanometer PbO
2Membrane electrode.Auxiliary electrode is a platinum electrode.Contrast electrode is a silver electrode.
Three electrode contacts are equipped with external thread, and three electrode upper ends 14 are equipped with internal thread, and electrode 13 upper ends are screwed on the electrode contact; Three electrode contacts tilt towards the central axis of head 2, are convenient to electrode 13 and stretch into analyzer cup 12.
The side of visual operation tube 5 has a window 4 that is used for liquid feeding and ventilation.Visual operation tube 5 is transparent, makes things convenient for observation experiment, application of sample and ventilation body in the window 4 convenient experiments.
When this portable COD detector used, at first energized connected contrast electrode, auxiliary electrode, working electrode and stirring rod at head 2, inserted a certain amount of electrolytic solution in the analyzer cup 12, started software, and working electrode is applied certain operating potential.The quantitative liquid to be detected of microsyringe or liquid-transfering gun picked-up then, the window 4 through visual operation tube 5 is liquid adding electrolytic solution to be detected.When the organic substance in the liquid to be detected is diffused into working electrode surface, can on working electrode, be produced corresponding electric signal simultaneously by catalytic oxidation, this electric signal is transferred to detecting device 6, obtains digital signal through amplification, analog to digital conversion.
After adding liquid to be detected, in the regular hour, add standard solution for several times, obtain different electric signal, convert digital signal equally into, this digital signal finally calculates the COD value of water sample through data handling system.
Above-mentioned embodiment is the preferred embodiment of the utility model; Can not limit the utility model; Other any change or other equivalent substitute mode that does not deviate from the technical scheme of the utility model and made is included within the protection domain of the utility model.
Claims (10)
1. portable COD detector, it is characterized in that: comprise data handling system, detecting device and electrochemical analysis device, said data handling system is connected with detector circuit, and detecting device is connected with the telegraph circuit of electrochemical analysis device.
2. portable COD detector according to claim 1; It is characterized in that: the processor of said data handling system is a single-chip microcomputer; The display of data handling system is a touch-screen; Data handling system is provided with USB connector or bluetooth communication module, and data handling system is through USB connector or the external computer of bluetooth communication module.
3. portable COD detector according to claim 1 is characterized in that: also comprise housing, said data handling system, detecting device are placed in the housing, and housing has saucer.
4. portable COD detector according to claim 3, it is characterized in that: said electrochemical analysis device comprises analyzer cup, visual operation tube and head, and analyzer cup, visual operation tube are placed on the saucer, and head is contained on the visual operation tube.
5. portable COD detector according to claim 4 is characterized in that: said electrode is auxiliary electrode, contrast electrode and working electrode, and head comprises motor and stirring rod; Motor is installed in head inside, and the output shaft of motor connects stirring rod, and the output shaft of motor is positioned at the central axis of head; Stirring rod is positioned at the head below and inserts analyzer cup; Be provided with three electrode contacts below the head, be respectively auxiliary electrode joint, contrast electrode joint and working electrode joint, auxiliary electrode is installed in below the auxiliary electrode joint; Contrast electrode is installed in below the contrast electrode joint; Working electrode is installed in below the working electrode joint, and auxiliary electrode, contrast electrode, working electrode insert analyzer cup, and auxiliary electrode, contrast electrode, working electrode are connected with detecting device through data line respectively.
6. portable COD detector according to claim 5 is characterized in that: said working electrode is nanometer PbO
2Membrane electrode or TiO
2Membrane electrode.
7. portable COD detector according to claim 5, it is characterized in that: said auxiliary electrode is a platinum electrode.
8. portable COD detector according to claim 5 is characterized in that: said contrast electrode is silver electrode, silver chloride electrode or saturated calomel electrode.
9. portable COD detector according to claim 5 is characterized in that: said three electrode contacts are equipped with external thread, and three electrode upper ends are equipped with internal thread, and the electrode upper end is screwed on the electrode contact; Three electrode contacts tilt towards the central axis of head.
10. portable COD detector according to claim 4 is characterized in that: the side of said visual operation tube has a window that is used for liquid feeding and ventilation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201273619U CN202562879U (en) | 2012-03-29 | 2012-03-29 | Portable COD (chemical oxygen demand) tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201273619U CN202562879U (en) | 2012-03-29 | 2012-03-29 | Portable COD (chemical oxygen demand) tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202562879U true CN202562879U (en) | 2012-11-28 |
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ID=47212524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201273619U Expired - Fee Related CN202562879U (en) | 2012-03-29 | 2012-03-29 | Portable COD (chemical oxygen demand) tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202562879U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674936A (en) * | 2013-12-11 | 2014-03-26 | 常熟理工学院 | Method and device for rapidly detecting COD (chemical oxygen demand) on basis of electrochemical luminescence |
| CN110945348A (en) * | 2017-10-20 | 2020-03-31 | 百灵达有限公司 | Electrical analyzer for determining the presence or amount of an analyte in an aqueous sample by amperometry |
-
2012
- 2012-03-29 CN CN2012201273619U patent/CN202562879U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674936A (en) * | 2013-12-11 | 2014-03-26 | 常熟理工学院 | Method and device for rapidly detecting COD (chemical oxygen demand) on basis of electrochemical luminescence |
| CN103674936B (en) * | 2013-12-11 | 2016-05-04 | 常熟理工学院 | A kind of based on electrochemical luminescence COD method for quick and device |
| CN110945348A (en) * | 2017-10-20 | 2020-03-31 | 百灵达有限公司 | Electrical analyzer for determining the presence or amount of an analyte in an aqueous sample by amperometry |
| CN110945348B (en) * | 2017-10-20 | 2022-09-06 | 百灵达有限公司 | Electrical analyzer for determining the presence or amount of an analyte in an aqueous sample by amperometry |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20210329 |