CN109521077A - A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device - Google Patents
A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device Download PDFInfo
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- CN109521077A CN109521077A CN201811346457.2A CN201811346457A CN109521077A CN 109521077 A CN109521077 A CN 109521077A CN 201811346457 A CN201811346457 A CN 201811346457A CN 109521077 A CN109521077 A CN 109521077A
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Abstract
The invention discloses a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction devices, including two-wave interpretation, exciting current inverting module, constant current source module, signal acquisition module and microprocessor module, the two-wave interpretation is placed in reaction solution, the constant current source module is connected by exciting current inverting module with two platinized platinums of two-wave interpretation, the exciting current inverting module is connected with signal acquisition module, and the signal acquisition module is connected with microprocessor module.The present invention carries out titration end-point judgement using two-wave interpretation, and electrode structure is simple, and maintenance rate is low, long service life, and the titration end-point indicating mode of use has uniqueness, and End point indication is accurate, and is not influenced by electrode voltage drift.
Description
Technical field
The present invention relates to a kind of online Analysis Apparatus of Permanganate Index titration end-point instruction devices, more particularly to a kind of double
Platinum electrode formula online Analysis Apparatus of Permanganate Index titration end-point instruction device.
Background technique
Potassium permanganate oxidation-titration is the analysis principle that permanganate index water quality online analyzer is widely used.
In titration process, oxidation-reduction potential electrode (ORP electrode) is generallyd use to monitor the oxidation-reduction potential of reaction solution,
Near titration end-point, reaction system oxidation-reduction potential can be gradually risen, and be stable at a certain value, by oxidation-reduction potential
Threshold decision the judgement to titration end-point can be realized.For ORP electrode using platinum as working electrode, silver chlorate is reference electrode, with
Micropore material is usually saturated potassium chloride solution as liquid border, reference electrode filling liquid, can generate and be lost at liquid border, and one
Aspect meeting interference measurement, on the other hand will lead to electrode potential drift, to influence the accuracy of titration end-point judgement, reduces and divides
Analyzer performance.For this purpose, the ORP electrode of online Analysis Apparatus of Permanganate Index needs periodic maintenance, periodic replacement, fortune is improved
Tie up cost.
Potassium permanganate oxidation-titration has obtained to have extensively in online Analysis Apparatus of Permanganate Index.It was titrating
Cheng Zhong, existing in-line analyzer generally use ORP electrode to monitor reaction system current potential and carry out end by threshold voltage
Point judgement.It is greater than a certain threshold voltage with reaction system ORP current potential to indicate titration end-point, there are deviations for End point indication.Make
It is easy aging with ORP electrode in the process, potential drifting is generated, needs to regularly replace, affects the overall performance performance of analyzer.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, a kind of two-wave interpretation formula permanganic acid is provided
Salt index in-line analyzer titration end-point instruction device carries out titration end-point judgement using two-wave interpretation, and electrode structure is simple, dimension
Shield rate is low, long service life, and the titration end-point indicating mode of use has uniqueness, and End point indication is accurate, and not by electrode electricity
Press drift effect.
In order to solve the above technical problems, the present invention provides a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration
End point indication device, characterized in that including two-wave interpretation, exciting current inverting module, constant current source module, signal acquisition module and
Microprocessor module, the two-wave interpretation are placed in reaction solution, the constant current source module by exciting current inverting module with
Two platinized platinums of two-wave interpretation are connected, and the exciting current inverting module is connected with signal acquisition module, and the signal is adopted
Collection module is connected with microprocessor module.
Further, the constant current source module includes reference voltage source, Precision Integrated differential amplifier, high input impedance fortune
Amplifier and sample resistance are calculated, the reference voltage source is inputted with sample resistance and height respectively by Precision Integrated differential amplifier
Impedance op-amps are connected.
Further, the constant current source module generates microampere magnitude exciting current.
Further, the two-wave interpretation includes two platinized platinums, and the spacing between two platinized platinums is 5~10mm.
Further, the signal acquisition module will input micro- place by analog-to-digital conversion after the amplification filtering of two-wave interpretation signal
It manages in device module.
Further, the microprocessor module according to collected electrode signal data sequence maximizing and provides
Titration end-point indication signal.
Further, when the exciting current inverting module was in the case where microprocessor module is controlled with 12 hours or 24 hours
Between be spaced and commutate to exciting current.
Advantageous effects of the invention: the device applies small constant electricity in titration process on two-wave interpretation
The voltage on two-wave interpretation is flowed and acquired simultaneously, indicates to titrate by the variation of voltage on two-wave interpretation under constant current excitation
Terminal.The distinguishing feature of the device is that the voltage at titration end-point, on two-wave interpretation has maximum, can by the maximum
Accurately to indicate titration end-point.It is also devised with exciting current inverting module in the device simultaneously, at a certain time interval to sharp
It encourages electric current to commutate, effectively reduces the ion attachment of electrode surface, further improve reliability.The present invention is using double platinum
Electrode carries out titration end-point judgement, and electrode structure is simple, and maintenance rate is low, long service life.The titration end-point that the present invention uses refers to
Show that mode has uniqueness, End point indication is accurate, and is not influenced by electrode voltage drift.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the functional block diagram of constant current source module of the present invention；
Fig. 3 is titration voltage curve of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index End point indication device, by two-wave interpretation
1, exciting current inverting module 2, constant current source module 3, signal acquisition module 4, the composition of microprocessor module 5.Refer in permanganate
In number in-line analyzer titration process, two-wave interpretation 1 is placed in reaction solution 6, and constant current source module 3 generates microampere magnitude excitation electricity
Overdrive current inverting module 4 is flowed through to be applied on two platinized platinums 1-1,1-2 of two-wave interpretation.Exciting current shown in Fig. 1
Under 2 state of inverting module, exciting current I is flowed into from platinized platinum 1-1, after reaction solution 6, is flowed out from platinized platinum 1-2.When sharp
When encouraging electric current inverting module 2 and switching to another state, exciting current I will be flowed into from platinized platinum 1-2, after reaction solution 6,
It is flowed out from platinized platinum 1-1.Spacing between two platinized platinums 1-1,1-2 of two-wave interpretation 1 is d, and d is usually chosen as 5~10mm.Swash
Potential difference can be generated on platinized platinum 1-1,1-2 by encouraging when electric current I flows through reaction solution 6, form voltage signal.It is produced on two-wave interpretation 1
Raw voltage signal is through in 2 input signal acquisition module 4 of overdrive current inverting module.Signal acquisition module 4 is by two-wave interpretation 1
By in analog-to-digital conversion input microprocessor module 5 after signal amplification filtering.Microprocessor module 5 is believed according to collected electrode
Number sequence search maximum value simultaneously provides titration end-point indication signal, while controlling exciting current inverting module 2 with 12 hours
Or 24 hours time intervals commutate to exciting current.The Monitoring frequency of usual situation permanganate index is 6 times/day,
It can be commutated with 24 hours time intervals to exciting current under this frequency, it, can be with 12 hours time if being higher than this frequency
It commutates at interval.
As shown in Fig. 2, constant current source module 3 uses Holland current source structure, it is poor by reference voltage source 3-1, Precision Integrated
Dynamic amplifier 3-2, sample resistance 3-3, high input impedance operational amplifier 3-4 composition.Reference voltage source 3-1 passes through Precision Integrated
Differential amplifier 3-2 is connected with sample resistance 3-3 and high input impedance operational amplifier 3-4 respectively.Constant-current source 3 has good
Dynamic response characteristic, the constant current of microampere magnitude can be provided, constant current value is by reference voltage source 3-1 and sample resistance 3-3
It determines.
In titration process, liquor potassic permanganate is added dropwise in sodium oxalate solution permanganate index analyzer dropwise, instead
Answer process that can be described by following ion-reaction equation.
Before titration starts, reduction-state is contained only in solution, in the instillation reaction system of liquor potassic permanganate gradually
Generate oxidation state.Apparatus of the present invention are used to monitor the voltage change during this on two-wave interpretation, and carry out End point indication.Drop
Voltage signal during fixed on two-wave interpretation can be described by following formula.
E is the voltage signal on two-wave interpretation in formula；I is exciting current；X is titration score；R is thermodynamic equilibrium constant；T is
Thermodynamic temperature；N is receiving and losing electrons number；F is Faraday constant；K is constant；C is the concentration that titration starts pre reduction substance.By
Formula can obtain, and in certain solution environmental, at titration end-point (x=1), the voltage signal on two-wave interpretation is had greatly
Value, can indicate titration end-point by the maximum.Titration end-point is judged compared to ORP electrode to be greater than threshold voltage, this
The titration end-point of invention described device determines there is uniqueness, and maintainability is significantly better than ORP electrode End point indication device.Fig. 3
For voltage curve of the apparatus of the present invention in online Analysis Apparatus of Permanganate Index titration process.
Exciting current I is applied on two-wave interpretation, can generate electrolytic effect, is caused in actual water sample measurement in sample
Ion adheres on platinized platinum, and exciting current I reduces the ion on platinum plate electrode by commutating at a time interval thus
Attachment.
The device applies small constant current in titration process on two-wave interpretation and acquires on two-wave interpretation simultaneously
Voltage, titration end-point is indicated by the variation of voltage on two-wave interpretation under constant current excitation.The distinguishing feature of the device
It is that voltage at titration end-point, on two-wave interpretation has maximum, titration end-point can be accurately indicated by the maximum.Together
When the device in be also devised with exciting current inverting module, commutate at a certain time interval to exciting current, effectively drop
The ion attachment of low electrode surface, further improves reliability.The present invention carries out titration end-point judgement using two-wave interpretation,
Electrode structure is simple, and maintenance rate is low, long service life.The titration end-point indicating mode that the present invention uses has uniqueness, terminal
Instruction is accurate, and is not influenced by electrode voltage drift.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device, characterized in that including double platinum
Electrode, exciting current inverting module, constant current source module, signal acquisition module and microprocessor module, the two-wave interpretation are placed in
In reaction solution, the constant current source module is connected by exciting current inverting module with two platinized platinums of two-wave interpretation, described
Exciting current inverting module is connected with signal acquisition module, and the signal acquisition module is connected with microprocessor module.
2. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction dress according to claim 1
It sets, characterized in that the constant current source module includes that reference voltage source, Precision Integrated differential amplifier, high input impedance operation are put
Big device and sample resistance, the reference voltage source by Precision Integrated differential amplifier respectively with sample resistance and high input impedance
Operational amplifier is connected.
3. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction dress according to claim 1
It sets, characterized in that the constant current source module generates microampere magnitude exciting current.
4. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction dress according to claim 1
It sets, characterized in that the two-wave interpretation includes two platinized platinums, and the spacing between two platinized platinums is 5 ~ 10mm.
5. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction dress according to claim 1
Set, characterized in that the signal acquisition module by two-wave interpretation signal amplification filtering after by analog-to-digital conversion input microprocessor
In module.
6. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction dress according to claim 1
It sets, characterized in that the microprocessor module is according to collected electrode signal data sequence maximizing and provides titration
End point indication signal.
7. a kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction dress according to claim 1
It sets, characterized in that the exciting current inverting module is under microprocessor module control between 12 hours or 24 hours time
It commutates every to exciting current.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811346457.2A CN109521077A (en) | 2018-11-13 | 2018-11-13 | A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device |
| PCT/CN2019/105473 WO2020098361A1 (en) | 2018-11-13 | 2019-09-11 | Titration end point indicating device for permanganate index on-line analyzer of double platinum electrode type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811346457.2A CN109521077A (en) | 2018-11-13 | 2018-11-13 | A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device |
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| CN109521077A true CN109521077A (en) | 2019-03-26 |
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| WO (1) | WO2020098361A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020098361A1 (en) * | 2018-11-13 | 2020-05-22 | 国电南瑞科技股份有限公司 | Titration end point indicating device for permanganate index on-line analyzer of double platinum electrode type |
| CN112697959A (en) * | 2020-12-25 | 2021-04-23 | 北京金醍环境技术有限公司 | High-precision quantitative titration method and device applied to water quality online monitoring equipment |
| CN113030225A (en) * | 2021-03-10 | 2021-06-25 | 哈尔滨工程大学 | Judgment and automatic response method for molten salt purification end point |
| CN113049660A (en) * | 2021-03-10 | 2021-06-29 | 哈尔滨工程大学 | Intelligent response device and method for monitoring reaction endpoint in liquid electrolyte |
| CN114942299A (en) * | 2022-05-10 | 2022-08-26 | 杭州春来科技有限公司 | Titration end point analysis method and system based on permanganate index automatic analyzer |
| CN115656269A (en) * | 2022-11-11 | 2023-01-31 | 利诚检测认证集团股份有限公司 | Method for detecting acid value of edible oil based on platinum electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020098361A1 (en) * | 2018-11-13 | 2020-05-22 | 国电南瑞科技股份有限公司 | Titration end point indicating device for permanganate index on-line analyzer of double platinum electrode type |
| CN112697959A (en) * | 2020-12-25 | 2021-04-23 | 北京金醍环境技术有限公司 | High-precision quantitative titration method and device applied to water quality online monitoring equipment |
| CN113030225A (en) * | 2021-03-10 | 2021-06-25 | 哈尔滨工程大学 | Judgment and automatic response method for molten salt purification end point |
| CN113049660A (en) * | 2021-03-10 | 2021-06-29 | 哈尔滨工程大学 | Intelligent response device and method for monitoring reaction endpoint in liquid electrolyte |
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| CN114942299B (en) * | 2022-05-10 | 2023-08-01 | 杭州春来科技有限公司 | Titration endpoint analysis method and system based on permanganate index automatic analyzer |
| CN115656269A (en) * | 2022-11-11 | 2023-01-31 | 利诚检测认证集团股份有限公司 | Method for detecting acid value of edible oil based on platinum electrode |
| CN115656269B (en) * | 2022-11-11 | 2023-09-05 | 利诚检测认证集团股份有限公司 | Method for detecting acid value of edible oil based on platinum electrode |
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|---|---|
| WO2020098361A1 (en) | 2020-05-22 |
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