CN2572406Y - Step coulombmeter - Google Patents
Step coulombmeter Download PDFInfo
- Publication number
- CN2572406Y CN2572406Y CN 02248255 CN02248255U CN2572406Y CN 2572406 Y CN2572406 Y CN 2572406Y CN 02248255 CN02248255 CN 02248255 CN 02248255 U CN02248255 U CN 02248255U CN 2572406 Y CN2572406 Y CN 2572406Y
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- CN
- China
- Prior art keywords
- utility
- model
- analog switch
- circuit
- bidirectional analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 230000010354 integration Effects 0.000 claims abstract description 12
- 230000002457 bidirectional effect Effects 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 229910052697 platinum Inorganic materials 0.000 abstract description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract 2
- 230000002146 bilateral effect Effects 0.000 abstract 2
- 150000004699 copper complex Chemical class 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 239000001272 nitrous oxide Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000013256 coordination polymer Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004832 voltammetry Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 238000003869 coulometry Methods 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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- Investigating Or Analysing Biological Materials (AREA)
Abstract
The utility model relates to a step coulomb meter which belongs to an analytical chemistry instrument. The utility model is composed of a clock pulse generator (1), a counter (2), a step potential setting circuit (3), a bilateral analog switch A (4), a bilateral analog switch B (6), a current amplifying circuit (5) and a current integration arithmetic circuit (7). When the utility model is combined with a large ring copper complex which is of a platinum black decorative platinum electrode, trace amount nitrous oxide can be measured. The utility model has the advantages of stable performance, strong anti-interference, high sensitivity, low detection limit, convenient use, light weight, small volume, etc. The utility model is suitable for the field analysis.
Description
The utility model relates to a kind of analytical chemistry instrument.
Voltammetry is the electroanalysis chemical process of using always, but the insufficient sensitivity height is difficult to measure to some trace constituents in a lot of occasions.At this problem, inventor of the present utility model proposes and has set up the step voltammetry, and has designed corresponding multifunctional microcomputer control step voltamograph.Through application practice and research for many years, find that its sensitivity still can further improve.
The purpose of this utility model is set up a kind of new electroanalysis chemical process and is designed to new Electroanalytical Chemistry instrument----step coulomb meter on the basis of existing technology.This new instrument can further improve sensitivity, and easy and simple to handle, in light weight, volume is little.
Main technical schemes of the present utility model is on the basis of step voltammetry, changes the amperometric determination of step voltamograph into coulometry, makes the step coulomb meter.Wherein coulometry uses the integrating circuit of electric current to the time.
Advantage of the present utility model is stable performance, and anti-interference strong, highly sensitive, easy to use, in light weight, volume is little, is fit to on-the site analysis etc., and concentration can directly show in digital watch.
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is a basic block diagram of the present utility model.
Fig. 2 is three step electronic switching circuit figure of the present utility model.
Fig. 3 is the circuit diagram of each step potential initialization circuit of the present utility model.
Fig. 4 is the circuit diagram of three step electric weight of the present utility model and current amplification circuit.
With reference to Fig. 1, the utility model instrument is by clock signal generator (1), and counter (2), step potential initialization circuit (3), bidirectional analog switch A (4), bidirectional analog switch B (6), current amplification circuit (5) and current integration computing circuit (7) are formed.The output of clock signal generator (1) is access to the input end of counter (2), and the output terminal of counter (2) is access to the control end of bidirectional analog switch A (4) and bidirectional analog switch B (6).The output terminal of step potential initialization circuit (3) is access to the normal phase input end of operational amplifier through bidirectional analog switch A (4), the inverting input of operational amplifier and output terminal respectively with the contrast electrode (R) of electrochemical cell with the utmost point (C) is connected.The input end of current amplification circuit (5) is connected with the working electrode (W) of electrochemical cell, and its output terminal is access to current integration computing circuit (7) through bidirectional analog switch B (6), and current integration computing circuit (7) output terminal is connected with display (digital electric meter).
The pulse that clock signal generator (1) produces certain frequency is added on the counter (2), makes the high-low level of counter (2) output corresponding frequencies, drives bidirectional analog switch (4,6) and is switched on or switched off.Thereby the voltage of three ladders of step potential initialization circuit (3) generation sequentially is added in the utmost point.Each ladder gained electric current is directly exported or is changed electric weight into through current integration circuit (7) behind current amplification circuit (5) and is presented on the digital voltmeter with millivolt.
As required, three, five or seven step potential initialization circuits (3) can be set, be access to bidirectional analog switch A (4) respectively, to make three step coulomb meters, five step coulomb meters or seven step coulomb meters.
Below in conjunction with Fig. 2～4, be example with three step coulomb meters, the principle of work of the present utility model and the course of work are described.
With reference to Fig. 2, form the time clock device by IC1 (CC4069), pulsed frequency is determined by R.C, can change clock frequency when changing R, this pulse signal is sent into the CP end (counting with rising edge of a pulse) of decimal system count decoding integrator IC2 (CC4017) and negative edge counting end EN connects low level through differential (R1C1).When first time clock acted on the CP end, Y0 became high level, analog switch SWA, SWA (1) conducting.When second time clock arrives (CP end), make Y0 return back to low level, SWA, SWA (1) switch opens circuit, and Y1 becomes high level, electronic switch SWB, SWB (2) conducting.Equally, when the 3rd time clock arrives, make Y2 become high level, Y1 then returns back to low level; When the 4th time clock arrived, Y2 returned back to low level, and Y3 becomes high level, drives the controllable silicon trigger electrode immediately, and the controllable silicon conducting drives relay B adhesive, and time clock stops.The CP end of input IC2 (CC4017), circuit can stop counting.Keep Y3 at high level forever.SWA, SWB, SWC and SWA (1), SWB (2), SWC (3) are in off state, and by adding input signal A.B.C point different (through setting) current potential, circuit has just been finished once and followed back like this, to three steps of extreme appearance (ladder) current potential.
Will heavily sweep once again and follow back, as long as earlier panel-switch is placed return-to-zero, IC2 in the circuit (CC4017) clear terminal R becomes high level (controllable silicon T extinguishes), and Y3 changes back to low level.Circuit is in cleared condition, and at this moment panel passage pilot lamp O sends red light, and B places scanning position panel-switch.Not conducting of controllable silicon, not adhesive of relay B, normally closed point is connected the time clock passage.Circuit just carries out a conducting and follows back, becomes high level until Y3, has finished once again and has followed back.
With reference to Fig. 3, R11, R12, W3, W4, W5 and IC4, IC5, IC6, SWA, SWB, SWC form setting (adjustable) voltage (constant voltage) of triple channel (ladder), and IC4, IC5, IC6 constitute buffer amplifier.The setting current potential of first passage (i.e. first ladder), regulate by W3, be connected to A point (being first passage switch SW A one end) through IC4 output, and the setting current potential of second, third passage (second, third ladder) also is connected to IC5, IC6 input end respectively by W4, W5 (adjustable voltage) respectively, its output terminal is respectively to B point and the C point of SWB, SWC, switch SW A, SWB, the SWC other end separately link together and export the IC7 input end to, and IC7 connects electrode and contrast electrode.When SWA, SWB, SWC sequential turn-on, extreme just order is appearred the setting current potential of each ladder.
With reference to Fig. 4, each ladder gained electric current is directly exported or is changed electric weight into through integration after amplifying and is presented at digital voltmeter with millivolt, constitute current amplifier by IC8 (OPA128), working electrode (the W utmost point) is connected on the inverting input of operational amplifier IC8 (OPA128); R6, R7, R8 form the adjusting current amplification factor, and resistance R 3, R4, R5. and W1 form zero point and regulate. (wherein R3, R4, R5 form thick grade. a thin shelves .W1 constitutes stepless zeroing); IC9 (CA3130E) constitutes integral operation amplifier.R13 and C1, C2 constitute integration constant (by setting the size of C1 and C2, integration speed can be transferred to totally two grades of 0.1 second and 1 seconds, K5 is the discharge switch of C1 or C2).Measure a certain passage integration, be connected on electronic switch SWA (1), SW (2), SW (3) beginning respectively by K3; SWA, SWB, SWC and SWA (1) .SWB (2), SWC (3) are synchronously, i.e. during SWA conducting, SWA (1) is conducting simultaneously also.
The utility model can carry out oxidation, reduction, the many potential steps process that reoxidizes.Experiment shows that this instrument performance is good, and is highly sensitive, and the system that be particularly suitable for through oxidation, reduce, sensitivity increases when reoxidizing can make detectability reduce to 3.5 * 10
-10Mol/L, the range of linearity is 1.5 * 10
-9～4.5 * 10
-6Mol/L.And it is little, in light weight to have a volume, and antijamming capability is strong, and is easy to use, is suitable for characteristics such as on-site measurement.
Enumerate example application of the present utility model below.
Nitrogen monoxide (NO) is an important physical endogenous biomolecule, participates in many physiology courses, is that life exists one of main micromolecule that is relied on.NO detects significant to studying its physiological function.Exist in the many in vivo tissues of NO, when NO content is 10
-9During the mol/L level, then bring into play its information transfering action.In order to detect the NO of this level concentration, a lot of methods have been proposed, detect but have only electrochemical method to carry out real-time online biological living, NO is provided temporal information in vivo, the research in this field is developed rapidly.We use three step coulomb meters of utility model, modify the platinum electrode catalytic oxidation and measure in conjunction with big ring copper complex-platinum black, carry out oxidation, reduction reoxidizes process, successfully the detectability of NO is reduced to 3.5 * 10
-10Mol/L, the range of linearity is 1.5 * 10
-9～4.5 * 10
-6Mol/L.
So far, detailed explanation has been done in structure of the present utility model, principle of work and application.The utility model is not limited to the foregoing description, and to each components and parts in the circuit, all available function is identical, be equal to or close components and parts replace, and the also available function of each circuit is identical, be equal to or close circuit replaces, but all should be included among the utility model.
Claims (2)
1. step coulomb meter, it is characterized in that: by clock signal generator (1), counter (2), step potential initialization circuit (3), bidirectional analog switch A (4), bidirectional analog switch B (6), current amplification circuit (5) and current integration computing circuit (7) are formed; The output of clock signal generator (1) is access to the input end of counter (2), and the output terminal of counter (2) is access to the control end of bidirectional analog switch A (4) and bidirectional analog switch B (6); The output terminal of step potential initialization circuit (3) is access to the normal phase input end of operational amplifier through bidirectional analog switch A (4), the inverting input of operational amplifier and output terminal respectively with the contrast electrode (R) of electrochemical cell with the utmost point (C) is connected; The input end of current amplification circuit (5) is connected with the working electrode (W) of electrochemical cell, and its output terminal is access to current integration computing circuit (7) through bidirectional analog switch B (6), and current integration computing circuit (7) output terminal is connected with display (digital electric meter).
2. step coulomb meter according to claim 1 is characterized in that: three, five or seven step potential initialization circuits (3) can be set, be access to bidirectional analog switch A (4) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02248255 CN2572406Y (en) | 2002-09-26 | 2002-09-26 | Step coulombmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02248255 CN2572406Y (en) | 2002-09-26 | 2002-09-26 | Step coulombmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2572406Y true CN2572406Y (en) | 2003-09-10 |
Family
ID=33718926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02248255 Expired - Fee Related CN2572406Y (en) | 2002-09-26 | 2002-09-26 | Step coulombmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2572406Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743801A (en) * | 2014-01-02 | 2014-04-23 | 上海大学 | Droplet-microfluidic-based preparation method of platinum black-modified electrode biosensor and application thereof |
-
2002
- 2002-09-26 CN CN 02248255 patent/CN2572406Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743801A (en) * | 2014-01-02 | 2014-04-23 | 上海大学 | Droplet-microfluidic-based preparation method of platinum black-modified electrode biosensor and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |