CN201373863Y - pH selective microelectrode - Google Patents
pH selective microelectrode Download PDFInfo
- Publication number
- CN201373863Y CN201373863Y CN200820228432U CN200820228432U CN201373863Y CN 201373863 Y CN201373863 Y CN 201373863Y CN 200820228432 U CN200820228432 U CN 200820228432U CN 200820228432 U CN200820228432 U CN 200820228432U CN 201373863 Y CN201373863 Y CN 201373863Y
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- glass sleeve
- sleeve pipe
- cone
- shaped glass
- electrode
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Abstract
The utility model discloses a pH selective microelectrode which comprises a conical glass sleeve; the cavity of the conical glass sleeve is filled with post-membrane electrolyte, the tip of the conical glass sleeve is filled with a hydrogen ion selective liquid membrane, an Ag/AgCl wire is arranged in the conical glass sleeve, the Ag/AgCl wire is fixed at the mouth of the conical glass sleeve and the conical glass sleeve is sealed by epoxy resin, the tip of the pH selective microelectrode is 1 to 10mu m, the linear response range pH is equal to 4 to 10, and the slope is minus 59.945Mv/pH. The electrode response time is short and generally less than 5s, the size is small, the manufacturing is simple and the price is low.
Description
Technical field
The utility model relates to a kind of microelectrode and preparation thereof, particularly a kind of pH selectivity micro-electrode.
Technical background
Serious environmental is polluted and is made wastewater treatment come into one's own day by day, and denitrogenation is as an important step of wastewater treatment, and pH has material impact to nitration denitrification, so discussion of denitrogenation mechanism and process optimization all be unable to do without the mensuration of pH.For a long time, owing to lack proper tools, people measure the pH of microscopic fields and rest on macroscopical basis, and the research of the variation of pH in the microcosmos area is lacked corresponding means of testing.
Summary of the invention
At defective or deficiency that above-mentioned prior art exists, the purpose of this utility model is, a kind of pH selectivity micro-electrode is provided, and the pH selectivity micro-electrode that the utility model is made is applicable to measures pH variation in active sludge or the biological membrane interior microscopic zone.
In order to realize above-mentioned task, the utility model is taked following technical solution:
A kind of pH selectivity micro-electrode, comprise a cone-shaped glass sleeve pipe, it is characterized in that, electrolytic solution after in the chamber of cone-shaped glass sleeve pipe, being filled with film, the point of cone-shaped glass sleeve pipe is marked with the hydrogen ion selective liquid film, the Ag/AgCl silk is installed in the cone-shaped glass sleeve pipe, at the oral area of cone-shaped glass sleeve pipe with epoxy resin fixedly Ag/AgCl silk and sealing cone-shaped glass sleeve pipe.
Some other characteristics of the present utility model are:
Described cone-shaped glass sleeve pipe is a mono-layer tube.
The tip length of described cone-shaped glass sleeve pipe is 1 μ m～10 μ m.
Electrolytic solution is by the KH of 0.04mol/L behind the described film
2PO
4, the NaOH of 0.023mol/L and 0.015mol/L NaCl form, the pH value transfers to 7.
Described hydrogen ion selective liquid film is dissolved in by 0.5g Alamine 304 and 0.035g sodium tetraphenylborate in the 2-nitrobenzophenone Octyl Ether of 5mL to be made.
PH selectivity micro-electrode of the present utility model, for the effective instrument that provides is provided the pH that measures microcosmos area, this pH selectivity micro-electrode volume is little, most advanced and sophisticated superfine, can realize online, original position, nondestructive mensuration, can be used for studying pH in the various mud of water body, the sediment interior microscopic zone, and in the biological wastewater treatment process, hydrionic concentration change situation in the inner infinitesimal of active sludge or the biological membrane zone, thereby further optimization process technology.
Description of drawings
Fig. 1 is the structural representation of pH selectivity micro-electrode, and label wherein is respectively: 1, cone-shaped glass sleeve pipe; 2, electrolytic solution behind the film; 3, Ag/AgCl silk; 4, epoxy resin; 5, hydrogen ion selective liquid film;
Fig. 2 is the mensuration linear response range figure of pH selectivity micro-electrode.
The utility model is described in further detail below in conjunction with accompanying drawing.
Embodiment
Referring to Fig. 1, pH selectivity micro-electrode of the present utility model comprises a taper outer sleeve pipe 1, and Ag/AgCl silk 3 is installed in this glass tube, the point of taper outer sleeve pipe 1 is marked with hydrogen ion selective liquid film 5, is filled with electrolytic solution 2 behind the film in the chamber of taper outer sleeve pipe 1; With epoxy resin 4 fixedly Ag/AgCl silk and outer glass sleeve pipe.
Taper outer sleeve pipe 1 is a mono-layer tube, and to make tip length be 1～10 μ m.
Electrolytic solution 2 is by the KH of 0.04mol/L behind the film
2PO
4, 0.023mol/L the NaCl of NaOH, 0.015mol/L form (pH is transferred to 7).
This pH selectivity micro-electrode, linear response range are pH=4～10, and slope is-59.945mV/pH.Electrode response time is short, is generally less than 5s, and volume is little, making is simple, cheap.
Above-mentioned pH selectivity micro-electrode follows these steps to preparation:
(1) draw cone-shaped glass sleeve pipe 1: glass tube is fixed on the centre position of heater coil, and heating freely falls it, with the tip of glass tube up, is fixed on the clip again, and heating makes its tip diameter in desired scope once more.
(2) silanization: 30min in the silane agent is immersed at the tip that will draw good cone-shaped glass sleeve pipe in fuming cupboard, is placed in the glass container then and places chamber type electric resistance furnace to toast 1h, make remain on the glass cone-shaped glass sleeve pipe silane agent volatilization fully.
(3) electrolytic solution behind the injection film: electrolytic solution behind the film 2 is injected it respectively in the cone-shaped glass sleeve pipe 1 of silanization with the 1mL syringe behind 0.45 μ m filtering with microporous membrane, and in the pressurization of the rear end of cone-shaped glass sleeve pipe 1, make electrolytic solution be full of cone-shaped glass sleeve pipe (until point), to discharge gas wherein.
(4) suck hydrogen ion selective liquid film (LIX): under binocular microscope, with the tip of syringe with hydrogen ion selective liquid film 5 suction taper glass bushings 1, the liquid film length of suction is about 5mm.
(5) Ag/AgCl silk 3 is inserted behind the films in the electrolytic solution 2 until point near cone-shaped glass sleeve pipe 1, with epoxy resin 4 at the mouth of pipe of cone-shaped glass sleeve pipe fixedly Ag/AgCl silk 3 and sealing cone-shaped glass sleeve pipe 1, and make an end of Ag/AgCl silk 3 expose cone-shaped glass sleeve pipe 1, as indicator electrode.
The preparation process of Ag/AgCl silk 3 is as follows:
1. get a suitably long filamentary silver, with sand papering to remove its surperficial oxide layer;
2. get a precious metal or carbon-point and receive on the negative electrode of power supply, the filamentary silver of polishing is received on the anode of power supply, under the DC voltage of 1.5V, in saturated potassium chloride solution, electroplate 2s and promptly can be made into the Ag/AgCl silk.
Electrolytic solution is the KH of 0.04mol/L behind the above-mentioned film
2PO
4, 0.023mol/L the NaCl of NaOH, 0.015mol/L constitute (pH is transferred to 7).The hydrogen ion selective liquid film is that 0.5g Alamine 304 (tridodecylamine), 0.035g sodium tetraphenylborate (sodium tetraphenylborate) are dissolved in the 5mL2-nitrobenzophenone Octyl Ether (2-nitrophenyl octyl ether) and make.
Calibration curve method is the most frequently used a kind of analytical approach of pH selectivity micro-electrode.The pH selectivity micro-electrode of the utility model preparation adopts calibration curve method, prepares a series of pH value solution with the pH standard buffer solution, measures its potential value respectively, in order to estimate electrode performance.The result shows that the linear response range of this pH selectivity micro-electrode is pH=4～10, and regression coefficient reaches 0.9991, and slope is-59.945mV/pH, as shown in Figure 2.Electrode response time is short, is generally less than 5s.
Claims (3)
1. pH selectivity micro-electrode, comprise a cone-shaped glass sleeve pipe (1), it is characterized in that, electrolytic solution (2) after in the chamber of cone-shaped glass sleeve pipe (1), being filled with film, the point of cone-shaped glass sleeve pipe (1) is marked with hydrogen ion selective liquid film (5), Ag/AgCl silk (3) is installed, at the oral area of cone-shaped glass sleeve pipe (1) epoxy resin (4) fixedly Ag/AgCl silk (3) and sealing cone-shaped glass sleeve pipe (1) in the cone-shaped glass sleeve pipe (1).
2. pH selectivity micro-electrode as claimed in claim 1 is characterized in that, described cone-shaped glass sleeve pipe (1) is a mono-layer tube.
3. pH selectivity micro-electrode as claimed in claim 1 is characterized in that, the tip length of described cone-shaped glass sleeve pipe (1) is 1 μ m～10 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820228432U CN201373863Y (en) | 2008-12-25 | 2008-12-25 | pH selective microelectrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820228432U CN201373863Y (en) | 2008-12-25 | 2008-12-25 | pH selective microelectrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201373863Y true CN201373863Y (en) | 2009-12-30 |
Family
ID=41499948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820228432U Expired - Fee Related CN201373863Y (en) | 2008-12-25 | 2008-12-25 | pH selective microelectrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201373863Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769890A (en) * | 2010-01-22 | 2010-07-07 | 南京星银药业集团有限公司 | Electrochemical ion meter |
| CN101881748A (en) * | 2010-06-30 | 2010-11-10 | 西安建筑科技大学 | Oxidation-reduction potential microelectrode and preparation method thereof |
| CN103852500A (en) * | 2014-01-20 | 2014-06-11 | 四川大学 | Method for measuring pH value of gas in real time by pH electrode |
-
2008
- 2008-12-25 CN CN200820228432U patent/CN201373863Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769890A (en) * | 2010-01-22 | 2010-07-07 | 南京星银药业集团有限公司 | Electrochemical ion meter |
| CN101881748A (en) * | 2010-06-30 | 2010-11-10 | 西安建筑科技大学 | Oxidation-reduction potential microelectrode and preparation method thereof |
| CN103852500A (en) * | 2014-01-20 | 2014-06-11 | 四川大学 | Method for measuring pH value of gas in real time by pH electrode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20111225 |