CN107860803A - A kind of solid-state phosphate anion selection electrode based on chromium silk, preparation method and application - Google Patents
A kind of solid-state phosphate anion selection electrode based on chromium silk, preparation method and application Download PDFInfo
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Abstract
A kind of solid-state phosphate anion selection electrode based on chromium silk; including electrode body; electrode body is the entirety for eletrode tip, electrode bar and electrode the tail end composition being made using chromium silk; electrode tail end is connected with the fine copper with wiring fork and tests wire; high temperature resistant electrode protection set is arranged with outside electrode bar, separation layer is filled between high temperature resistant electrode protection set and electrode bar.A kind of solid-state phosphate anion based on chromium silk provided by the invention selects electrode, preparation method and application, can solve the deficiency of existing solid-state phosphate anion selection electrode, detectable concentration scope is wide, high sensitivity, the response time is shorter, stability is strong, selectivity is good, strong antijamming capability, favorable reproducibility, long lifespan.
Description
Technical field
The present invention relates to electrochemical sensor technology field, especially a kind of solid-state phosphate anion selection based on chromium silk
Electrode, preparation method and application.
Background technology
In recent years, as the powerful development of China, many chemical enterprises develop also very rapid.Economy-zone to China
While carrying out rapid growth, many enterprise's sewage treatment works do not in place, and production waste is directly discharged into the phenomenon of rivers
Happen occasionally, along with a large amount of uses of agricultural chemicals, cause many more rivers body eutrophications of need very serious.Body eutrophication
Direct result be exactly algal bloom, there is wawter bloom, and then water quality is continuous worsening, the content of phosphorus is significantly exceeded, ecological ring
Border is by serious destruction.Therefore, the content of phosphorus turns into an important indicator of water quality detection.
The phosphatic method of the traditional detection in China at present is P-Mo blue AAS, and the principle of this method is with strong oxygen
By the phosphorus of different shape in water sample to be measured, all oxidation resolution into orthophosphates, adds ascorbic acid, ammonium molybdate, meeting is anti-to agent
The P-Mo blue complex compound of blueness should be generated, the absorbance of solution is detected with spectrophotometer afterwards, is extrapolated always according to absorbance
The content of phosphorus.This method belongs to optical means, is easily disturbed by other material, and the response time is slower, it is impossible to
Outdoor in situ detection.The chromatography of ions can also detect the content of phosphorus, but this method can only detect low concentration, and detect
Cost is very high.
Ion-selective electrode need not add chemical reagent, and secondary pollution will not be caused to water body, and testing cost is low, response
Time is short, measurement concentration range is wide, can carry out in-situ monitoring.Therefore, ion-selective electrode is in environment, chemical industry, life science
In field, detection phosphorus acid ion concentration has great practical value.
Current ion-selective electrode has solid ionic selection electrode, liquid ion-selective electrode, biological ion selection electricity
Pole.The film of liquid ion-selective electrode is easy to damage, and selectivity is nor very well.Biological ion selection electrode needs
Testing conditions are very gentle, and the life-span is very short.Current solid ionic selection electrode is all based on cobalt silk mostly, although selection
Property, stability, reappearance it is all relatively good, but detect concentration range it is very low, and every time detect before be required for aoxidizing, compare
Trouble.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of solid-state phosphate anion selection electrode based on chromium silk, system
Preparation Method and application, can solve the deficiency of existing solid-state phosphate anion selection electrode, detectable concentration scope is wide, sensitivity
Height, the response time is shorter, stability is strong, selectivity is good, strong antijamming capability, favorable reproducibility, long lifespan.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of solid-state phosphate radical based on chromium silk
Ion-selective electrode, including electrode body, electrode body are eletrode tip, electrode bar and the electrode tail end group being made using chromium silk
Into entirety, electrode tail end is connected with the wire with wiring fork, high temperature resistant electrode protection set, high temperature resistant electricity is arranged with outside electrode bar
Separation layer is filled between pole protective case and electrode bar.
Chromium silk used in electrode body is the chromium silk that purity is 99.99%.
Wire is made up of copper content for 99% wire stylet and the insulation protective jacket outside wire stylet.
High temperature resistant electrode protection set is not less than 1200 degrees Celsius of high-temperature fibre glass tube for fusing point.
A kind of preparation method of the above-mentioned solid-state phosphate anion selection electrode based on chromium silk, this method include following step
Suddenly：
Step 1：One end of chromium silk is polished to form eletrode tip, then will be washed with deionized water after eletrode tip polishing light
Only, the chromium silk after polishing is made；
Step 2：Chromium silk after polishing is loaded in high temperature resistant electrode protection set, exposes eletrode tip and electrode tail end；
Step 3：With scolding tin connection electrode tail end and wire, interior injection AB structure glue shapes are covered toward high temperature resistant electrode protection afterwards
Into separation layer；
Step 4：The finished product that step 3 is obtained is positioned over ventilation and treats its naturally dry, that is, is made described based on chromium silk
Solid-state phosphate anion selects electrode.
Above-mentioned solid-state phosphate anion selection electrode hydrogen radical ion concentration of phosphoric acid one in water body is detected based on chromium silk
Using.
A kind of solid-state phosphate anion based on chromium silk provided by the invention selects electrode, preparation method and application, detection
Concentration range is big, is 10-6-10-1mol/L；Response time is short, within 60s；Stability is strong, each dense within 24 hours
Potential error corresponding to degree is no more than 3mv；Selectivity is good, very high to the selectivity of the hydrogen radical of phosphoric acid one；Strong antijamming capability；Reappear
Property it is good, survey a current potential every 2 hours, deviation is no more than 2mv；Long lifespan, it can be used and be up to 4 months as long as.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is the structural representation of ion-selective electrode of the present invention；
Fig. 2 is the enlarged drawing of the end construction of ion-selective electrode of the present invention；
Fig. 3 is the resonse characteristic that the intermediate ion of the embodiment of the present invention three selects the hydrogen radical of electrode pair phosphoric acid one；
Fig. 4 is 10 in the embodiment of the present invention three-2Stood after obtaining stable potential value in mol/L potassium phosphate,monobasic solution
7200s potential value and the curve map of time；
Fig. 5 is 10 in the embodiment of the present invention three-3Measured again every 2 hours in mol/L potassium phosphate,monobasic solution
The curve map of potential value and number.
Embodiment
Embodiment one
A kind of solid-state phosphate anion selection electrode based on chromium silk, including electrode body, electrode body are to be made using chromium silk
The entirety that eletrode tip 1, electrode bar 2 and the electrode tail end 3 formed forms, electrode tail end 3 are connected with the wire 4 with wiring fork 5,
High temperature resistant electrode protection set 6 is arranged with outside electrode bar 2, AB structure glues are filled between high temperature resistant electrode protection set 6 and electrode bar 2
Layer forms separation layer 7.
Chromium silk used in electrode body is the chromium silk that purity is 99.99%.
Wire 4 is made up of copper content for 99% wire stylet and the insulation protective jacket outside wire stylet.
High temperature resistant electrode protection set 6 is the high-temperature fibre glass tube that fusing point is not less than 1200 degrees Celsius.
Embodiment two
A kind of preparation method of the above-mentioned solid-state phosphate anion selection electrode based on chromium silk, this method include following step
Suddenly：
Step 1：It is 99.99% clean chromium silk 3cm to take a diameter of 1mm, purity, and one end of chromium silk is polished to form electrode
Tip 1, then eletrode tip 1 polished and is washed with deionized water after light net, the chromium silk after polishing is made；
Step 2：Chromium silk is first polished with Mei Naite technical grade speed governing electric mill, then it is bright with 2500# sand paper polishing, spend
Ionized water is cleaned, then the chromium silk after polishing is loaded in high temperature resistant electrode protection set 6, exposes 7mm eletrode tips 1 and 3mm electrodes
Tail end 3；
Step 3：The scolding tin connection electrode tail end 3 and wire 4 burnt with electric iron, afterwards toward high temperature resistant electrode protection set 6
Interior injection AB structure glues form separation layer 7；
Step 4：The finished product that step 3 is obtained is positioned over ventilation and treats its naturally dry, that is, is made described based on chromium silk
Solid-state phosphate anion selects electrode.
Every time before measurement, it is placed in the potassium dihydrogen phosphate that concentration is 0.01mol/L and activates 20h, and survey every time
It will be rinsed well before and after amount with deionized water.Or electrode can be put into the beaker for filling deionized water, beaker is put
Enter in ultrasonic cleaner and clean 12 minutes.
Embodiment three
Above-mentioned solid-state phosphate anion selection electrode hydrogen radical ion concentration of phosphoric acid one in water body is detected based on chromium silk
Using.
It is a kind of using above-mentioned ion-selective electrode detect the hydrogen radical of phosphoric acid one relative to reference electrode potential value the step of, should
Step is：
Step 1：Electrode activation：Before measurement, ion-selective electrode is placed on the phosphoric acid that concentration is 0.001-0.1mol/L
20-24 hours are activated in dihydro potassium solution, then are rinsed well with deionized water；
Step 2：Prepare potassium phosphate,monobasic standard liquid：1.7418g potassium phosphate,monobasic powder is weighed with electronic balance, by the powder
End is dissolved in distilled water, then resulting solution is poured into 100ml volumetric flasks, constant volume, can obtain concentration as 10-1Mol/L phosphoric acid one
Hydrogen potassium standard liquid；Take 10-1Mol/L potassium phosphate,monobasic standard liquid 10ml, is diluted with water 100ml, constant volume, can obtain 10-2Mol/L's
Potassium phosphate,monobasic standard liquid；So go on, can obtain 10-6-10-1Mol/L potassium phosphate,monobasic standard liquid.
Step 3：Adjust the pH value of standard liquid solution：There is lot of documents to show, pH value can have an impact to measurement potential value, therefore
In order to follow the principle of unitary variant, with sodium hydroxide or watery hydrochloric acid by 10-6-10-1The pH value of mol/L every kind of standard liquid is complete
It is transferred to 10 (under conditions of pH=10, all hydrogen radicals of phosphoric acid one of the existence form of phosphate anion in standard liquid) in portion；
Step 4：Record potential value corresponding to the hydrogen radical of phosphoric acid one under every kind of concentration：The ion-selective electrode that step 1 is obtained
It is that reference electrode carries out potentiometric detection as working electrode, AgCl/Ag electrodes；Using CHI604E types electrochemical workstation or
Person's CS2350 types double potentiostat is respectively to from 10-6-10-1Ion-selective electrode in mol/L each standard liquid relative to
The potential value of reference electrode measures, and records respectively from 10-6-10-1The stable potential value obtained under each concentration of mol/L, often
It is secondary detected after a kind of concentration will with deionized water by the surface clean of used working electrode and reference electrode do
Only, then dried up with hair-dryer, can just carry out the measurement of next concentration potential value；
Step 5：Draw a diagram：All after measurement, arrange every kind of concentration it is corresponding under stable potential value, using concentration as
Abscissa, potential value corresponding to the hydrogen radical ion of phosphoric acid one of various concentrations are the response that ordinate draws the hydrogen radical of electrode pair phosphoric acid one
Characteristic curve, as shown in Figure 3.
As shown in figure 3, according to the response curve drawn, it is known that the present embodiment phosphate anion selects the linear model of electrode
Enclose is 10-6-10-1Mol/L, slope are -27.043mV/dec, and resulting ion-selective electrode is opened relative to reference electrode
Road voltage and the equation of the hydrogen radical concentration of phosphoric acid one are
Y=-27.043 (lgC) -325.42, i.e. Y=-27.043X-325.42, the coefficient R of the equation2It is worth and is
0.9896, in formula, C is the concentration of the hydrogen radical of phosphoric acid one, and X is the common logarithm value of the hydrogen radical concentration of phosphoric acid one, and Y is the different hydrogen of phosphoric acid one
Phosphate anion under root concentration is corresponding selects potential value of the electrode relative to reference electrode.
The coefficient R of the equation2The value of value is very high, and the ion-selective electrode obtained by showing is relative to reference electrode
Both open-circuit voltage values and the hydrogen radical concentration of phosphoric acid one correlation is fine, it can be said that the property of bright obtained ion-selective electrode
Can be very well.
In order to further probe into other performances of ion-selective electrode, such as stability, reappearance and response time, pass through
Test below to probe into these performances.
Probe into stability：Stability, refer herein within a very long time, obtained ion-selective electrode is relative to ginseng
Open-circuit voltage than the stabilization of electrode substantially will not change or vary less.Using resulting ion-selective electrode as work
Make electrode, AgCl/Ag electrodes are that reference electrode carries out potentiometric detection；Using the electrochemical workstation of Shanghai Chen Hua CHI604E types
Or CS2350 types double potentiostat is to from 10-2Ion-selective electrode in mol/L potassium phosphate,monobasic standard liquid is relative to reference electricity
The potential value of pole measures, and elects detection function as OCP-time, sets sweep time as 7200s.Measurement finishes
Afterwards, 10 are recorded-2The OCP value of the stabilization obtained under mol/L concentration, draws curve as shown in Figure 4, can be seen by Fig. 4
Go out, it is resulting when ion-selective electrode reaches stable relative to the potential value of reference electrode and then continues to scan on 7200s
OCP value is all no more than 3mV in -279mV or so, maximum and minimum value deviation, it is seen that prepared ion-selective electrode
Stability it is fine.
Probe into reappearance：Reappearance, herein refer to ion-selective electrode inserting 10-3Obtained in mol/L standard liquids
After stable potential, then ion-selective electrode and working electrode taken up from solution cleaned up with deionized water after with blowing
Blower fan dries up, and spends 2 hours, ion-selective electrode and reference electrode then are put into 10 again-3Electricity is carried out in mol/L standard liquids
Position measurement.So it is repeated several times, obtained stable potential value and experiment number is drawn into curve, as seen from Figure 5, measured
6 times in, resulting stable potential value fluctuates in -243mV or so, and fluctuation is no more than 2mV, it is seen that prepared ion selects
Electrode reappearance is fine.
Probe into the response time：According to can this spy response in the response time definition：Response time refers to working electrode and ginseng
During than electrode contact measured solution, ion-selective electrode is stablized relative to the current potential of reference electrode from the unstable of beginning to trend
The time undergone, or reach time required for 95% stable potential for current potential.Every time a concentration is finished in measurement
Afterwards, can be obtained for recording on the software of electrochemical workstation experimental data in the width writing scan 720s times, often
The potential-time curve figure of potential value corresponding to second, according to the definition of response time, the song that can be depicted according to software
Line and data are determined below this concentration, the response time of ion-selective electrode, according to measurement result, are obtained under every kind of concentration
Response time it is as shown in table 1, as can be seen from Table 1, the response time under all concentration is all within 60s, it is seen that is prepared into
The ion-selective electrode response time arrived is shorter, has good performance.
Table 1
Example IV
Detection method is：Prepared ion-selective electrode is applied into actual water body detection, some water to be measured can be taken
Sample, by testing sample according to above-mentioned detecting step, water sample intermediate ion selection electrode may finally be obtained relative to reference electricity
The stable potential value of pole, further according to the response curve of each phosphate anion of drafting, potential value is brought into corresponding equation, i.e.,
The phosphatic concentration of the water sample can be calculated.
Claims (6)
1. a kind of solid-state phosphate anion selection electrode based on chromium silk, including electrode body, it is characterised in that：Electrode body is use
The eletrode tip that chromium silk is made（1）, electrode bar（2）With electrode tail end（3）The entirety of composition, electrode tail end（3）It is connected with
Band wiring is pitched（5）Wire（4）, electrode bar（2）It is arranged with high temperature resistant electrode protection set outside（6）, high temperature resistant electrode protection set（6）
And electrode bar（2）Between be filled with separation layer（7）.
A kind of 2. solid-state phosphate anion selection electrode based on chromium silk according to claim 1, it is characterised in that：Electrode
Chromium silk used in body is the chromium silk that purity is 99.99%.
A kind of 3. solid-state phosphate anion selection electrode based on chromium silk according to claim 1, it is characterised in that：Wire
（4）It is made up of wire stylet and the insulation protective jacket outside wire stylet that copper content is 99%.
A kind of 4. solid-state phosphate anion selection electrode based on chromium silk according to claim 1, it is characterised in that：Resistance to height
Warm electrode protection set（6）It is not less than 1200 degrees Celsius of high-temperature fibre glass tube for fusing point.
A kind of 5. preparation of the selection electrode of the solid-state phosphate anion based on chromium silk any one of the claims 1-4
Method, it is characterised in that this method comprises the following steps：
Step 1：One end of chromium silk is polished to form eletrode tip（1）, then by eletrode tip（1）Deionized water is used after polishing is bright
Clean, the chromium silk after polishing is made；
Step 2：Chromium silk after polishing is loaded into high temperature resistant electrode protection set（6）It is interior, expose eletrode tip（1）With electrode tail end
（3）；
Step 3：With scolding tin connection electrode tail end（3）And wire（4）, afterwards toward high temperature resistant electrode protection set（6）Interior injection AB knots
Structure glue forms separation layer（7）；
Step 4：The finished product that step 3 is obtained is positioned over ventilation and treats its naturally dry, that is, the solid-state based on chromium silk is made
Phosphate anion selects electrode.
6. the selection electrode of the solid-state phosphate anion based on chromium silk any one of the claims 1-4 is in detection water body
The application of the middle hydrogen radical ion concentration of phosphoric acid one.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109745652A (en) * | 2019-01-18 | 2019-05-14 | 扬州大学 | The method and its miniaturized devices of immobilized microorganism degrading organic phosphor and application |
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| CN1098502A (en) * | 1993-08-06 | 1995-02-08 | 湖南大学 | Phosphoric acid radical ion-selective electrode and uses thereof |
| CN1147031A (en) * | 1995-03-29 | 1997-04-09 | 川崎制铁株式会社 | Electrolytic chromate solution for galvanized sheet steel and method for processing galvanized sheet steel with it |
| US20020043459A1 (en) * | 2000-09-13 | 2002-04-18 | Horiba, Ltd. | Phosphate ion selective electrode and manufacturing method thereof |
| CN2870188Y (en) * | 2005-10-10 | 2007-02-14 | 刘孝伟 | Mini-tube-type sealed colloid lead-acid accumulator |
| CN105319258A (en) * | 2014-07-08 | 2016-02-10 | 宝山钢铁股份有限公司 | Method for determining quality of chromium oxide coating in chromium electroplated plate |
| JP2016042032A (en) * | 2014-08-14 | 2016-03-31 | ニプロ株式会社 | Glucose sensor |
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- 2017-10-25 CN CN201711009742.0A patent/CN107860803B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05126794A (en) * | 1991-11-05 | 1993-05-21 | Agency Of Ind Science & Technol | Measuring method for acidity and alkalinity |
| CN1098502A (en) * | 1993-08-06 | 1995-02-08 | 湖南大学 | Phosphoric acid radical ion-selective electrode and uses thereof |
| CN1147031A (en) * | 1995-03-29 | 1997-04-09 | 川崎制铁株式会社 | Electrolytic chromate solution for galvanized sheet steel and method for processing galvanized sheet steel with it |
| US20020043459A1 (en) * | 2000-09-13 | 2002-04-18 | Horiba, Ltd. | Phosphate ion selective electrode and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109745652A (en) * | 2019-01-18 | 2019-05-14 | 扬州大学 | The method and its miniaturized devices of immobilized microorganism degrading organic phosphor and application |
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