CN88210970U - Iodinbe detecting instrument - Google Patents
Iodinbe detecting instrument Download PDFInfo
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- CN88210970U CN88210970U CN 88210970 CN88210970U CN88210970U CN 88210970 U CN88210970 U CN 88210970U CN 88210970 CN88210970 CN 88210970 CN 88210970 U CN88210970 U CN 88210970U CN 88210970 U CN88210970 U CN 88210970U
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- iodine
- detecting instrument
- sensor
- electrode
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model relates to an iodine detecting instrument. The iodine detecting instrument is designed according to the parameter transformation technology of the kinetics-electrochemistry in the catalytic system and is mainly composed of a digital voltmeter, a compensator, a sensor, a constant temperature bath, a magnetic stirrer, a delayed relay and a direct current power supply, wherein, the sensor is a composite electrode comprising a glassy carbon outer electrode and an electrode in the noble metal precious metal (such as platinum). The iodine detecting instrument is accompanied by three special solutions. The iodine detecting instrument can automatically measure the trace amount iodine in water on site.
Description
The invention belongs to the catalysis method electrochemical analyser.
At present, a kind of redox catalysis method is all adopted in the analysis of ground underwater trace iodine both at home and abroad, and this method does not see that as yet whole instrument is arranged.Ion-selective electrode can be used for surveying iodine, but its sensitivity and anti-interference are all relatively poor, can not be used for the analysis of trace iodine.
Purpose of the present invention just provides a kind of instrument of special survey iodine, the trace iodine in the on-the-spot fast automatic analysis natural water of its energy.
Iodine analyzer of the present invention is learned according to the catalyst system and catalyzing medium power--the design of electrochemical parameter switch technology.Experiment showed, under certain condition arsenic---cerium redox reaction speed is directly proportional with iodine concentration (I).Its kinetics equation is
dln〔Ce（Ⅳ）〕／dt＝－k
0－K〔Ⅰ〕
K wherein
0Be velocity constant of chemical reaction, K is the catalytic reaction velocity constant,
(Ce(IV)) be ceric concentration.Because of sensor electromotive force E and ln (Ce(IV)) the pass be
E＝E°－sln〔Ce（Ⅳ）〕
S is the electromotive force response slope in the formula, and E ° is constant.To obtain the expression of potential change speed V after the above two formulas combination:
V＝dE／dt＝K
0＋K〔Ⅰ〕
K in the formula
0=k
0S, K=ks.At this moment, potential change speed is directly proportional with iodine concentration.Obviously, after the reaction time, (Δ t) fixed at interval, potential change value Δ E was directly proportional with (I) therebetween, promptly
ΔE＝K
0·Δt＋K·Δt〔Ⅰ〕＝K
0′＋K′〔Ⅰ〕
Because of Δ t is optional, so can adjust Δ t value, make K '=1, the K of this moment
0' be equivalent to " background value "--(I)
0Obtain thus
ΔE＝〔Ⅰ〕＋〔Ⅰ〕
0
In this case, potential change value Δ E equals iodine concentration (ppb) value and adds background value.
Press the designed iodine analyzer of above-mentioned principle as shown in Figure 1, it is made up of institutes such as sensor, compensator, digital voltmeter, delayed relay, calibration cell, magnetic stirring apparatus and indicators, wherein sensor is in the device of temperature control, control speed and control sampling, and inserts the digital voltmeter that has delayed relay through compensator.Like this, the high impedance digital voltmeter of sensor signal input range ± 199.9mv behind 0-200mv compensator deduction background.Holding circuit on the delayed relay control voltage table is finished time-delay sampling (precision is 0.5% relatively) and " freezing " shows.Copper or aluminium matter calibration cell divides A, B, three slotted eyes of C, the thermistor monitoring cell body temperature of bridge-type thermostat in cell body, and the temperature control scope is higher than 5～30 ℃ of room temperatures, and precision is 0.2 ℃.It is 500 ± 25rpm that the adjusting DC voltage makes the magnetic stirring apparatus load speed.Be indicating operating status, be provided with indicators such as heating, constant temperature, measurement, reading, start and stirring.
The structure of sensor as shown in Figure 2, the combination electrode that it is made up of vitreous carbon external electrode and the interior electrode of noble metal (as platinum).Interior electrode and external electrode all go between with the tinsel of overcoat polyethylene pipe.Link up by ceramic diaphragm between the inside and outside electrode.In fill special solution B, be higher than the external electrode electromotive force with the stabilizing potential of electrode in keeping.
The special solution A and the C that all contain fixed volume in addition in the test solution, the effect of A and C is the arsenic (III) formed---advantage such as cerium (IV) redox reaction system has that background value is low, strong interference immunity and transfer linearity are good.
Solution A contains the As(III) 0.1～0.2M, H
2SO
42～4M,
NaCl0.5～2.5M
Solution B contains the Ce(IV) 0.005～0.01M, H
2SO
4
0.5～2M，NaCl0.1～0.5M
Solution C contains the Ce(IV) 0.01～0.04M, H
2SO
4
2～4M。
Among Fig. 2,1 is single stamen shielding line, and 2 is base, 3 is stem, and 4 is filling opening, and 5 are block, 6 is body, and 7 is internal electrode lead-wire (overcoat polyethylene pipe), and 8 are external electrode lead-in wire (overcoat polyethylene pipe), 9 is platinum filament, and 10 is ceramic diaphragm, and 11 is tube head, 12 is the glass carbon plate, 13 is the plug rear end, and 14 is plug body, and 15 is plug head.
Advantage of the present invention is to have modern design, highly sensitive, and compact conformation is simple to operate, easy to carry, can continuous measurement and can " freeze " to show the advantage such as result.
Claims (3)
1, a kind of iodine analyzer that has sensor, it is characterized in that it is made up of institutes such as sensor, compensator, digital voltmeter, delayed relay, calibration cell, magnetic stirring apparatus and indicators, wherein sensor is in the device of temperature control, control speed and control sampling, and pass through compensator and insert the digital voltmeter that has delayed relay, in addition with three kinds of special solution A, B, C.
2, iodine analyzer as claimed in claim 1 is characterized in that the combination electrode that described sensor is made up of vitreous carbon external electrode and the interior electrode of noble metal (as platinum).
3, iodine analyzer as claimed in claim 1 is characterized in that consisting of of described three kinds of special solutions: solution A contains the As(III) 0.1-0.2M, H
2SO
42-4M, NaCl0.5-2.5M; Solution B contains the Ce(IV) 0.005-0.01M, H
2SO
40.5-2M, NaCl0.1-0.5M; Solution C contains the Ce(IV) 0.01-0.04M, H
2SO
42-4M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88210970 CN88210970U (en) | 1988-04-08 | 1988-04-08 | Iodinbe detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88210970 CN88210970U (en) | 1988-04-08 | 1988-04-08 | Iodinbe detecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN88210970U true CN88210970U (en) | 1988-12-14 |
Family
ID=4844424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88210970 Withdrawn CN88210970U (en) | 1988-04-08 | 1988-04-08 | Iodinbe detecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN88210970U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927235A (en) * | 2019-12-11 | 2020-03-27 | 中兴仪器（深圳）有限公司 | On-line analyzer and measuring method for trace iodine |
-
1988
- 1988-04-08 CN CN 88210970 patent/CN88210970U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927235A (en) * | 2019-12-11 | 2020-03-27 | 中兴仪器（深圳）有限公司 | On-line analyzer and measuring method for trace iodine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |