CN1226616C - Selenium ion selective electrode - Google Patents
Selenium ion selective electrode Download PDFInfo
- Publication number
- CN1226616C CN1226616C CN 200410012114 CN200410012114A CN1226616C CN 1226616 C CN1226616 C CN 1226616C CN 200410012114 CN200410012114 CN 200410012114 CN 200410012114 A CN200410012114 A CN 200410012114A CN 1226616 C CN1226616 C CN 1226616C
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- electrode
- selenium
- sensitive film
- silver
- shielded
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Abstract
The present invention discloses a selenium ion selective electrode which comprises an electrode body, a sensitive film, a silver wire, a shielded conductor, a shielded plug and a seal washer, wherein the electrode body is composed of an electrode cap, an electrode rod and an electrode head, the sensitive film is embedded in the electrode head, the seal washer is arranged between the electrode rod and the electrode head, the silver wire directly contacts the inner side of the sensitive film and is connected with the shielded conductor by a platinum wire, and silver selenide is used as the sensitive material to prepare the sensitive film. The present invention has the advantages of favorable stability and favorable repeatability. When the electrode carries out measurement continuously for 2 hours, the electrode drift is lower than 4MV. The electrode has long service life.
Description
Technical field
The present invention relates to a kind of electrodes selective of measuring plasma selenium.
Background technology
Selenium adopts methods such as spectrophotometric method, fluorophotometric method, atomic absorption spectrography (AAS) to measure usually.Spectrophotometric method is to add 3 in containing the solution of selenium, and 3-diaminobenzidine developer makes it and Se
4+Generate yellow complex, behind organic solvent extraction, use the spectrophotometry solution absorbency again, and then determine the content of selenium in the sample to be tested.The method of this mensuration selenium is lower because of its sensitivity, can only be used for the mensuration of high content component, and agents useful for same price height, and consumption is big, and toxicity is higher; The fluorophotometric method is with 2, and the 3-diaminonaphthalene is a fluorescent reagent, by measuring and Se
4+The size of the fluorescent material fluorescence intensity that generates, the mensuration of selenium in the realization sample, this method sensitivity is higher, but the agents useful for same less stable, the price height, treatment step is loaded down with trivial details, finding speed is slow and can not realize on-line automatic analysis.The development of relevant plasma selenium electrodes selective also has report, and it is based on Se
4+With diaminobenzidine or 2, it is that sensitive material is made the PVC film that the 3-diaminonaphthalene forms the coordination compound that is insoluble in water, is fixed on electrode tip, constitutes the plasma selenium electrodes selective jointly with internal reference electrode and interior reference solution.This class electrode response be Se in the solution
4+Ion, its sensitivity is lower, be difficult to satisfy the demand that microcomponent is measured, and the serviceable life of electrode is generally shorter.
Summary of the invention
The invention provides a kind of plasma selenium-electrodes selective, to realize the fast measuring of selenium with good reproduction, stability, selectivity and long service life.
The technical solution adopted in the present invention is: a kind of plasma selenium electrodes selective, comprise the electrode body of forming by electrode cap, electrode stem and electrode tip, the sensitive membrane of intercalation electrode head, filamentary silver, shielded conductor and shielded plug, filamentary silver directly contacts with sensitive membrane is inboard, and be connected with shielded conductor by platinum filament, sensitive membrane is be sensitive material with the silver selenide through grind, sieve, compressing tablet forms, with binder with in its tight intercalation electrode head.
Between electrode stem and electrode tip, be provided with packing washer.
Direct and the interior side contacts of sensitive membrane of filamentary silver on the electrode stem, the film potential of generation passes to shielded conductor and shielded plug by filamentary silver, platinum filament, and electrode stem adopts with electrode tip and is threaded, and can realize the replacing of sensitive membrane easily.Adopt this solid material of silver selenide to make sensitive membrane, reduced electrode impedance, thereby obtained good stable, reappearance, electrode METHOD FOR CONTINUOUS DETERMINATION 2 hours, drift electrode is less than 4mV, and electrode life is long.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a cut-open view of the present invention.
Embodiment
As Fig. 1, shown in Figure 2, plasma selenium electrodes selective of the present invention, comprise by electrode cap 2, the electrode body that electrode stem 3 and electrode tip 6 are formed, the sensitive membrane 7 of intercalation electrode head 6 is that the indissoluble thing silver selenide with selenium is a sensitive material, through grinding, sieve, compressing tablet forms, with binder with in its tight intercalation electrode head 6, filamentary silver 4 direct and sensitive membrane 7 interior side contacts in the electrode stem 3, the film potential that produces is by filamentary silver 4, platinum filament 9 passes to shielded conductor 1 and shielded plug 8, electrode stem 3 adopts with electrode tip 6 and is threaded, can realize the replacing of sensitive membrane easily, be provided with packing washer 5 at connection of thread.Plasma selenium electrodes selective of the present invention should carry out activation processing before using, promptly with abrasive paper for metallograph with the sensitive membrane surface finish, shielded plug is directly received potentiometric input end, and connect the external biliquid of saturated potassium nitrate agar bridge and connect mercurous chloride electrode, in deionized water, obtain stable potential, be placed on then and obtain equilibrium potential in the alkaline solution, can use more than two months through the electrode after handling like this, when performance changes such as the range of linearity narrows down, sensitivity reduces and can carry out above-mentioned processing again and can continue again to use.
Because that electrode response of the present invention is Se in the solution
2-Concentration, and in the solution selenium exist form varied, therefore, need the selenium of various forms to be converted into hydrogen selenide, with alkaline solution the hydrogen selenide that produces is absorbed then and carry out potential measurement again, like this by means of hydride generator, selenium was separated with matrix, the elimination matrix disturbs, and can make selenium obtain enrichment again, thereby improves sensitivity and the accuracy of measuring.
The design is sensitive material with the silver selenide, make solid electrode through grind, sieve, compressing tablet etc., put it in the solion to be measured after the activated processing of electrode, according to its principle of work, the electrode potential value that this electrode produced is observed nernst equation within the specific limits with the activity for the treatment of measured ion, that is:
Therefore, the plasma selenium electrodes selective has following characteristics:
(1) selenium in the sample is converted into hydrogen selenide by hydride generator, feeds nitrogen the hydrogen selenide that produces is directed in the alkaline absorption solution, measure Se in the absorption liquid
2-Concentration, electrode pair Se
2-5 * 10
-7～10
-4Mol.L
-1Be linear response in the concentration range, the slope of working curve is 27.3mV/dcc, detects down and is limited to 1 * 10
-7Mol.L
-1
(2) adopt solid material to make sensitive membrane, reduced electrode impedance, thereby obtained good stable, reappearance, electrode METHOD FOR CONTINUOUS DETERMINATION 2 hours, drift electrode is less than 4mV, and electrode life is long.
(3) the common negative ion of electrode pair has good selectivity, Na
+, K
+, Ca
2+, Mg
2+, Cl
-, SO
4 2-, NO
3 2-Deng common ion determination of electrode all there is not obvious interference.
This shows, the present invention has overcome the defective of PVC film plasma selenium electrodes selective, good stable, selectivity and reappearance have been obtained, and have long serviceable life, can be used for the analysis and the mensuration of environmental science, life science and field Se contents such as clinical medicine, Food Science.
Claims (2)
1, a kind of plasma selenium electrodes selective, comprise the electrode body of forming by electrode cap (2), electrode stem (3) and electrode tip (6), the sensitive membrane (7) of intercalation electrode head (6), filamentary silver (4), shielded conductor (1) and shielded plug (8), filamentary silver (4) directly contacts with sensitive membrane (7) inboard, and be connected with shielded conductor (1) by platinum filament (9), it is characterized in that: described sensitive membrane (7) is to be that sensitive material is made with the silver selenide.
2, plasma selenium electrodes selective according to claim 1 is characterized in that: be provided with packing washer (5) between electrode stem (3) and electrode tip (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410012114 CN1226616C (en) | 2004-01-14 | 2004-01-14 | Selenium ion selective electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410012114 CN1226616C (en) | 2004-01-14 | 2004-01-14 | Selenium ion selective electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558223A CN1558223A (en) | 2004-12-29 |
| CN1226616C true CN1226616C (en) | 2005-11-09 |
Family
ID=34350949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410012114 Expired - Fee Related CN1226616C (en) | 2004-01-14 | 2004-01-14 | Selenium ion selective electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1226616C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149357B (en) * | 2007-11-06 | 2010-11-24 | 苏州大学 | Selenium content detection method |
| TWI452289B (en) * | 2011-09-06 | 2014-09-11 | Univ Nat Sun Yat Sen | Recycling method of integral type ion selective electrode |
| CN103196971A (en) * | 2013-03-28 | 2013-07-10 | 浙江大学 | Preparation method of solid phosphate ion electrode based on aluminum and aluminum phosphate |
-
2004
- 2004-01-14 CN CN 200410012114 patent/CN1226616C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1558223A (en) | 2004-12-29 |
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