US4810351A
Expired / Lapsed
US
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Carbonate selective membrane and electrode
Assignee: Bayer Corp
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Filing: 1987-06-01
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Granted: 1989-03-07
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Expires: 2007-06-01
Abstract
Abstract The carbonate ion selective membrane of the invention comprises (a) a polymeric inert support material; (b) a plasticizer effective to solubilize the support material; (c) a quaternary ammonium ion; (d) an ionophore which is preferentially reactive with carbonate ions; and (e) a hydrophobic molecule effective to exclude ions other than carbonate ions. The addition of a hydrophobic molecule to the membrane formulation serves two purposes. First, it assists in the "binding" of the organic constituents to the matrix. Second, it repels charged species, i.e., anions and cations, from the solution phase, thereby improving selectivity to the carbonate species which enters the membrane via selective complexation with the ionophore. The quaternary ammonium ion is preferably a C 7 to C 9 quaternary ammonium ion. In this case, the plasticizer is selected to be one effective to maximize the binding of carbonate ions with the C 7 C 9 quaternary ammonium ions. The invention further provides a carbonate ion selective electrode comprising an internal reference element in electrochemical contact with the membrane described above.
Inventors
- 👤 Eddy Chapoteau
- 👤 W. James Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:39
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
100 words
A carbonate ion-selective membrane for use in a continuous flow analytical system comprising: (a) a dimensionally stable polymeric inert support material having dispersed therein: (i) a plasticizer effective to solubilize said support material; (ii) ion exchange means in the form of tetra-C 7 -C 9 quarternary ammonium ions; (iii) an ionophore in the form of a higher alkyl-substituted fluoroacetophenone preferentially reactive with carbonate ions; and additionally (iv) a substance having hydrophobic a molecule effective to exclude ions other than carbonate ions, said molecule being selected from the group consisting of a 1-phenyldecane, a diphenyl ether, a dodecane and a butylbeuzene.
Claim 2
Dependent Claim
100 words
A carbonate ion-selective membrane for use in a continuous flow analytical system comprising: (a) a dimensionally stable polymeric inert support material having dispersed therein: (i) a plasticizer effective to solubilize said support material; (ii) ion exchange means in the form of tetra-C 7 -C 9 quarternary ammonium ions; (iii) an ionophore in the form of a higher alkyl-substituted fluoroacetophenone preferentially reactive with carbonate ions; and additionally (iv) a substance having hydrophobic a molecule effective to exclude ions other than carbonate ions, said molecule being selected from the group consisting of a 1-phenyldecane, a diphenyl ether, a dodecane and a butylbeuzene.
Claim 3
Dependent Claim
18 words
The membrane of claim 1 wherein the dimensionally stable polymeric inert support material is a vinyl chloride polymer.
Claim 4
Dependent Claim
15 words
The membrane of claim 2 wherein the vinyl chloride polymer is a vinyl chloride homopolymer.
Claim 5
Dependent Claim
17 words
The membrane of claim 3 wherein the polymer is a very high molecular weight poly (vinyl chloride).
Claim 6
Dependent Claim
11 words
The membrane of claim 1 wherein the plasticizer is an adipate.
Claim 7
Dependent Claim
11 words
The membrane of claim 5 wherein the adipate is di-(2-ethylhexyl) adipate.
Claim 8
Dependent Claim
29 words
The membrane of claim 1 wherein the plasticizer is selected from those effective to maximize the binding of carbonate ions with said C 7 -C 9 quaternary ammonium ion.
Claim 9
Dependent Claim
14 words
The membrane of claim 1 wherein the fluoroacetophynenone is a para-substituted higher alkyl fluoroacetephenone.
Claim 10
Dependent Claim
14 words
The membrane of claim 1 wherein the ionophore is an orthosubstituted higher alkyl fluoroacetophenone.
Claim 11
Dependent Claim
17 words
The membrane of claim 1 wherein the higher alkyl fluoroacetophenone is a C 10 -C 20 fluoroacetophenone.
Claim 12
Dependent Claim
17 words
The membrane of claim 10 wherein the fluoroacetophenone is selected from the group consisting of alpha-substituted trifluoroacetophenones.
Claim 13
Dependent Claim
18 words
The membrane of claim 1 wherein the C 7 -C 9 quaternary ammonium ion is tetra-n-octyl quaternary ammonium.
Claim 14
Dependent Claim
24 words
The membrane of claim 1 wherein the hydrophobic molecule effective to exclude ions other than carbonate ion is at least a C 10 molecule.
Claim 15
Dependent Claim
12 words
The membrane of claim 13 wherein the hydrophobic molecule is a 1-phenyldecane.
Claim 16
Dependent Claim
13 words
The membrane of claim 13 wherein the hydrophobic molecule is a diphenyl ether.
Claim 17
Dependent Claim
12 words
The membrane of claim 13 wherein the hydrophobic molecule is a dodecane.
Claim 18
Dependent Claim
12 words
The membrane of claim 13 wherein the hydrophobic molecule is a butylbenzene.
Claim 19
Dependent Claim
18 words
A carbonate ion-selective electrode comprising an internal reference component in electrochemical contact with the membrane of claim 1.
Claim 20
Dependent Claim
23 words
The electrode of claim 18 which further comprises an internal electrolyte solution in fluid contact between said internal reference component and said membrane.
Claim 21
Dependent Claim
15 words
The electrode of claim 18 wherein the internal reference component is of an electroconductive material.
Claim 22
Dependent Claim
20 words
The electrode of claim 20 wherein the electroconductive material is of silver, gold, platinum, mercury or amalgams or mixtures thereof.
Claim 23
Dependent Claim
26 words
The electrode of claim 20 wherein the internal reference component is a silver structure of which at least a part is coated with a silver halide.
Claim 24
Dependent Claim
23 words
The electrode of claim 18 wherein the internal reference element is a pellet comprising silver chloride, silver sulfide, mercuric chloride or mercuric sulfide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |