US4892640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensor for the determination of electrolyte concentrations
Assignee: Avl AG
•
Filing: 1988-07-12
•
Granted: 1990-01-09
•
Expires: 2008-07-12
Abstract
Abstract An ion-selective electrode for determining an electrolyte concentration in an aqueous solution includes an ion-selective layer and a potential-sensitive fluorescent indicator in the ion-selective layer, the fluorescence intensity of the potential-sensitive fluorescent indicator being measured to provide an indication of the electrolyte concentration.
Inventors
- 👤 Otto S. Wolfbeis
- 👤 Petra Braun geb. Hochmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:50
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
129 words
A sensor for determining the concentration of an electrolyte in an aqueous sample solution, said sensor comprising an ion-selective membrane which contains valinomycin as an ion-carrier material and which has a first side that can be brought into contact with an electrolyte-containing aqueous sample solution, and a potential-sensitive fluorescent indicator immobilized at said first side of said ion-selective membrane, said fluorescent indicator, when excited, emitting fluorescence having an intensity which is dependent on a potential difference which arises at the boundary surface between said ion-selective membrane and said electrolyte-containing aqueous sample solution due to ion transport from said sample solution into said ion-selective membrane at said boundary surface by means of said ion-carrier material, said fluorescence intensity corresponding to the concentration of electrolyte in the electrolyte-containing aqueous sample solution.
Claim 2
Dependent Claim
129 words
A sensor for determining the concentration of an electrolyte in an aqueous sample solution, said sensor comprising an ion-selective membrane which contains valinomycin as an ion-carrier material and which has a first side that can be brought into contact with an electrolyte-containing aqueous sample solution, and a potential-sensitive fluorescent indicator immobilized at said first side of said ion-selective membrane, said fluorescent indicator, when excited, emitting fluorescence having an intensity which is dependent on a potential difference which arises at the boundary surface between said ion-selective membrane and said electrolyte-containing aqueous sample solution due to ion transport from said sample solution into said ion-selective membrane at said boundary surface by means of said ion-carrier material, said fluorescence intensity corresponding to the concentration of electrolyte in the electrolyte-containing aqueous sample solution.
Claim 3
Dependent Claim
31 words
A sensor according to claim 1, wherein said ionselective membrane includes a second side, and wherein said sensor includes a transparent carrier plate supporting said second side of said ion-selective membrane.
Claim 4
Dependent Claim
14 words
A sensor according to claim 2, wherein said transparent plate is composed of glass.
Claim 5
Dependent Claim
39 words
A sensor according to claim 1, wherein said ionselective membrane includes a second side which is opposite to said first side, and including a light conductor having an end in contact with said second side of said ion-selective membrane.
Claim 6
Dependent Claim
14 words
A sensor according to claim 4, wherein said light conductor is an optical fiber.
Claim 7
Dependent Claim
14 words
A sensor according to claim 4, wherein said potential-sensitive fluorescent indicator is rhodamine B.
Claim 8
Dependent Claim
45 words
A sensor according to claim 4, wherein said ion-selective membrane comprises a polymer membrane having a first side that can be brought into contact with an electrolyte-containing aqueous sample solution, and wherein said ion-carrier material is located at said first side of said polymer membrane.
Claim 9
Dependent Claim
130 words
A sensor for determining the concentration of an electrolyte in an aqueous sample solution, said sensor comprising an ion-selective membrane which contains N,N'-bibenzyl-N,N'-diphenyl-1, 2-phenylenedioxide-diacetamide as an ion-carrier material and which has a first side that can be brought into contact with an electrolyte-containing aqueous sample solution, and a potential-sensitive fluorescent indicator immobilized at said first side of said ion-selective membrane, said fluorescent indicator, when excited, emitting fluorescence having an intensity which is dependent on a potential difference which arises at the boundary surface between said ion-selective membrane and said electrolyte-containing aqueous sample solution due to ion transport from said sample solution into said ion-selective membrane at said boundary surface by means of said ion-carrier material, said fluorescence intensity corresponding to the concentration of electrolyte in the electrolyte-containing aqueous sample solution.
Claim 10
Dependent Claim
130 words
A sensor for determining the concentration of an electrolyte in an aqueous sample solution, said sensor comprising an ion-selective membrane which contains N,N'-bibenzyl-N,N'-diphenyl-1, 2-phenylenedioxide-diacetamide as an ion-carrier material and which has a first side that can be brought into contact with an electrolyte-containing aqueous sample solution, and a potential-sensitive fluorescent indicator immobilized at said first side of said ion-selective membrane, said fluorescent indicator, when excited, emitting fluorescence having an intensity which is dependent on a potential difference which arises at the boundary surface between said ion-selective membrane and said electrolyte-containing aqueous sample solution due to ion transport from said sample solution into said ion-selective membrane at said boundary surface by means of said ion-carrier material, said fluorescence intensity corresponding to the concentration of electrolyte in the electrolyte-containing aqueous sample solution.
Claim 11
Dependent Claim
31 words
A sensor according to claim 8, wherein said ion-selective membrane includes a second side, and wherein said sensor includes a transparent carrier plate supporting said second side of said ion-selective membrane.
Claim 12
Dependent Claim
14 words
A sensor according to claim 9, wherein said transparent plate is composed of glass.
Claim 13
Dependent Claim
39 words
A sensor according to claim 8, wherein said ion-selective membrane includes a second side which is opposite to said first side, and including a light conductor having an end in contact with said second side of said ion-selective membrane.
Claim 14
Dependent Claim
14 words
A sensor according to claim 11, wherein said light conductor is an optical fiber.
Claim 15
Dependent Claim
14 words
A sensor according to claim 11, wherein said potential-sensitive fluorescent indicator is rhodamine B.
Claim 16
Dependent Claim
42 words
A sensor according to claim 11, wherein said ion-selective membrane comprises a polymer membrane having a first side that can be brought into contact with an electrolyte-containing aqueous sample solution, and an ion-carrier material at said first side of said polymer membrane.
References Cited (Backward Citations)
US3932233A
Cited
US4115209A
Cited
US4306877A
Cited
US4547729A
Cited
WO1981002218A1
Cited
US4582809A
Cited
US4502937A
Cited
US4476005A
Cited
US4591550A
Cited
US4560881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |