US3859191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen cyanide sensing cell
Assignee: Thermo Orion Inc
•
Filing: 1973-04-09
•
Granted: 1975-01-07
•
Expires: 1993-04-09
Abstract
Abstract An improved gas-sensing electrochemical cell for measuring hydrogen cyanide gas in a sample solution. The cell comprises a potentiometric silver ion-sensitive electrode and a reference electrode, both in contact with an internal standard solution comprising an aqueous solution of an argento cyanide complex. A hydrophobic hydrogen cyanide gas-permeable membrane separates the sample solution from the internal solution.
Inventors
- 👤 Martin S Frant
- 👤 John H Riseman
- 👤 John A Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:57
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/4035
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
AN IMPROVED GAS-SENSING ELECTROCHEMICAL CELL FOR MEASURING THE HYDROGEN CYANIDE CONTENT OF A SAMPLE SOLUTION, SAID CELL COMPRISING IN COMBINATION A POTENTIOMETRIC ION-SELECTIVE MEMBRANE ELECTRODE FOR PROVIDING AN ELECTROCHEMICAL POTENTIAL RESPONSIVELY TO THE ACTIVITY OF SILVER IONS OR CADIUM IONS IN SOLUTION; A BODY OF ELECTROLYTE IN CONTACT WITH THE ION-SELECTIVE PORTION OF SAID POTENTIOMETRIC ION-SELECTIVE ELECTRODE, SAID ELECTROLYTE INCLUDING IONS OF A SOLUBLE CYANIDE COMPLEX OF THE METAL OF ION TO WHICH SAID POTENTIOMETRIC ELECTRODE IS SELECTIVE. A REFERENCE ELECTRODE IN CONTACT WITH SAID ELECTROLYTE FOR PROVIDING A SUBSTANTIALLY FIXED POTENTIAL WITH RESPECT TO SAID ELECTROLYTE; A HYDROGEN CYANIDE PERMABLE MEMBRANE ARRANGED SO AS TO SEPARATE THE ELECTRODES AND ELECTROLYTE FROM SAID SAMPLE SOLUTION.
Claim 2
Dependent Claim
115 words
AN IMPROVED GAS-SENSING ELECTROCHEMICAL CELL FOR MEASURING THE HYDROGEN CYANIDE CONTENT OF A SAMPLE SOLUTION, SAID CELL COMPRISING IN COMBINATION A POTENTIOMETRIC ION-SELECTIVE MEMBRANE ELECTRODE FOR PROVIDING AN ELECTROCHEMICAL POTENTIAL RESPONSIVELY TO THE ACTIVITY OF SILVER IONS OR CADIUM IONS IN SOLUTION; A BODY OF ELECTROLYTE IN CONTACT WITH THE ION-SELECTIVE PORTION OF SAID POTENTIOMETRIC ION-SELECTIVE ELECTRODE, SAID ELECTROLYTE INCLUDING IONS OF A SOLUBLE CYANIDE COMPLEX OF THE METAL OF ION TO WHICH SAID POTENTIOMETRIC ELECTRODE IS SELECTIVE. A REFERENCE ELECTRODE IN CONTACT WITH SAID ELECTROLYTE FOR PROVIDING A SUBSTANTIALLY FIXED POTENTIAL WITH RESPECT TO SAID ELECTROLYTE; A HYDROGEN CYANIDE PERMABLE MEMBRANE ARRANGED SO AS TO SEPARATE THE ELECTRODES AND ELECTROLYTE FROM SAID SAMPLE SOLUTION.
Claim 3
Dependent Claim
19 words
An electrochemical cell as defined in claim 1 wherein the said potentiometric ion-selective electrode is a silver ion-selective electrode.
Claim 4
Dependent Claim
19 words
An electrochemical cell as defined in claim 2 wherein said electrolyte includes ions of a soluble argento cyanide complex.
Claim 5
Dependent Claim
43 words
An electrochemical cell as defined in claim 2 wherein the said potentiometric ion-selective electrode has, as the ion-selective portion thereof a membrane of substantially pure Ag2S which is substantially free of silver on at least the surface thereof intended to contact said electrolyte.
Claim 6
Dependent Claim
18 words
An electrochemical cell as defined in claim 1 wherein said potentiometric ion-selective electrode is a cadmium ion-selective electrode.
Claim 7
Dependent Claim
19 words
An electrochemical cell as defined in claim 5 wherein said electrolyte includes ions of a soluble cadmium cyanide complex.
Claim 8
Dependent Claim
28 words
An electrochemical cell as defined in claim 5 wherein said potentiometric ion-selective electrode has, as the ion-selective portion thereof a membrane of a mixture of Ag2S and CdS.
Claim 9
Dependent Claim
29 words
An electrochemical cell as defined in claim 1 wherein said reference electrode is a fluoride ion-selective electrode and wherein said electrolyte contains fluoride ions at a substantially fixed concentration.
Claim 10
Dependent Claim
24 words
An electrochemical cell as defined in claim 8 wherein the ion selective portion of said reference electrode is a membrane of crystalline lanthanum fluoride.
Claim 11
Dependent Claim
24 words
An electrochemical cell as defined in claim 1 wherein the pH of said electrolyte is in the range between pH 7 to pH 11.
Claim 12
Dependent Claim
18 words
An electrochemical cell as defined in claim 1 wherein the pH of said electrolyte is substantially around 8.5.
References Cited (Backward Citations)
US3357908A
Cited
US3492216A
Cited
US3563874A
Cited
US3591464A
Cited
US3649505A
Cited
US3785948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |