Patent US3897315A successfully refreshed from Google Patents.
US3897315A
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Method of determining hydrogen sulfide
Assignee: Thermo Orion Inc
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Filing: 1974-07-10
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Granted: 1975-07-29
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Expires: 1994-07-10
Abstract
Abstract An improved gas-sensing electrochemical cell for measuring dissolved hydrogen sulfide in a sample solution. The cell comprises a potentiometric sulfide ion-sensitive electrode and a fluoride ion-sensitive electrode, both in contact with an acid internal standard solution comprising an aqueous solution of a fluoride salt. A hydrophobic hydrogen sulfide gas-permeable membrane separates the sample solution from the internal solution.
Inventors
- 👤 John H Riseman
- 👤 Martin S Frant
- 👤 John A Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:15
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
50 words
DIFFUSING THE HYDROGEN SULFIDE THROUGH A MEMBRANE INTO A PH BUFFERED ELECTROLYTE CONTAINING A FIXED CONCENTRATION OF REFERENCE IONS UNTIL THE PARTIAL PRESSURES OF THE HYDROGEN SULFIDE ON BOTH SIDES OF THE MEMBRANE ARE IN EQUILIBRUM, SAID MEMBRANE BEING PERMEABLE TOHYDROGEN SULFIDE BUTSUBSTANTIALLY IMPERMEABLE TO LIQUIDS AND IONIC CONSTITUENTS AND
Claim 2
Dependent Claim
50 words
DIFFUSING THE HYDROGEN SULFIDE THROUGH A MEMBRANE INTO A PH BUFFERED ELECTROLYTE CONTAINING A FIXED CONCENTRATION OF REFERENCE IONS UNTIL THE PARTIAL PRESSURES OF THE HYDROGEN SULFIDE ON BOTH SIDES OF THE MEMBRANE ARE IN EQUILIBRUM, SAID MEMBRANE BEING PERMEABLE TOHYDROGEN SULFIDE BUTSUBSTANTIALLY IMPERMEABLE TO LIQUIDS AND IONIC CONSTITUENTS AND
Claim 3
Dependent Claim
15 words
METHOD OF DETERMINING THE HYDROGEN SULFIDE CONTENT OF A SAMPLE SOLUTION COMPRISING THE STEPS OF:
Claim 4
Dependent Claim
15 words
METHOD OF DETERMINING THE HYDROGEN SULFIDE CONTENT OF A SAMPLE SOLUTION COMPRISING THE STEPS OF:
Claim 5
Dependent Claim
26 words
A method in accordance with claim 1 further including the step of adjusting the temperature of said sample solution to equal the temperature of the electrolyte.
Claim 6
Dependent Claim
49 words
measuring the potential developed between an ion sensitive electrode having a substantially Nernstian response to the activity of sulfide ions and an ion sensitive electrode having a substantially Nernstian response to the reference ions but not responsive to sulfide ions, said electrodes being in operating contact with the electrolyte.
Claim 7
Dependent Claim
49 words
measuring the potential developed between an ion sensitive electrode having a substantially Nernstian response to the activity of sulfide ions and an ion sensitive electrode having a substantially Nernstian response to the reference ions but not responsive to sulfide ions, said electrodes being in operating contact with the electrolyte.
Claim 8
Dependent Claim
49 words
MEASURING THE POTENTIAL DEVELOPED BETWEEN AN ION SENSITIVE ELECTRODE HAVING A SUBSTANTIALLY NERNSTAIN RESPONSE TO THE ACTIVITY OF SULFIDE IONS AND AN ION SENSITIVE ELECTRODE HAVING A SUBSTANTIALLY NERNSTAIN RESPONSE TO THE REFERENCE IONS BUT NOT RESPONSIVE TO SULFIDE IONS, SAID ELECTRODES BEING IN OPERATING CONTACT WITH THE ELECTROLYTE.
Claim 9
Dependent Claim
49 words
MEASURING THE POTENTIAL DEVELOPED BETWEEN AN ION SENSITIVE ELECTRODE HAVING A SUBSTANTIALLY NERNSTAIN RESPONSE TO THE ACTIVITY OF SULFIDE IONS AND AN ION SENSITIVE ELECTRODE HAVING A SUBSTANTIALLY NERNSTAIN RESPONSE TO THE REFERENCE IONS BUT NOT RESPONSIVE TO SULFIDE IONS, SAID ELECTRODES BEING IN OPERATING CONTACT WITH THE ELECTROLYTE.
Claim 10
Dependent Claim
19 words
A method in accordance with claim 1 further including the step of adding an anti-oxidant to the sample solution.
Claim 11
Dependent Claim
30 words
A method in accordance with claim 1 further including the step of acidifying the sample solution to convert substantially all sulfide ions and bisulfide ions contained therein to hydrogen sulfide.
References Cited (Backward Citations)
US2864747A
Cited
US3515658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |