US4533440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for continuous measurement of the sulfite/sulfate ratio
Assignee: General Electric Co
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Filing: 1983-08-04
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Granted: 1985-08-06
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Expires: 2003-08-04
Abstract
Abstract The redox potential is used as a measure of the ratio of sulfite and sulfate ions in a solution containing these ions. In one embodiment of the present invention a slip stream sample of a process solution is divided into two components one of which is oxidized to serve as a reference solution. The ratio of sulfite and sulfate ions or the oxidation state of the solution is indicated by the oxidation potential of a process solution or the potential difference between electrodes disposed within a process solution and a reference solution.
Inventors
- 👤 Bang M. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/346; B01D53/46; B01D53/48; B01D53/50; B01D53/501; B01D53/504
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
159 words
A method to monitor the ratio of sulfite ion species concentration to sulfate ion species concentration and the rate of change thereof in a solution containing said species, said method comprising the steps of: supplying at least a portion of said solution containing said sulfite and said sulfate ion species to a vessel in which there is disposed a redox electrode and a reference electrode so that both said electrodes are in contact with said solution; determining the electrical potential difference, V 1 , between said electrodes; simultaneously with said supplying step, oxidizing a portion of said supply solution and supplying said oxidized solution to a second vessel in which there is disposed a second redox electrode and a second reference electrode so that both of said second electrodes are in contact with said oxidized solution; determining the electrical potential difference, V 2 , between said second electrodes; and determining the difference between V 1 and V 2 .
Claim 2
Independent Claim
159 words
A method to monitor the ratio of sulfite ion species concentration to sulfate ion species concentration and the rate of change thereof in a solution containing said species, said method comprising the steps of: supplying at least a portion of said solution containing said sulfite and said sulfate ion species to a vessel in which there is disposed a redox electrode and a reference electrode so that both said electrodes are in contact with said solution; determining the electrical potential difference, V 1 , between said electrodes; simultaneously with said supplying step, oxidizing a portion of said supply solution and supplying said oxidized solution to a second vessel in which there is disposed a second redox electrode and a second reference electrode so that both of said second electrodes are in contact with said oxidized solution; determining the electrical potential difference, V 2 , between said second electrodes; and determining the difference between V 1 and V 2 .
Claim 3
Dependent Claim
23 words
The method of claim 1 in which said supplying step is performed continuously along with continuous removal of said solution from said vessel.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which said redox electrode comprises platinum.
Claim 5
Dependent Claim
12 words
The method of claim 1 in which said redox electrode comprises gold.
Claim 6
Dependent Claim
15 words
The method of claim 1 in which said reference electrode comprises mercury and mercury sulphate.
Claim 7
Dependent Claim
40 words
The method of claim 1 in which an additive is provided in at least one of said vessels to provide a stable potential difference, said additive comprising material selected from the group consisting of potassium ferricyanide and potassium iron EDTA.
Claim 8
Independent Claim
168 words
A method to monitor the ratio of sulphite ion species to sulphate ion species in a solution containing said species, said method comprising the steps of: supplying a solution containing said sulphite and said sulphate ion species to a first portion of a vessel internally divided by a semi-permeable barrier into first and second vessel portions, said first vessel portion having disposed therein a first reference or redox electrode in contact with said solution in said first vessel portion, said second vessel portion having disposed therein a second reference or redox electrode, each of said vessel portions having contained therein the same kind of electrode; oxidizing a portion of said solution prior to supplying said solution to said second vessel portion; simultaneously with said previous supply step, supplying to said second vessel portion a quantity of said oxidized solution, said oxidized solution being in contact with said second reference electrode in said second vessel portion; and determining the electrical potential difference, V, between said first and second electrodes.
Claim 9
Independent Claim
168 words
A method to monitor the ratio of sulphite ion species to sulphate ion species in a solution containing said species, said method comprising the steps of: supplying a solution containing said sulphite and said sulphate ion species to a first portion of a vessel internally divided by a semi-permeable barrier into first and second vessel portions, said first vessel portion having disposed therein a first reference or redox electrode in contact with said solution in said first vessel portion, said second vessel portion having disposed therein a second reference or redox electrode, each of said vessel portions having contained therein the same kind of electrode; oxidizing a portion of said solution prior to supplying said solution to said second vessel portion; simultaneously with said previous supply step, supplying to said second vessel portion a quantity of said oxidized solution, said oxidized solution being in contact with said second reference electrode in said second vessel portion; and determining the electrical potential difference, V, between said first and second electrodes.
Claim 10
Dependent Claim
28 words
The method of claim 7 in which said supplying step is performed continuously along with continuous removal of solution from the first and second portions of said vessel.
Claim 11
Dependent Claim
14 words
The method of claim 7 in which said barrier comprises an ion exhange membrane.
Claim 12
Dependent Claim
13 words
The method of claim 7 in which said barrier comprises a liquid junction.
Claim 13
Dependent Claim
41 words
The method of claim 7 in which an additive is provided in at least one of said vessel portions to provide a stable potential difference, said additive comprising material selected from the group consisting of potassium ferricyanide and potassium iron EDTA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |