US4036704A
Expired / Lapsed
US
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Liquid chromatographical method
Assignee: Hitachi Ltd
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Filing: 1973-11-27
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Granted: 1977-07-19
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Expires: 1993-11-27
Abstract
Abstract A separation column for separating and developing a sample to be analyzed is connected to a pump for feeding an eluting solution at an end of the separation column. A means for introducing the sample to be analyzed is provided between the pump and the separation column. Another end of the separation column is connected to an electrochemical detection means through a mixing means. To the mixing means is connected a pump for feeding a catalyst solution capable of promoting an electrode reaction of the sample contained in an eluate solution. A mixture solution of the eluate solution and the catalyst solution from the mixing means is fed to a detection means to quantitatively determine the sample.
Inventors
- 👤 Yoshinori Takata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:37
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/84; G01N2030/8429; G01N2030/8435; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/182; Y10T436/184
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A process for measuring the quantity of at least one electrolytically oxidizable component selected from the group consisting of S 2 - , HS - , SO 3 2 - , HSO 3 2 - , S 2 O 3 2 - , S 2 O 6 2 - , S 3 O 6 2 - , and S 4 O 6 2 - and contained in an eluate solution obtained from a liquid chromatographic separation column, said process comprising mixing with said eluate solution a catalyst, comprising Cu 2 + in a dilute acid solution effecting catalytic oxidation of said at least one electrolytically oxidizable component, and measuring the electric current produced by said catalytic oxidation.
Claim 2
Dependent Claim
117 words
A process for measuring the quantity of at least one electrolytically oxidizable component selected from the group consisting of S 2 - , HS - , SO 3 2 - , HSO 3 2 - , S 2 O 3 2 - , S 2 O 6 2 - , S 3 O 6 2 - , and S 4 O 6 2 - and contained in an eluate solution obtained from a liquid chromatographic separation column, said process comprising mixing with said eluate solution a catalyst, comprising Cu 2 + in a dilute acid solution effecting catalytic oxidation of said at least one electrolytically oxidizable component, and measuring the electric current produced by said catalytic oxidation.
Claim 3
Dependent Claim
22 words
The process of claim 1, wherein the concentration of catalyst in said eluate solution is about 10.sup. -6 to 10.sup. -4 M.
Claim 4
Dependent Claim
19 words
The process of claim 2, wherein the concentration of catalyst in said eluate solution is about 10.sup. -5 M.
Claim 5
Dependent Claim
195 words
A process for measuring the quantity of at least one electrolytically oxidizable component selected from the group consisting of S 2 - , HS - , SO 3 2 - , HSO 3 2 - , S 2 O 3 2 - , S 2 O 6 2 - , S 3 O 6 2 - , and S 4 O 6 2 - and contained in an eluate solution obtained from a liquid chromatographic separation column, said process comprising mixing with said eluate solution a catalyst selected from the group consisting of I - , MnO 4 - , Mn 2 + , Co 2 + , Pb 2 + , Fe 2 + , Fe 3 + , Cu 2 + , SnCl, mannitol, glycerin and methanol, effecting catalytic oxidation of said at least one electrolytically oxidizable component by contacting the mixture of the eluate solution and the catalyst with a working electrode and supplying an electrolyte to an auxiliary electrode separated from said working electrode by a diaphragm, said auxiliary electrode and said working electrode being maintained at a constant voltage difference, and measuring the electric current produced by said catalytic oxidation.
Claim 6
Dependent Claim
195 words
A process for measuring the quantity of at least one electrolytically oxidizable component selected from the group consisting of S 2 - , HS - , SO 3 2 - , HSO 3 2 - , S 2 O 3 2 - , S 2 O 6 2 - , S 3 O 6 2 - , and S 4 O 6 2 - and contained in an eluate solution obtained from a liquid chromatographic separation column, said process comprising mixing with said eluate solution a catalyst selected from the group consisting of I - , MnO 4 - , Mn 2 + , Co 2 + , Pb 2 + , Fe 2 + , Fe 3 + , Cu 2 + , SnCl, mannitol, glycerin and methanol, effecting catalytic oxidation of said at least one electrolytically oxidizable component by contacting the mixture of the eluate solution and the catalyst with a working electrode and supplying an electrolyte to an auxiliary electrode separated from said working electrode by a diaphragm, said auxiliary electrode and said working electrode being maintained at a constant voltage difference, and measuring the electric current produced by said catalytic oxidation.
Claim 7
Dependent Claim
17 words
The process of claim 4, wherein said electrolyte is a solution of potassium ferricyanide and potassium ferrocyanide.
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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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |