US4083754A
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Voltammetric apparatus and method
Assignee: Mitsubishi Chemical Corp
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Filing: 1976-04-26
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Granted: 1978-04-11
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Expires: 1996-04-26
Abstract
Abstract In apparatus for use in differential pulse anodic stripping voltammetry the period of the pulse voltage is selected to be in a range of from 16.7 to 400 milliseconds for the purpose of analyzing an extremely small quantity of metal ions at high speeds and at high sensitivities.
Inventors
- 👤 Koremitsu Outsuka
- 👤 Kazuyoshi Kawasaki
- 👤 Yutaka Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:02
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/48; G01N27/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
151 words
A method of differential pulse anodic stripping voltammetry comprising the steps of filling a solution containing ions of a metal to be analyzed into an electrolytic cell having a working electrode and a counter electrode, applying a plating voltage across the counter electrode and the working electrode to plate the same with the metal, applying across the counter electrode and the working electrode a DC stripping voltage having superimposed thereon a pulse voltage having a repetition period of 16.7 to 400 milliseconds in order to strip the metal that has been plated on the working electrode by the plating voltage, measuring a first sampling current which flows through the working electrode during a predetermined interval in which the pulse voltage is not applied, measuring a second sampling current which flows through the working electrode while the pulse voltage is applied, and determining the difference between the first and second sampling currents.
Claim 2
Independent Claim
151 words
A method of differential pulse anodic stripping voltammetry comprising the steps of filling a solution containing ions of a metal to be analyzed into an electrolytic cell having a working electrode and a counter electrode, applying a plating voltage across the counter electrode and the working electrode to plate the same with the metal, applying across the counter electrode and the working electrode a DC stripping voltage having superimposed thereon a pulse voltage having a repetition period of 16.7 to 400 milliseconds in order to strip the metal that has been plated on the working electrode by the plating voltage, measuring a first sampling current which flows through the working electrode during a predetermined interval in which the pulse voltage is not applied, measuring a second sampling current which flows through the working electrode while the pulse voltage is applied, and determining the difference between the first and second sampling currents.
Claim 3
Dependent Claim
19 words
The method according to claim 1 wherein the repetition period of the pulse voltage is 33.4 to 200 milliseconds.
Claim 4
Dependent Claim
18 words
The method according to claim 1 wherein the duration of the pulse voltage is 8.3 to 100 milliseconds.
Claim 5
Dependent Claim
20 words
The method according to claim 1 wherein the stripping voltage is swept at a speed of 10 to 90 millivolts/sec.
Claim 6
Dependent Claim
16 words
The method according to claim 4 wherein the sweeping speed ranges from 20 to 60 millivolts/sec.
Claim 7
Dependent Claim
22 words
The method according to claim 1 wherein the first sampling current is measured in an interval immediately prior to each pulse voltage.
Claim 8
Dependent Claim
25 words
The method according to claim 1 wherein the second sampling current is measured during a predetermined interval of the latter half of each pulse voltage.
Claim 9
Dependent Claim
107 words
Differential pulse anodic stripping voltametry comprising: an electrolytic cell having a working electrode and a counter electrode; a source of plating voltage, a source of sweeping voltage and a source of pulse voltage having a repetition period of 16.7 to 400 milliseconds for impressing plating voltage, stripping voltage and pulse voltage respectively across the working electrode and the counter electrode; a current-voltage converter for converting the current flowing through the working electrode into voltage for producing two sample voltages; voltage holding means for holding the two sample voltages; and a differential amplifier for amplifying the difference between the two sample voltages held by the voltage holding means.
Claim 10
Dependent Claim
107 words
Differential pulse anodic stripping voltametry comprising: an electrolytic cell having a working electrode and a counter electrode; a source of plating voltage, a source of sweeping voltage and a source of pulse voltage having a repetition period of 16.7 to 400 milliseconds for impressing plating voltage, stripping voltage and pulse voltage respectively across the working electrode and the counter electrode; a current-voltage converter for converting the current flowing through the working electrode into voltage for producing two sample voltages; voltage holding means for holding the two sample voltages; and a differential amplifier for amplifying the difference between the two sample voltages held by the voltage holding means.
Claim 11
Dependent Claim
18 words
The apparatus according to claim 8 wherein the period of the pulse voltage is 33.4 to 200 milliseconds.
Claim 12
Dependent Claim
18 words
The apparatus according to claim 8 wherein the duration of the pulse voltage is 8.3 to 100 milliseconds.
Claim 13
Dependent Claim
19 words
The apparatus according to claim 8 wherein the stripping voltage has a sweeping speed of 1 to 90 millivolts/sec.
Claim 14
Dependent Claim
15 words
The apparatus according to claim 11 wherein the sweeping speed is 20 to 60 millivolts/sec.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |