Voltammetric apparatus and method
First Claim
1. A method of differential pulse anodic stripping voltammetry comprising the steps offilling 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, anddetermining the difference between the first and second sampling currents.
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Accused Products
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.
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Citations
12 Claims
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1. 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.
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8. Differential pulse anodic stripping voltametry comprising:
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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. - View Dependent Claims (9, 10, 11, 12)
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Specification