Electrochemical analysis of metallic depolarizers in gold electrodeposition
AssigneeECI Technology, Inc.
InventorsPatrick Saitta, Jingjing Wang, Eugene Shalyt
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Abstract
The present disclosure provides methods for determining concentration of various trace metal ions in aqueous solutions, such as gold plating solutions. At a particular fixed reduction potential, the cathodic current can suddenly increase in magnitude after a certain period of time (e.g., an incubation time) passes in the presence of a trace metal ion (e.g., Tl(I)), where the incubation time is inversely proportional to the concentration of trace metal in the electrolyte. The concentration of the trace metal can be calculated after measuring the incubation time and comparing it against a calibration curve.
Claims10
A method for determining concentration of a metal ion, the method comprising:
- providing an aqueous solution comprising a first metal ion;
- performing a first amperometric scan on the aqueous solution to obtain a chronoamperometric voltammogram;
- calculating a first derivative of the chronoamperometric voltammogram;
- calculating the concentration of the metal ion by comparing the first derivative of the chronoamperometric voltammogram to a calibration curve.
Dependencies are inferred from the claim text.