Patent ID: 7427344
Filing Date: 2008-09-23
Classification: C25D

Abstract:
1. A method for determining concentration of an organic component in a sample electrolytic solution, said method comprising the steps of: (a) applying a potential step to the sample electrolytic solution by using at least a working electrode and a reference electrode; (b) measuring double layer capacitance of the working electrode in said sample electrolytic solution under the applied potential step; (c) determining the concentration of the organic component in said sample electrolytic solution, based on the double layer capacitance measured in step (b), and (d) adding organic component when the concentration of organic component falls below effective electrolytic solution levels, wherein the sample electrolytic solution comprises a copper electroplating solution comprising copper ions, and wherein the copper ions do not deposit onto the working electrode; wherein the double layer capacitance of the working electrode is measured by monitoring current response of the sample electrolytic solution under the potential step over time; and wherein the current response is measured using at least one measuring device selected from the group consisting of poteniometers, ammeters and ohmmeters.