Patent ID: 6740242
Filing Date: 2004-05-25
Classification: C25D,G01N

Abstract:
A method of managing a plating liquid composition, comprising:sampling a plating liquid in a plating bath; separating and quantifying an additive in the sampled plating liquid using liquid chromatography by: introducing the sampled plating liquid and pure water into a separating column to remove ionic components from the plating liquid before the additive is quantified so as to produce ionic component-free sampled plating liquid: introducing the ionic component-free sampled plating liquid and a hardly soluble liquid into the separating column to elute the additive in the ionic component-free sampled plating liquid; and detecting the intensity of light scattered by an unevaporated solute including the eluted additive remaining after the ionic component-free sampled plating liquid has been evaporated through spraying; comparing the quantified value of the additive with a given predetermined concentration of the additive; and adding a solution including the additive to the plating liquid based on the compared result.