Determination of trace chloride ion in acidic copper-plating bath by ion chromatography

Using Na2CO3 and NaHCO3 as eluents,trace Cl-in acidic copper-plating bath can be determined with anion-exchange and suppressor conductivity detection.A simple method which could eliminate the effect of SO42-by separation and enrichment of Cl-in the copper-plating bath with AgNO3 as precipitant was discussed in this article.The recoveries of added standard were 98.62%～101.70%,and good linearity and low detection limit for Cl-were obtained.The results indicate that the method is simple,rapid,accurate and sensitive for the determination of trace Cl-in acidic copper-plating bath.