离子色谱法检测酸性镀铜液中的微量氯离子

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

采用Na2CO3-NaHCO3为淋洗液和抑制电导检测,对酸性镀铜液中的微量氯离子进行检测。采用AgNO3作为沉淀剂使Cl-分离富集,再用Na2S2O3溶液溶解沉淀后进行检测,可以很好地消除酸性电镀液中高浓度SO4^2-的干扰。该方法线性良好,Cl^-的检出限为0.01μg/mL,回收率在98.6%-101.7%之间,由于该方法能够很好地消除大量SO4^2-的干扰,在电镀铜工业中对酸性镀铜液中氯离子的监控可发挥作用。

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 SO4^2- 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 ohtained. The results indicate that the method is simple, rapid, accurate and sensitive for the determination of trace Cl^- in acidic copper-plating bath.