Quantitative Analysis of SO₄^2- and SiF₆^2- in Chromium Plating Solution by Capillary Electrophoresis

Abstract

Sulfate(SO₄^2-) and hexafluorosilicate(SiF₆^2-) ions in chromium plating bath were simultaneously analyzed by capillary electrophoresis(CE), using a chromate buffer with indirect UV-detection at 270 nm. Determination was carried out within 10 minutes by diluting the solution with water without any pretreatment. The CE method was found to be powerful technique for chromium plating bath control.