Abstract
An isotachophoretic method for determination of metal cyanide ions such as [Au(CN)2]-, [Ag(CN)2]-, and [Cu(CN)3]2- in gold, silver and copper plating solutions was proposed. Determination was carried out within 20 minutes by diluting the solution with water without any pretreatment. Inorganic ions such as cyanide ions, carbonate ions and hypophosphite, phosphite, phosphate and pyrophosphate ions, and organic compounds such as organic acids and chelates were determined simultaneously.
Other than those for carbonate ions, the concentration values obtained by isotachophoresis were the same as those obtained by gravimetric and volumetric methods.
These results suggest that impurities dragged in from pretreatment processes may also be determinable. The isotachophoretic method has been found to be of value for the control of plating solutions.
