Determination of copper by an adsorption differential pulse stripping method with naphthol derivative

A simple, sensitive and selective method is proposed for the determination of copper(II) by adsorption-differential pulse shipping method. This method is based on the selective accumulation of the complexes of Cu(II) with 1-(2-pyridylazo)-2-Naphthol and then reduction of the complex on a HMDE. The reduction current of the complex is about 0.0V vs. Ag/AgCl reference electrode at pH=4.0. The influences of various experimental parameters on the current peak were completely studied. The calibration graph was linear up to 50.0 ng/ml for a deposition time of 60 sec. The relative standard deviation was 2.3% (n=5) for Cu(II) concentration of 10.0 ng/ml, with a limit of detection of 0.2 ng/ml. The influence of potentially interfering ions was completely studied. The method has been applied for the determination of Cu(II) in wafer samples.