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 r eduction current of the complex is about 0.0V vs. Ag/AgCl reference electro de at pH=4.0. The influences of various experimental parameters on the curr ent 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 w as 2.3% (n=5) for Cu(II) concentration of 10.0 ng/ml, with a limit of detec tion of 0.2 ng/ml. The influence of potentially interfering ions was comple tely studied. The method has been applied for the determination of Cu(II) i n wafer samples.