ELECTRODEPOSITION AND STRIPPING PROCESS BY LONG OPTICAL PATHLENGTH POTENTIAL-STEP TRANSMISSION CHRONOABSORPTOMETRY

Based on the transmittance-averaged rather than absorbance-averaged mo del of long optical pathlength transmission spectroelectrochemistry, a reasonable theoretical model for potential-step electrodeposition and stripping process has been developed. It can accurately predict the s tripping-chronoabsorptometric waveform with a peak absorbance with res pect to the time rather than that with no peak but only a theoretical maximum absorbance at the initial stage of the stripping process. Cu(I I) in NH3.H2O-NH4Cl supporting electrolyte is utilized to verify the t heory. With this anodic stripping spectroelectrochemical method, a det ection limit of ca 0.01mM without stirring or ca 0.002mM under stirrin g during deposition can be achieved. An application in the analysis of copper in practical samples is presented.