Analysis of Lead Ions in a Waste Solution Using Infrared Photo-Diode Electrode.

To detect lead ions using electrochemical voltammetric analysis, Infrared Photo-Diode Electrode (IPDE) was applied via cyclic and square wave stripping voltammetry. Lead ions were deposited at 0.5 V (versus Ag/AgCl) accumulation potential. Instrumental measurements systems were made based on a simple and compact detection system. The stripping voltammetric and cyclic voltammetric optimal parameters were searched. The results yielded a cyclic range of 40∼240 mgl-1 Pb(II) and a square wave stripping working range of 0.5∼5.00 mgl-1 Pb(II). The relative standard deviation at 2 and 4 mgl-1 Pb(II) was 0.04% and 0.02% (n = 15), respectively, using the stripping voltammetric conditions. The detection limit was found to be 0.05 mgl-1 with a 40 sec preconcentration time. Analytical interference ions were also evaluated. The proposed method was applied to determine lead ions in various samples. © Korean Society of Toxicology 2008.