The complex formed by lead and 4,5-Dihydroxy-3-(p-Sulfophenylazo)-2,7-Naphthalene Disulfonic Acid Trisodium Salt (SPADNS) was able to be adsorbed on the HMDE. In this investigation we were able to determine lead (II) in water and edible oil samples, using Differential Pulse Adsorptive Stripping Voltammetry (DPAdSV) technique. The influence of variables is completing studied. Linear dependence between the peak current and lead concentration in the (NH3/NH4Cl) buffer in pH=7.5 observed in the range 0.7 – 115.0 ng ml-1 of Pb(II), for accumulation time 100 s and sweep rate 24 mV s-1. The detection limit for Pb(II) was 0.110 ng ml-1, and the RSD at a concentration level of 45 ng ml-1 was 1.48%. This method has been applied for the determination of Lead in Edible Oil and Water Samples with satisfactory results.
