Initial experiments for Mn (II) detection by anodic stripping voltammetry (ASV) and cathodic stripping voltammetry (CSV) at a GCE were performed in hydroethanolic solutions containing 25% (v/v) ethanol and 0.04 mol L-1 BR buffer at different pH values adjusted in aqueous solution before ethanol addition (from 2.0 to 8.0). ASV measurements for 100 μg L-1 Mn (II) revealed a stripping peak. However, this peak did not increase after constant additions of standard solutions of Mn (II) in hydroethanolic medium. On the other hand, CSV measurements revealed stripping peaks which increased linearly with increasing concentrations of Mn (II) in hydroethanolic medium. This result is in agreement with previous works that have reported better results for CSV instead of ASV for Mn (II) detection [19, 20]. The reactions involved in the deposition and stripping of Mn are described in Eqs. (1), (2) and (3) as follows. Two stripping peaks are observed during the electrochemical reduction indicating that the reduction of MnO2 occurs in two steps.