Chatzitheodorou E, Economou A, Voulgaropoulos A. Trace Determination of Chromium by Square?Wave Adsorptive Stripping Voltammetry on Bismuth Film Electrodes. Electroanalysis: An International Journal Devoted to Fundamental and Practical Aspects of ElectroanalysisElectroanalysis: An International Journal Devoted to Fundamental and Practical Aspects of Electroanalysis. 2004;16:1745-1754.