Maroulis M, Economou A, Voulgaropoulos A. Determination of Cd and Pb in phosphorites and phosphate fertilizers by means of a portable voltammetric analyzer based on ?Virtual Instrumentation?. Electroanalysis: An International Journal Devoted to Fundamental and Practical Aspects of ElectroanalysisElectroanalysis: An International Journal Devoted to Fundamental and Practical Aspects of Electroanalysis. 2007;19:2149-2154.