Cd, Pb and Cu in spring waters of the Sibylline Mountains National Park (Central Italy), determined by square wave anodic stripping voltammetryC. Truzzi, A. Annibaldi, S. Illuminati, C. Finale and G. ScarponiE3S Web of Conferences, 1 (2013) 24007DOI: https://doi.org/10.1051/e3sconf/20130124007