1. Institute of Methodologies for Environmental Analysis; CNR; C.da S. Loja- Zona Industriale 85050 Tito Scalo (PZ) Italy
2. Research Institute for Geo-Hydrological Protection; CNR; Via della Madonna Alta, 126 06128 Perugia Italy
3. Dep. of Environmental and Chemical Engineering; Univ. of Calabria; Via P. Bucci, 42B 87036 Rende (CS) Italy