POTENTIALLY TOXIC ELEMENTS DISTRIBUTION IN URBAN, AGRICULTURAL AND PINEWOOD SOILS / ELEMENTS POTENTIELLEMENT TOXIQUES DISTRIBUTION IN SOLS DANS UN PARC URBAIN, UNE EXPLOITATION AGRICOLE ET UNE PINEDE / DISTRIBUZIONE DI ELEMENTI POTENZIALMENTE TOSSICI IN SUOLI URBANI, AGRICOLI E DI PINETA

Potentially toxic elements (PTEs) abundances in top soil and along the soil profiles from areas affected by different anthropogenic inputs were investigated. The study area is located within the Ravenna Municipality, a complex territorial system highly affected by industrial (a large petrolchemical complex) agricultural activi-ties. Three zones with distinct environmental features were identified: the San Vitale Pinewood affected by atmospheric deposition pollutans from the industrial complex (PW1, PW4, PW6 and PW8 soil profiles); a public garden within the Ra-venna city center, mainly affected by traffic pollution (GP1 soil profile); the "Luigi Perdisa" farm located immediately northwards Ravenna was selected due to the use of fertilizers as well as atmospheric deposition (PER2 soil profile). The total con-centration of PTEs (Ba, Cr, Cu, Cr, Ni, Pb, Zn) was determined by X ray fluores-cence spectrometry (XRF), and the pseudo-total concentration with aqua regia di-gestion (AR) and ICP-OES quantification in order to evaluate the extractability of the elements. Results showed a significant increase of some PTEs (Cu, Pb, Zn) in the top soil compared to the endopedon. In the Ravenna urban park (GP1 station), Pb and Zn concentrations exceeded the threshold values established by current Ital-ian laws for soils from "public, residential and private areas" (D. Lgs 152/2006). The correlation between top soil and the subsoil highlighted that some PTEs, such as Cu, Pb and Zn, are anthropogenic and they are mainly associated to the deposi-tion of airborne pollutants, whereas other elements (Cr and Ni) are lithogenic.