1 23 Environmental Earth Sciences ISSN 1866-6280 Environ Earth Sci DOI 10.1007/s12665-015-4096-1 Fractionation of heavy metals and evaluation of the environmental risk for the alkaline soils of the Thriassio plain: a residential, agricultural, and industrial area in Greece Dionisios Gasparatos, Georgia Mavromati, Panagiotis Kotsovilis & Ioannis Massas