Heavy metals in Ligurian Sea Sediments: distribution of Cr,Cu, Ni,and Mn in Superficial Sediments

Fifty-six samples of superficial marine sediment collected in the continental shelf area between Arenzano and Capo Noli were examined, along with nineteen fluvial sediment samples from creeks flowing into the area under examination. The materials were subjected to textural and chemical analyses, the latter to determine the Cr, Cu, Ni, and Mn contents using two different procedures.The geology and physiography of the coastal belt were also studied. From the data obtained, maps were drafted showing the distribution of metals: these experimental values were compared graphically to sediment texture values. High values for Cr and Ni were found, justified by stream erosion on basic rock outcrops. Only for Cr was a significant input of artificial origin found. In the case of Cu and Mn, relations with the organic fraction and texture of sediments, respectively, have been evidenced.