Sediments collected in Tiber river and in its main tributary water courses within the urban area of Rome were tested for Ž . mutagenicity by means of Vicia faba root tips micronucleus MN test. Representative samples were scored for Ž . micronucleus generating events chromosomerchromatid loss and fragments too. Sediments were assayed for content of the Ž . Ž thirteen most important chemicals of polycyclic aromatic hydrocarbon PAH group and for some heavy metal ions Cd, Cr, . Ž . Cu, Ni, Pb, Zn . Samples were collected in four tributary rivers Prima Porta, Acqua Traversa, Aniene and Magliana just before their confluence with Tiber river and at different stations along the Tiber river itself upstream and downstream the sites of confluence of the sampled tributaries. All samples were collected in July 1992. An alarming level of mutagenicity was reached in most of the tested stations, with an effect comparable to an X-rays exposure up to 0.4 Gy. Chemical analysis showed that the total amount of identified PAHs ranged from 4.5 to 625.2 ngrg of dry matrix in the different stations and the total amount of heavy metals ranged from 130 to 570 ppm. Tiber mutagenicity is likely to be mainly due to local factors such as the confluence of a small polluted tributary rather than to large scale effect due to an upstream-downstream relationship. q
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