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We present here a progress report of an environmental geochemical study of the Volturno river basin (Southern Italy). Forty new major-, minorand trace-element chemical analyses and one-hundred Pb isotopic compositions of stream sediments and drill cores are used to establish geochemical backgrounds and baselines in this populated, industrialized, and agricultural area. Lead isotopic compositions distinctive of certain isotopic reservoirs such as gasoline used in Western Europe and abundances of various toxic elements potentially dangerous to human health ( e.g. Zn, As, Pb, Cd, Cr, etc.) are correlated. The isotopic and trace element data can be used to suggest possible sources of contamination including: lead from gasoline (207Pb/206Pb=1.109-l.lll), natural lead leached out of rocks and soils (207Pb/206Pb=l. 198-1.200) and lead from treated or untreated urban wastes (207Pb/206Pb=1.1471.162). The Pb isotopic composition of the stream sediments overlap the values of 206Pb/207Pb and 206Pb/204Pb of lead in gasoline, suggesting an important contribution from an anthropogenic source. The results also plot along a mixing line that overlaps the field of volcanic rocks outcropping in the area which is consistent with a contribution from volcanic and sedimentary rocks in the area.

u.s. geological survey open file report/open-file report

Pb isotopes and toxic metal abundances in the floodplain and stream sediments from the Volturno River basin (Campania, Italy); natural and anthropogenic contributions