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Major (AI, Si, Ca, Mg, Fe), minor (Mn) and trace elements (Zn, Pb, Cr, Cu, Ag, Cd), organochlorine (PCB congeners, pp'DOT and metabolites) and triand dibutyltin leveis were determined in 47 surface sediments from the Mondego River estuary. Concentrations varied within different ranges in river, sand and sandy mud sam pies. Higher values of Si and Ca were found in sands from the lower estuary while leveis of Fe, Mn, Zn, Cu, Cd, Cr, tPCB and tOOT were higher in sandy muds and fluvial sediments. Linear correlations between Fe, Mg, Mn, Zn, Cu, Cr, Cd and AI indicate that some variability in their concentrations may be explained by the AI fraetion of the sediments. Poor correlations to AI were found for organic contaminants (tPCB, tOOT, TBT +OBT). The contrasting longitudinal distributions of tOOT Ag and Ca concentrations indicate the marine and river contribution, respeetively. ln spite of low contamination of sediments, leveis of other contaminants seem to refleet the nature of the particles and the local anthropogenic sources.

Elemental composition and contaminants in surface sediments of the Mondego river estuary