Abstract
Sediment traps deployed in Buenos Aires sewage outfall area collected a substantial amount of material (average mass flux 22±12gcm(2)year(-1)) with very high metal concentrations, mostly in the range of hazardous exposition for organisms (Zn: 138-671, Cu: 41-273, Cr: 44-255 and Pb: 26-260μgg(-1)). The combination of high mass fluxes and concentrations results in huge metal fluxes (0.005-0.7 to 3.6-31gm(-2)day(-1) for minor elements and Fe, respectively). Metal concentrations were correlated to the total mass flux and total organic carbon but with different trends for redox-sensitive Fe and Mn (negative) and anthropogenic elements (positive). This reflects the key role of organic discharges promoting anoxia with Fe and Mn evasion, and also contributing toxic metals.
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