Multi-element characterization of estuarine sediments and waters

Abstract

Trace elements were studied in the sediments and waters of the Atlantic Ocean, under the influence of Tagus river estuary, near Lisbon (Portugal). Elemental concentrations of Cr, Mn, Fe, Ni, Cu, Zn, As, Sr, Zr and Pb, were determined by total reflection X-ray fluorescence (TXRF), in surface recent sediments (fraction < 63 µm) and bottom waters at 20 sampling sites. A comparison was made between the results obtained and the recommended values given in the literature for estuarine sediments and also for ocean waters and concentration factors (sediment/water elemental concentrations). This study showed high concentrations for As and Pb, in sediments and an enrichment for all the elements determined in waters, although the concentration factors were always below the recommended values, except for Fe and As. Copyright © 1999 John Wiley & Sons, Ltd.