Fraccionamiento metálico en sedimentos mareales de un estuario históricamente afectado por drenaje ácido de minas en el Río Guadiana

Abstract

The metallic fractionation of the surface sediment from the Guadiana river estuary has been studied by a BCR-modified extraction, in order to identify the impacts of these metals in the ecosystem. In this sense, elements such as Co, Cr, Ni and Fe are found in natural concentrations in sediments, associated to the residual fraction, while others such as Cd, Zn, Mn, Cu, Pb and As have shown significative extraction rates mainly associated with FI (bioavailable), implying an environmental hazard to the Guadiana estuary. Elements as Zn (in high concentrations) and Cd (very toxic) are underlined by their environmental hazard, as they associate to the bioavailable fraction ofthe sediment (66 and 88% respectively)