Abstract
Geochemical forms of heavy metals in sediments from the Matanza River and its main affluents. Sequential fractionation was applied to partition heavy metals in river sediments taken from the Matanza-Riachuelo basin. Although there was observed a considerable variation among the heavy metals in the proportion of various fractions, Pb showed a similar distribution pattern between the four sampling sites. The organic matter/sulfides fractions of this metal strongly dominated over the other fractions. The speciation of Cu showed a relative high percentage of carbonates and organic mater/sulfides fractions. Zinc showed a high proportion of Fe-Mn oxides. Cadmium was only detected in Cañuelas stream sediments and existed in the exchangeable and carbonates fraction showing a high potential mobility of this element.
Highlights
La mayor parte de los metales pesados presentes en sistemas acuaticos estin unidos a particulas del material en suspensi6n y de 10s sedimentos dei fondo de 10s cauces
1997; Perin et al, 1997), en cambio en nuestro pais, hasta el momento hay pocos antecedentes en el tema (Alvarez et al, 1996; Ferrer et al, 1996; Rendina et al, 1997)
En la cuenca del ltfo Matanza-Riachnelo, se han realizado monitoreos en agua y sedimento que mostraron un gsan deterioro en la parte media y baja de la cuenca
Summary
La mayor parte de los metales pesados presentes en sistemas acuaticos estin unidos a particulas del material en suspensi6n y de 10s sedimentos dei fondo de 10s cauces. El unico sitio eon contenidos elevados de Cd fue S3 (Fig. 2d) donde el contenido total excedi6 el valor limite de referencia, siendo el orden de distribucion entre 18s fraccioncs el siguiente: intercambiable y carbonatos>residual, resultando no detectables las otras dos fracciones.
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