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.
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