This paper reports on the speciation of Fe, Mn, Ni, and Pb in the matter suspended in the superficial waters ofthe low basin and the surface trapped plume of the Manzanares river, in Cumaná, state of Sucre, Venezuela, by studyingsediment and water samples taken at 22 stations deployed throughout this area of influence between July 1996 and June 1997.The suspended matter increased during the rainy season (July to November), reaching a maximum value in September, at 1075mg/L. The heavy m...