Se estudiaron las concentraciones de metales pesados Co, Cr, Pb y Zn en la fracción biodisponible en sedimentos superficiales de la región marino-costera de la ciudad de Cumaná, Venezuela, durante los periodos de sequía y de lluvia, en 17 estaciones de muestreo distribuidas a lo largo de la costa. Se encontraron diferencias significativas entre los dos periodos de muestreo para cromo y plomo, los cuales registraron sus máximas concentraciones durante la temporada de lluvia. Para el resto de los metales estudiados se encontró un comportamiento similar en ambas épocas. Se observaron diferencias significativas para cromo y plomo, detectándose un mayor enriquecimiento de este último hacia la zona de alta influencia del río.Palabras clave: disponibilidad; metales pesados; sedimentos; zona costera. AbstractThe concentrations of heavy metals Co, Cr, Pb and Zn in the bioavailable fraction in surface sediments of marinecoastal region of the city of Cumana, Venezuela, were studied during periods of drought and rain, in 17 sampling stations located along the shoreline. Significant differences between the two periods of sampling were detected for chromium and lead concentrations, reaching the highest values during the rainy season. For the rest of the metals studied a similar behavior was found for both periods. Likewise, significant differences were observed for chromium and lead, showing a greater enrichment of the latter in the area of high river influence.
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