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The objective of this research was to assess the total metal content and bioavailability ofthese elements in the sediment of the Duck‘ lagoon (Laguna Los Patos), Sucre state, Venezuela.By using extractions with HNO3: HClO4: HCl in 3:1:1 ratio to total metals and acetic acid to 10%for the bioavailable fraction, was determined by atomic absorption spectrometry with air acetyleneflame, that total metals show at their peak concentrations (μg/g), a descending order: Fe (1304.13) > Mn (177.14) > Zn (31.74) > Pb (12.62) > Cu (10.27 )> Cr ( 5.92) > Cd (0.56), associatedwith the particles of the kind of mud. The lagoons presents a deterioration with focus oflead pollution in the central part and copper, nickel and lead towards the far south, where asewage treatment plant is located. Iron, manganese, copper, zinc and nickel are in the bioavailablefraction with values between 2.01-99.62%; 12.00-52.82%; 4.53- 18.88%; 26.52-45.91% y2.93-91.59% respectively, of the total of each present metal in the sediment. The heterogeneityobserved in the distribution of residual and bioavailable fractions, reflects a wide variability ofthe sedimentary matrix. Moreover, the presence of these five metals in the bioavailable fractionshows a progressive risk for biota of the lagoon, due to the ability of these elements to bioaccumulatein organisms, suggesting a magnification of these impacts in the future, under the weakflow of the waters of this ecosystem

Metales totales y biodisponibles en sedimentos recientes de la laguna Los Patos, estado Sucre, Venezuela