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• W1564946543 abstract "RESUMEN: se evaluaron los contenidos biodisponibles de zinc, hierro, manganeso, cobre, cromo, cadmio, plomo y niquel en sedimentos superficiales entre 10-20 cm. de profundidad en 10 estaciones de muestreo de la laguna Bocaripo y 10 estaciones de muestreo de la laguna Chacopata, usando espectrofotometria de absorcion atomica. Ademas, se evidencio la importancia de la influencia que pueden tener los contenidos de las particulas, segun sus diametros; el contenido de materia organica total y el pH de los sedimentos sobre las concentraciones biodisponibles de metales traza en los periodos climaticos: finales de lluvia (Nov. 2003), sequia (Mar. 2004) y lluvia (Jul. 2004). Para sedimentos superficiales de la laguna Bocaripo se determinaron contenidos promedios de metales traza biodisponibles (mg/kg. masa seca) de Fe (62,15), Zn (5,13), Cd (0,05), Cr (0,15) y Ni (0,04) que fueron mayores a los obtenidos para la laguna Chacopata, la cual presento concentraciones mas elevadas de Pb (6,30), Mn (5,72) y Cu (0,32). Se observaron diferencias estadisticas significativas para Fe, Pb y Mn entre los periodos climaticos estudiados en la laguna Bocaripo; no obstante, Cr y Mn fueron estadisticamente diferentes entre estaciones de muestreo, lo que tambien fue observado en la laguna Chacopata para las concentraciones de Fe, Cu, Mn y Zn. El contenido biodisponible de hierro en la laguna Bocaripo puede representar un riesgo potencial de contaminacion, ya que en ambientes muy reductores pueden afectar la movilidad de otros metales hacia la solucion por crear condiciones mas oxidantes que conllevan a acidificar fuertemente el ambiente. Palabras claves: Metales traza, sedimentos, laguna costera. ABSTRACT: Atomic absorption spectrophotometry was used to assess the bioavailable contents of zinc, iron, manganese, copper, chromium, cadmium, lead, and nickel in surface sediments taken at a depth between 10 and 20cm from 10 sampling stations at Laguna de Caripo and 10 sampling stations at Laguna de Chacopata. The diameter of the particles, the total organic content, and the pH of the sediments have an important influence on the bioavailable levels of trace metals, as evidenced at the end of the rainy season in November 2003, at the peak of the dry season in March 2004, and at the onset of the rainy season in July 2004. The mean concentration of Fe, Zn, Cd, Cr, and Ni (62.15, 5.13, 0.05, 0.15, and 0.04 mg/kg of dried mass, respectively) was higher in Bocaripo than that of the same elements in Chacopata, where Pb, Mn, and Cu yielded higher concentrations (6.30, 5.72, and 0.32 mg/kg of dried mass, respectively). Significant statistical differences were observed for the Fe, Pb, and Mn of the Bocaripo Lagoon as seen from one climatic period to another, whereas Cr and Mn were statistically different among sampling stations, a phenomenon also observed in the Chacopata Lagoon for the concentrations of Fe, Cu, and Zn. The bioavailable content of Fe in the Bocaripo Lagoon could represent a potential polluting risk as, in very reducing environments, it can affect the mobility of other metals towards the solution by creating oxidizing conditions that prompt a strong acidification response. Key words: Trace metals, silts, coastal lagoon." @default.
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• W1564946543 date "2006-01-01" @default.
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• W1564946543 title "Biodisponibilidad de metales traza en sedimentos superficiales del ecosistema lagunar costero Bocaripo-Chacopata (Península de Araya, Estado Sucre)" @default.
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