Examinando por Materia "Continental fishes"

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    Relación molar Se:Hg en peces continentales en el norte de Colombia
    (Universidad de Córdoba, 2022-01-25) Padilla Ramírez, Camila Alejandra; Marrugo Negrete, José Luis
    Heavy metal pollution mainly by Hg in aquatic ecosystems has great spot due the adverse effects and toxicity of Hg by anthropogenic emissions. Therefore, the presence of mercury (Hg) in its different forms (organic, elemental and mineral) poses as a great concern since it leads to bioaccumulation and biomagnification processes in the environmental composition. On the other hand, Selenium (Se) is known to be an essential micronutrient in biota and fish metabolism, but in high concentrations can generate toxicity instead. Therefore, this work determined Hg and Se concentrations and their relations and distribution in continental fishes in North of Colombia. 308 individuals from 30 species were analyzed in six study areas (Ayapel swamp, Embalse del Guájaro, Represa El Cercado, Río Ranchería, Riosucio and Unguía). Hg was quantified by the EPA-7473 method (thermal decomposition, amalgamation/atomic absorption spectrometry) in a DMA-80 direct mercury analyzer, and Se was determined by EPA-3052 method HG (hydride generation atomic fluorescence spectrometry). To evaluate relations among Hg and Se general concentrations, body mass and total length in muscle of sampled fishes, Pearson's correlation coefficients (p