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Selenium and mercury concentrations in some fish species of the Madeira River, Amazon Basin, Brazil

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Abstract

Samples of 7 species of piscivorous, omnivorous, and herbivorous fish caught at 12 different sites on the Madeira River, Amazon Basin, were analyzed for selenium and mercury. Selenium was determined by anodic stripping voltammetry and mercury by cold vapor atomic absorption spectrophotometry. The means for selenium concentrations ranged from 0.49 to 3.11 nmol/g and for mercury from 0.41 to 6.66 nmol/g depending on the fish species. The molar ratios of Hg:Se increased according to the fish trophic level. Piscivorous species had the highest mean ratio (4.0) and herbivorous species the lowest (0.9). There was a positive and statistically significant correlation between selenium and mercury concentrations for the herbivorous species (r = 0.716;p = 0.0088) not seen for omnivororus and piscivorous species (r = -0.2032;p = 0.3407). These findings are significant for the fish-eating population of the Madeira River because the ingestion of mercury would always be in excess of selenium.

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Dorea, J.G., Moreira, M.B., East, G. et al. Selenium and mercury concentrations in some fish species of the Madeira River, Amazon Basin, Brazil. Biol Trace Elem Res 65, 211–220 (1998). https://doi.org/10.1007/BF02789097

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  • DOI: https://doi.org/10.1007/BF02789097

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