Artículos de revistas
Determination of Hg and diet identification in otter (Lontra longicaudis) feces
Fecha
2008Registro en:
ENVIRONMENTAL POLLUTION, v.152, n.3, p.592-596, 2008
0269-7491
10.1016/j.envpol.2007.06.065
Autor
JOSEF, Carla Ferreira
ADRIANO, Leonardo Ramos
FRANCA, Elvis Joacir De
CARVALHO, Gabriel Gustinelli Arantes de
FERREIRA, Jose Roberto
Institución
Resumen
An analytical procedure for the determination of Hg in otter (Lontra longicaudis) feces was developed, to separate fish scales for the identification of the animal diet. Samples were washed with ultra-pure water and the suspension was sampled and transferred for digestion. The solubilization was performed with nitric-perchloric acid mixture, and detection carried out by the atomic fluorescence spectrometry (AFS). The quality of the analytical procedure was assessed by analyzing in-house standard solutions and certified reference materials. Total Hg concentrations were in the range of 7.6-156 ng g(-1) (July 2004), 25.6-277 ng g(-1) (January 2005) and 14.6-744 ng g(-1) (May 2005) that is approximately the same order of magnitude for all samples collected in two reservoirs at the Tiete River, Brazil. Although Hg concentrations varied with sampling periods and diet, high levels were correlated to the percentage of carnivorous fish scales present in the otter feces. (c) 2007 Elsevier Ltd. All rights reserved.