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Analytical Letters Volume 41, 2008 - Issue 9
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CHEMICAL SPECIATION

Different Species of Mercury in the Livers of Tropical Dolphins

H.A. Kehrig Laboratório de Radioisótopos Eduardo Penna Franca, IBCCF, Universidade Federal do Rio de Janeiro Brazil, Correspondence[email protected]
,
T.G. Seixas Departamento de Química, PUC-Rio, Brazil
,
E.A. Palermo Laboratório de Radioisótopos Eduardo Penna Franca, IBCCF, Universidade Federal do Rio de Janeiro Brazil,
,
A.P.M. Di Beneditto Laboratório de Ciências Ambientais, CBB, Universidade Estadual Norte Fluminense, Brazil
,
C.M.M. Souza Laboratório de Ciências Ambientais, CBB, Universidade Estadual Norte Fluminense, Brazil
&
O. Malm Laboratório de Radioisótopos Eduardo Penna Franca, IBCCF, Universidade Federal do Rio de Janeiro Brazil,
Pages 1691-1699 | Received 11 Oct 2007, Accepted 28 Feb 2008, Published online: 17 Jul 2008
 
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Abstract

Four kinds of mercury species (inorganic mercury (Hginorg), methylmercury (MeHg), total organic mercury (ΣHgorg), and insoluble mercury, deemed to be mercuric selenide (HgSe), were determined in the livers of dolphins from the Brazilian coast. The MeHg was identified and quantified in the toluene layer on a Gas Chromatograph with an Electron Capture Detector (GC-ECD). The ΣHgorg was isolated by acid leaching (H2SO4-KBr-CuSO4) and then extracted into CH2Cl2. The ΣHgorg and Hginorg were determined by Cold-Vapor Atomic Absorption Spectroscopy (CV-AAS). The MeHg was the smallest fraction of Hgtot, with a median of 9%, whereas the highest fraction of the Hgtot was as HgSe, corresponding to 53%. The fractions of Hginorg and ΣHgorg corresponded to 30% and 39%, respectively. The lowest fraction of MeHg and the highest fraction of HgSe in the liver of all animals are related to different capacities or strategies of detoxification of methylmercury in this organ.

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