[en] Perfluorooctane sulfonate (PFOS) and other perfluoroalkyl
compounds (PFCs) were measured in liver samples from 29
marine tucuxi dolphins from Rio de Janeiro state (RJ), Brazil. PFC
measurement combined liquid chromatography and mass
spectrometry, using a CapLC system connected to a Quadrupole-
LIT mass spectrometer. PFOS was the only PFC detected
and it was so in all samples. PFOS concentrations (ng ·g-1
dw) of dolphins (n)23) from the highly contaminated Guanabara
Bay (in RJ) varied between 43 and 2431 as well as between
76 and 427 from areas of RJ other than the quoted bay (n ) 6).
Concentrations of three fetuses and one neonate varied
between 664 and 1590. Fetus/mother ratios were calculated in
two situations (2.75 and 2.62). It seems that mother-to-calf
transference plays important role for relationships between
PFOS and age. When a one-year-old male calf presenting 2431
ng ·g-1 dw was excluded from the test, significant correlations
were observed between PFOS concentrations and both
age and total length. Despite the placental transference, PFOS
concentrations were not significantly lower in females than
in males. PFOS levels in marine tucuxi dolphins from Guanabara
Bay are among the highest detected to date in cetaceans,
andthismayrepresentathreat to the small population concerned.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] CAPES - Coordenação de Aperfeicoamento de Pessoal de Nível Superior [BR] CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico [BR] FAPERJ - Carlos Chagas Filho Foundation for Research Support of Rio de Janeiro State [BR]
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