Occurrence of chlorinated pesticides and polychlorinated biphenyls (PCBs) in Guiana dolphins (<i>Sotalia guianensis</i>) from Ubatuba and Baixada Santista, São Paulo, Brazil


  • M. B. Alonso
  • J. Marigo
  • C. P. Bertozzi
  • M. C. O. Santos
  • S. Taniguchi
  • R. C. Montone




Organochlorine pesticides and polychlorinated biphenyls (PCBs) were determined in the blubber of six Guiana dolphins (Sotalia guianensis) from the coast of the state of São Paulo, Brazil. PCBs were at the highest levels on a lipid-weight basis (25.87 to 66.03μg g-1), followed by DDTs (16.91 to 55.91μg g-1), mirex (0.24 to 1.87μg g-1), chlordanes (0.11 to 0.49μg g-1), hexachlorobenzene (HCB) (0.07 to 0.17μg g-1), heptachlor epoxide (0.05 to 0.16μg g-1) and hexachlorociclohexane (HCHs) (0.03 to 0.21μg g-1). The presence of PCBs in Guiana dolphins suggests input from the Cubatão industrial complex – the largest in Brazil. The mean p,p’-DDE/3DDT ratio was approximately 0.8 and is indicative of previous DDT application in the study area. The occurrence of HCB and HCHs can be attributed to industrial effluents and dumping on the borders of the Santos-São Vicente estuarine complex.