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Hydrocarbons in sediments of a chronically contaminated bay: The challenge of source assignment

2011; Elsevier BV; Volume: 64; Issue: 2 Linguagem: Inglês

10.1016/j.marpolbul.2011.11.018

1879-3363

Ângela de Luca Rebello Wagener, Maria de Fátima Guadalupe Meniconi, Cláudia Hamacher, Cássia de Oliveira Farias, Gilson C. da Silva, Irene Terezinha Gabardo, Arthur de L. Scofield,

Effects and risks of endocrine disrupting chemicals

Aliphatic hydrocarbons and 39 PAH (parental and alkylated homologs) determined in ca. 100 sediment samples from the Guanabara Bay, Rio de Janeiro, were evaluated for source discrimination using new approaches. Concentrations of total PAH were in the range of 96-135,000 μg kg(-1) similar to other coastal urbanized embayment. Traditional diagnostic ratios were not as efficient PAH source indicators, e.g. biomass combustion was assigned as the major source of the pyrolytic PAH although the hydrographic basin is highly industrialized and urbanized. It is proved petrogenic imprint cannot be detected if only the 16 USEPA PAH are determined. The high production in the eutrophic system is not apparent in the aliphatic fraction dominated by land derived n-alkanes due to the effectiveness of microbial degradation. The present work demonstrates the complexity of hydrocarbon forensics when applied to chronically contaminated environments.