title: Source and distribution of organic matter in surface sediments from mangroves on the island of Itaparica, Bahia/Brazil.
abstract: Elemental analysis and isotopic composition evaluated the impact of human activity at the surface sediments in the largest island of Todos os Santos Bay, northeastern Brazil. Saturated hydrocarbons (n-alkanes and isoprenoids) by gas chromatography coupled with a flame ionization detector and (13)C by mass spectrometer were determined from 30 surface sediment samples in mangroves at the Itaparica Island (Bahia-Brazil) in the rainy and dry season. These data, distribution, and ratio of carbon/nitrogen showed a mixture of sources: continental, marine, and anthropogenic ones. From the chromatographic profiles, light oil contamination was observed in the dry regions of Baiacu, Campinas, and Ponta Grossa, while in Jiribatuba it was observed during the rainy season. However, δ(13)C results during dry and rainy season in the presence of oil also showed in Misericordia and Cacha Prego districts for both periods and Ponta Grossa during the rainy season. Principal component analysis, using a correlation matrix, revealed the latent relationships among all the surface sediment stations investigated and confirmed our analytical results.
authors.affiliation: Instituto de Geociências, Núcleo de Estudos Ambientais, Universidade Federal da Bahia, Rua Barão de Geremoabo, Campus Ondina, 40170-290, Salvador, Bahia, Brazil, eliscsantos@yahoo.com.br.
authors.forename: Elisângela Costa
authors.initials: EC
authors.lastname: Santos
authors.forename: Joil José
authors.initials: JJ
authors.lastname: Celino
authors.forename: Vera Lúcia Cancio Souza
authors.initials: VL
authors.lastname: Santos
authors.forename: José Roberto
authors.initials: JR
authors.lastname: Bispo De Souza
mesh_terms: D001938:Brazil; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical