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Master's Dissertation
DOI
10.11606/D.21.2002.tde-31032004-103641
Document
Author
Full name
César de Castro Martins
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2001
Supervisor
Committee
Montone, Rosalinda Carmela (President)
Bicego, Marcia Caruso
Silva, Mary Rosa Rodrigues de Marchi Santiago da
Title in Portuguese
"Avaliação de introdução de esteróis fecais e hidrocarbonetos marcadores geoquímicos em sedimentos da Baía do Almirantado, Península Antártica"
Keywords in Portuguese
Antártica
Baía do Almirantado
esgoto
esteróis
hidrocarbonetos
sedimentos
Abstract in Portuguese
Esgoto e hidrocarbonetos provenientes de atividades humanas são as principais fontes de poluição para o meio ambiente marinho antártico. Esteróis e hidrocarbonetos como n-alcanos, policíclicos aromáticos (PAHs) e alquilbenzenos lineares (LABs) foram investigados em sedimentos superficiais coletados na Baía do Almirantado, Antártica durante o verão de 1997/1998 e 1999/2000. Estes compostos são citados como traçadores de dejetos humanos e introdução de óleos ao longo de áreas costeiras de todo o mundo. As técnicas analíticas utilizadas foram a cromatografia a gás com detector de ionização de chama (GC-FID) e espectrômetro de massa (GC-MS). Análises de esteróis indicaram que o esgoto atinge até 700 metros desde a saída de efluentes, mas somente o ponto de descarga pode ser considerado poluído. Dados de LABs concordaram com os resultados obtidos para os esteróis indicando que dejetos humanos chegam até 1 Km desde a estação brasileira e que esteróis encontrados em pontos distantes são provenientes de fontes naturais. Os níveis obtidos para n-alcanos e PAHs foram similares àqueles obtidos em outros estudos envolvendo regiões antárticas. Contribuições biogênicas e pequenas introduções antropogênicas são as fontes dos n-alcanos detectados. PAHs encontrados em pontos distantes são associados como pequena contribuição de óleos enquanto que amostras coletadas na saída de esgoto e até 50 metros apresentam PAHs de origem pirolítica ou de esgotos. Este estudo concluiu que apenas a saída de efluentes pode ser considerada ponto altamente poluído e verificou a presença de uma substancial diminuição do aporte de esgoto com o aumento da distância desde a fonte.
Title in English
Evaluation of fecal sterols and geochemical markers hydrocarbons in sediments from Admiralty Bay, Antartica.
Keywords in English
Admiralty Bay
Antarctica
hydrocarbons
sediments
sewage
sterols
Abstract in English
Sewage and oil contribution are the main sources of pollution from the scientific stations to the antarctic marine environment. Sterols and hydrocarbons such as n-alkanes, polyciclic aromatics (PAHs) and linear alkylbenzenes (LABs) were investigated on surface sediments from Admiralty Bay, King George Island, Antarctica, collected during austral summer of 1997/1998 and 1999/2000 It has been previously used as a tracer from human waste and oil inputs along the coastal areas around the world. The analytical techniques used were gas chromatography with flame ionization detection (GC-FID) or attached with a mass spectrometer (GC-MS). Analyses of sterols showed that sewage moves until 700 meters since sewer outfall, but only the discharge point can be considered polluted. Data from LABs agreed with sterols results indicating that human wastes arrive until 1 Km from brazilian station and sterols found in remote areas were from natural contributions. N-alkanes and PAHs showed the same levels than previous studies from pristine areas in antarctic continent. Biogenic and little antropogenic sources are the origins from n-alkanes. PAHs found in distant points are associated with small oil contribution while samples collected in sewer outfall and until 50 meters far presented PAHs from combustion process and sewage. This study concluded that only the sewage discharge point is very polluted however there is a substantial sewage input decrease with the increase of distance from outfall.
 
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Figs_22_23_24_25.pdf (113.28 Kbytes)
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MSC_TEXT_CESAR.pdf (3.05 Mbytes)
Papers_MSC.pdf (60.05 Kbytes)
Publishing Date
2004-04-28
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • BíCEGO, Márcia C., et al. Results from a 15-year study on hydrocarbon concentrations in water and sediment from Admiralty Bay, King George Island, Antarctica [doi:10.1017/S0954102009001734]. Antarctic Science [online], 2009, vol. 21, n. 3, p. 209.
  • MARTINS, C.C., et al. Aliphatic and polycyclic aromatic hydrocarbons in surface sediments in Admiralty Bay, King George Island, Antarctica [doi:10.1017/S0954102004001932]. Antarctic Science [online], 1999, vol. 16, n. 2, p. 117-122.
  • MARTINS, C.C., VENKATESAN, M.I., and MONTONE, R.C.. Sterols and linear alkylbenzenes in marine sediments from Admiralty Bay, King George Island, South Shetland Islands [doi:10.1017/S0954102002000093]. Antarctic Science [online], 2002, vol. 14, n. 3.
  • MARTINS, César de Castro, et al. Sterols and fecal indicator microorganisms in sediments from Admiralty Bay, Antarctica [doi:10.1590/S1679-87592005000100001]. Brazilian Journal of Oceanography [online], 2005, vol. 53, n. 1-2, p. 1-12.
  • MONTONE, Rosalinda C., et al. Distribution of sewage input in marine sediments around a maritime Antarctic research station indicated by molecular geochemical indicators [doi:10.1016/j.scitotenv.2010.07.012]. Science of The Total Environment [online], 2010, vol. 408, n. 20, p. 4665-4671.
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