Degradação de naftaleno, fenantreno e benzo(a)pireno em solos e sedimentos de ambientes costeiros, oceânicos e antárticos / Degradation of naphthalene, phenanthrene e benzo(a)pyrene in soil and sediments of coastal, oceanic and Antarctic environments

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Petroleum is the main source of fuel, and the operations of exploration, transportation, refining and distribution are potential sources of environmental pollution. In contaminated environments, the degradation of PAHs (Polycyclic Aromatic Hydrocarbons) depends on climatic factors, soil and microbial population. This study aimed to assess the potential for degradation of naphthalene, phenanthrene and benzo (a) pyrene hydrocarbons in different soils and sediments from coastal regions, both tropical and polar (Antarctica). The samples were collected in three regions, and (1) main island in the archipelago of Fernando de Noronha, (2) in the Prado coast, in southern Bahia, and (3) Islands in the South Shetlands archipelago, Antarctica. After obtaining samples of TFSA (Earth Thin Air Dried), the soils were submitted to physical and chemical analysis, and experiments were set to evaluate the degradation through respirometry, and tested the PAHs naphthalene, phenanthrene and benzo (a) pyrene. Most degradation of naphthalene was observed in soil contaminated by oil derived from oil, in Fildes (Antarctica), which was attributed to the selection of microbial populations in the efficient use of HC. The rates of degradation of phenanthrene and benzo (a) pyrene were lesser in comparison to naphthalene, which have lower molecular weight and greater solubility. The results of this study suggest that the microorganisms present in these soils, wherever there was no impact of oil spill, were not able to efficiently degrade the oil naphthalene, phenanthrene and benzo (a) pyrene, in experimental conditions tested. That would, after selection, the use of these microorganisms (adapted), the remediation of contaminants soluble in other similar areas of Antarctica. The differences between the rates of degradation of hidrocarbons relate to the levels of TOC (Total Organic Carbon) and TN (Total Nitrogen) soil of local noncontaminated.

ASSUNTO(S)

biodegradação antártica biodegradation naftaleno antarctic phenanthrene fenantreno naphthalene ciencia do solo

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