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BIBTEX RIS

Non-aromatic hydrocarbons in recent sediments of Sepetiba and Ilha Grande Bays, Brazil

2008; Brazilian Chemical Society; Volume: 19; Issue: 3 Linguagem: Inglês

10.1590/s0103-50532008000300020

ISSN

1678-4790

Autores

Luis Henrique Melges Figueiredo, Ângela de Luca Rebello Wagener, J. Dagaut, A. Saliot,

Tópico(s)

Toxic Organic Pollutants Impact

Resumo

An investigation was conducted in Ilha Grande and Sepetiba Bays aiming at identifying the nature of non-aromatic hydrocarbons (NAH) in surface sediments. NAH concentrations ranged from 2.5 µg g-1 to 193.8 µg g-1 of which the major fraction (53 to 93%) was composed by unresolved complex mixture (UMC). In most samples n-alkane distribution was dominated by compounds of odd carbon number showing maxima in nC29 and nC31. Mono-olefins were at low concentrations and the polyolefins including highly branched isoprenoids and squalene varied from 0.099 µg g-1 to 1.387 µg g-1 with lower values relative to NAH appearing in areas of strong terrestrial and anthropogenic influence. Hopanes between C27 and C33 were observed in all samples with the predominant configuration 17a(H),21b(H), characteristic of a petrogenic origin.

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