Fontes e distribuição de matéria orgânica sedimentar no complexo estuarino-lagunar de Mundaú-Manguaba/AL, utilizando esterois e alcoóis como indicadores

Química Nova

Maria Antonia T. S. B Ribeiro¹  Bastiaan A Knoppers¹  Renato S Carreira² 

[1] ,Universidade Federal Fluminense Departamento de Geoquímica Niterói RJ ,Brasil

关键词: sediment;    organic matter;    molecular markers;   

DOI  :  10.1590/S0100-40422011000700002

来源: SciELO

【 摘 要 】

The origin of the sedimentary organic matter in the Mundaú-Manguaba estuarine system was evaluated through the distribution and composition of sterols, alcohols and ancillary data. The muddy sediments of the lagoons are enriched in organic matter, derived from a mixture of autochthonous and allochthonous inputs. Mundaú exhibited moderate contamination by sewage, with coprostanol concentration as high as 4.4 µg g-1. The channels are characterized by sand and organic matter-poor sediments. The sediments from some rivers in the drainage basin accumulated organic matter derived only from terrestrial vegetation. Stanol/sterol ratios evidenced the preferential diagenesis of the autochthonous fraction of organic matter.

【 授权许可】

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