Sources and distribution of sedimentary organic matter in the Mundaú-Manguaba estuarine-lagoon system (State of Alagoas) using sterols and alcohols as indicators

Quimica nova

Ribeiro, Maria Antonia T. S. B¹  Knoppers, Bastiaan A¹  Carreira, Renato S² 

[1] Universidade Federal Fluminense, Niterói, Brasil;Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil

关键词: sediment;    organic matter;    molecular markers.;   

DOI  :  10.1590/S0100-40422011000700002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

CC BY