Hydrocarbons and sterols as indicators of source and fate of organic matter in sediments from Sepetiba Bay, Rio de Janeiro

Química Nova

Carreira, Renato S.¹  Silva, Carlos E. M.¹  Ribeiro, Patrícia V.¹  Farias, Cassia O.¹  Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brasil¹  Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil¹ 

关键词: Sepetiba Bay;    sediments;    organic matter.;   

DOI  :  10.1590/S0100-40422009000700023

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The inputs of organic matter derived from natural and anthropogenic sources to Sepetiba Bay were investigated by using aliphatic hydrocarbons and sterols in superficial sediments. Concentrations ranged from 0.26 to 2.65 μg g-1, <0.01 to 17.41 μg g-1 and 0.77 and 9.24 μg g-1 for n-alkanes, UCM (unresolved complex mixture) and total sterols, respectively. The selected markers and ratios among individual compounds showed the major contribution of terrestrial sources to the total pool of sedimentary organic matter in the bay, but the accumulation of autochthonous organic matter increased with distance from the shoreline. The input of petroleum hydrocarbons and sewage (coprostanol in the range 0.01 to 0.43 μg g-1) were also detected, especially in the more urbanized regions of the bay, but at lower levels of contamination when compared to estuaries in other Brazilian coastal regions.

【 授权许可】

Unknown