Black carbon contents and distribution in sediments from the southeastern Brazilian coast (Guanabara Bay)

Journal of the Brazilian Chemical Society

Letícia G. L. Ribeiro²  Renato S. Carreira¹  Angela L. R. Wagener² 

[1] ,Pontifícia Universidade Católica do Rio de Janeiro Departamento de Química Rio de Janeiro RJ ,Brazil

关键词: black carbon;    organic carbon;    sediments;    Guanabara Bay;   

DOI  :  10.1590/S0103-50532008000700008

来源: SciELO

【 摘 要 】

The concentration of black carbon (BC), as well as the relative contribution of BC to total organic carbon, was determined for the first time in sediments from Guanabara Bay. BC was quantified by a thermal oxidation method (CTO-375) and total organic carbon by dry oxidation. Sedimentary organic carbon showed a large range in concentrations (0.82 to 10.3%), but it was possible to define distinct regions of the Bay accordingly to variations in sediment grain size, location and magnitude of allochthonous and autochthonous sources of organic matter and hydrodynamic features. Low concentrations of BC were observed (0.03 to 0.31%, with a mean of 0.19 ± 0.07%, n = 25) when considering the large spectrum of possible sources on land and at sea. However, in some stations levels are sufficiently high as to influence the fate of pollutants of concern, such as PAH and dioxins. The space distribution of BC concentrations in Guanabara Bay cannot be fully understood at this stage since further information on contributions from various sources and on natural dispersion processes are required.

【 授权许可】

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