Lead distribution and isotope signature in bottom sediments of Guama River and Guajara Bay (Belem - Para)

Química Nova

Universidade Federal do Pará, Belém, Brasil¹  Universidade de São Paulo, São Paulo, Brasil¹  Santos, Suziane Nascimento¹  Corrêa, José Augusto Martins¹  Lafon, Jean Michel¹  Dias, Fabiana Ferrari¹  Laboratório de Poços de Caldas, Poços de Caldas, Brasil¹  Taddei, Maria Helena Tirolo¹  Babinski, Marly¹ 

关键词: Bottom sediments;    Pb isotopes;    Belem - PA.;   

DOI  :  10.1590/S0100-40422012000200004

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Lead analyses in bottom sediments from the hydrographic system of Belem (Para) indicated low contents of this metal for the sediments from the Guama river, with no significant anthropogenic contribution. A concentration of 18.1 ± 1.5 mg kg-1 and 206Pb/207Pb isotopic signature of 1.196 ± 0.002 are assigned for Pb from natural sources. On the other hand, the significant increase of Pb contents in the sediments from the Guajará bay, together with the decrease of 206Pb/207Pb ratios (1.172 < 206Pb/207Pb < 1.188) point to an anthropogenic lead contribution, originated by the industrial and urban activities of the city of Belem.

【 授权许可】

Unknown