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

Quimica nova

Dias, Fabiana Ferrari¹  Taddei, Maria Helena Tirolo¹  Santos, Suziane Nascimento²  Lafon, Jean Michel²  Corrêa, José Augusto Martins²  Babinski, Marly³ 

[1] Laboratório de Poços de Caldas, Poços de Caldas, Brasil;Universidade Federal do Pará, Belém, Brasil;Universidade de São Paulo, São Paulo, Brasil

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

【 授权许可】

CC BY