Distribuição espacial de ferro, cobre e chumbo em sedimentos de manguezal em um gradiente de degradação na Baía de Guanabara (Estado do Rio de Janeiro)

Química Nova

Anderson C. Borges²  Jailson C. Dias²  Wilson Machado²  Sambasiva R. Patchineelam²  Silvia M. Sella¹ 

[1] ,Universidade Federal Fluminense Instituto de Química Departamento de GeoquímicaNiterói RJ ,Brasil

关键词: trace metals;    contamination;    mangrove sediments;   

DOI  :  10.1590/S0100-40422007000100015

来源: SciELO

【 摘 要 】

Iron, copper and lead distribution was evaluated in sediment cores from a disturbed mangrove area in Guanabara Bay: a core from a seaward site where mangrove vegetation was removed ~20 yr before sampling (MD); a core from an intermediate site with dead vegetation, apparently due to insect attack (MP), and a core from a landward site with living vegetation (MV). Metal concentrations showed increasing values seaward while organic matter content showed an inverse trend, displaying a negative correlation with metals. This unusual correlation indicates opposite sources, since metals come from the bay and the main OM origin is probably degraded mangrove vegetation. Plant cover loss seems to be a critical factor affecting metal accumulation, particularly due to changes in OM input.

【 授权许可】

CC BY-NC   
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