Spatial distribution of iron, copper and lead in mangrove sediments in a degradation gradient in Guanabara Bay (Rio de Janeiro State)

Quimica nova

Machado, Wilson¹  Patchineelam, Sambasiva R.¹  Sella, Silvia M.¹  Dias, Jailson C.¹  Borges, Anderson C.¹ 

[1] Universidade Federal Fluminense, Niterói, Brasil

关键词: trace metals;    contamination;    mangrove sediments.;   

DOI  :  10.1590/S0100-40422007000100015

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Iron, copper andlead distribution was evaluated in sediment cores from a disturbed mangrovearea in Guanabara Bay: a core from a seaward site where mangrove vegetationwas removed ~20 yr before sampling (MD); a core from an intermediate site withdead vegetation, apparently due to insect attack (MP), and a core from a landwardsite with living vegetation (MV). Metal concentrations showed increasing valuesseaward while organic matter content showed an inverse trend, displaying a negativecorrelation with metals. This unusual correlation indicates opposite sources,since metals come from the bay and the main OM origin is probably degraded mangrovevegetation. 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