Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/5284
metadata.dc.type: Artigo de Periódico
Issue Date: Feb-2007
metadata.dc.creator: LEMOS, Vanda Porpino
COSTA, Marcondes Lima da
LEMOS, Ronaldo Lima
FARIA, Mario Sergio Gomes de
Title: Vivianite and siderite in lateritic iron crust: an example of bioreduction
Citation: LEMOS, Vanda Porpino et al. Vivianite and siderite in lateritic iron crust: an example of bioreduction. Química Nova, São Paulo, v. 30, n. 1, p. 36-40, jan./fev. 2007. Disponível em: <http://www.scielo.br/pdf/qn/v30n1/07.pdf>. Acesso em: 28 fev. 2014. <http://dx.doi.org/10.1590/S0100-40422007000100008>.
Abstract: Lateritic iron crust (LIC) samples from Padauari (AM) were analysed by XRD, optical microscopy and SEM-EDS. The equilibrium of iron minerals (IM) was studied using Eh-pH diagram. It was shown that the minerals of the LIC are goethite (a-FeOOH), vivianite [Fe3(PO4)2.8H2O] and siderite (FeCO3). Carbonate grains are a solid solution of FeCO3-MnCO3. The LIC presents textures and structures of dissolution of IM. The siderite and vivianite are stable from Eh =-0.3 to 0.0 V and pH=5.0-7.5. These results indicate that vivianite and siderite are products of bioreduction through biogenic dissolution of IM, the new conditions of ecosystems of the Amazon region.
Keywords: Minérios de ferro
Vivianite
Siderita
Ferro laterítico
Bioredução
Difração de raio X
Microscopia ótica
Goetite
Amazônia brasileira
ISSN: 0100-4042
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - IG

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