Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/104891
Type: Artigo de periódico
Title: Environmental Monitoring Of Magnetic Iron Phases Of Urban Water Reservoir Lake Sediments (taiaçupeba Lake, Metropolitan Region Of São Paulo, Brazil) By Using Mössbauer Spectroscopy
Author: Franco D.R.
Berquo T.S.
Imbernon R.A.L.
Partiti C.S.M.
Enzweiler J.
Abstract: In the present work, we investigate the iron oxides and oxyhydroxides behavior and evolution, related to the geochemical behavior of some metals, which could be retained as solid phases in the sediments from an urban water reservoir lake, placed in Taiaçupeba, Great São Paulo, Brazil. These tasks were performed by the establishment of a proceduring setting for environmental monitoring analysis through Mössbauer spectroscopy measurements associated to hysteresis loops measurements and chemical analysis [X-ray fluorescence (XRF)]. We inferred the possibility of goethite occurrence in broad particle size distribution (5-50 nm), and related to ferrihydrite, and small grain-size hematite (about 8 nm). The magnetometry results pointed to the paramagnetic/superparamagnetic behavior of the magnetic phases present in the samples and also suggested the occurrence of small grain-size magnetite. We also verified the presence of clay minerals related to Fe, as well as the occurrence of Fe3+ and/or Fe2+ in short-range structural order. Through a straight correlation among Mössbauer spectra data gained at T = 77 K and Al-metal, metal-Fe molar ratios, provided through XRF data, we found remarkable indications of interference on meta-stable phases evolution to its final products. Such results can be pointing for evidences about the possible isomorphic replacing and/or adsorption of Al and other metals in goethite and hematite. © 2006 Springer-Verlag.
Editor: 
Rights: fechado
Identifier DOI: 10.1007/s00254-006-0525-5
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-34247324423&partnerID=40&md5=d91ef0b1c4ea95afd417882f6f5cbced
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
2-s2.0-34247324423.pdf405.11 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.