Pedogenic iron oxides in soils of the Acre State, Brazil
ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solimões Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al3+-substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated soils in the intermediate stage of weathering, with dominance of goethite, hematite and maghemite. This condition of weathering was confirmed by the higher frequency of goethites and hematite with intermediate Al3+-substitution. Goethites have isodimensional forms and hematite have flat plaques forms.
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Universidade Federal de Santa Maria
2018
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oai:scielo:S0103-847820180008002512018-07-19Pedogenic iron oxides in soils of the Acre State, BrazilInda,Alberto VasconcellosFink,Jessé RodrigoSantos,Tatiele Fruett dos mineralogy x ray diffraction hematite goethite. ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solimões Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al3+-substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated soils in the intermediate stage of weathering, with dominance of goethite, hematite and maghemite. This condition of weathering was confirmed by the higher frequency of goethites and hematite with intermediate Al3+-substitution. Goethites have isodimensional forms and hematite have flat plaques forms.info:eu-repo/semantics/openAccessUniversidade Federal de Santa MariaCiência Rural v.48 n.8 20182018-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000800251en10.1590/0103-8478cr20180209 |
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Inda,Alberto Vasconcellos Fink,Jessé Rodrigo Santos,Tatiele Fruett dos |
| spellingShingle |
Inda,Alberto Vasconcellos Fink,Jessé Rodrigo Santos,Tatiele Fruett dos Pedogenic iron oxides in soils of the Acre State, Brazil |
| author_facet |
Inda,Alberto Vasconcellos Fink,Jessé Rodrigo Santos,Tatiele Fruett dos |
| author_sort |
Inda,Alberto Vasconcellos |
| title |
Pedogenic iron oxides in soils of the Acre State, Brazil |
| title_short |
Pedogenic iron oxides in soils of the Acre State, Brazil |
| title_full |
Pedogenic iron oxides in soils of the Acre State, Brazil |
| title_fullStr |
Pedogenic iron oxides in soils of the Acre State, Brazil |
| title_full_unstemmed |
Pedogenic iron oxides in soils of the Acre State, Brazil |
| title_sort |
pedogenic iron oxides in soils of the acre state, brazil |
| description |
ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solimões Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al3+-substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated soils in the intermediate stage of weathering, with dominance of goethite, hematite and maghemite. This condition of weathering was confirmed by the higher frequency of goethites and hematite with intermediate Al3+-substitution. Goethites have isodimensional forms and hematite have flat plaques forms. |
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Universidade Federal de Santa Maria |
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2018 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000800251 |
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