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| Camêlo,Danilo de Lima; Ker,João Carlos; Fontes,Maurício Paulo Ferreira; Corrêa,Marcelo Metri; Costa,Antonio Carlos Saraiva da; Melo,Vander Freitas. |
| ABSTRACT Despite the considerable amount of information on the mineralogical characteristics of pedogenic Fe oxides in Brazilian soils, there are few studies on Fe-rich soils developed from mafic rocks with taxonomic identities at lower categorical levels. This study evaluated the mineralogical characteristics of pedogenic Fe oxides in B horizons (Bw) of Fe-rich Oxisols developed from several mafic rocks in the state of Minas Gerais, Brazil. The Bw horizons were sampled at a 0.8-1.0 m depth in 13 Ferric and Perferric Rhodic Oxisols along with a Mesoferric Typic Oxisol originating from basalt, gabbro, tuffite, amphibolite and itabirite in Minas Gerais. The selected soils have taxonomic identities up to the fourth categorical level of the Brazilian System of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hematite; Maghemite; Crystallographic characteristics; Al-substitution; Selective dissolution. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100413 |
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| Testoni,Samara Alves; Melo,Vander Freitas; Dawson,Lorna Anne; Salvador,Fábio Augusto da Silva; Kunii,Paulo Akira. |
| ABSTRACT Soil traces are useful as forensic evidence due to their potential to transfer and adhere to different types of surfaces on a range of objects or persons. Several works have been developed in forensic soils, under different analytical approaches. However, in Brazil, only the researches from the Group of the Federal University of Paraná have developed works with soils under a forensic approach. Focus has been given on the sequential chemical analyses and mineralogical techniques once they presented a large potential to discriminate soil samples, even that originated from the same bedrock. In this way, this work aimed to test a Standard Operating Procedure (SOP) for forensic soil sampling and an analytical protocol in Brazil between the academy and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forensic science; Soil evidence; Sequential chemical analysis; Gibbsite; Iron oxides. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100410 |
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| Melo,Vander Freitas; Orrutéa,Alessandro Góis; Motta,Antônio Carlos Vargas; Testoni,Samara Alves. |
| ABSTRACT Many Amazonian farmers use the slash-and-burn method rather than fertilization for crop production. The aim of the present study was to evaluate changes in the morphological, physical, and chemical properties of naturally fertile Inceptisols after conversion from native forest to different uses in southern Amazonia, Brazil. Land covered by dense native forest (NF) was split into four areas of 1.0 ha each. Three areas were slashed and burned and then cultivated for 11 years with coffee (CO), secondary forest (SF), and pasture (PA). Four soil profiles were sampled in each treatment (four uses × four replicates). The mean value distribution of each physical and chemical analysis was determined for different depths, and standard error bars were placed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Secondary forest; Coffee; Pasture; Slash and burn; Ash effect. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100523 |
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