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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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| Cunha,Gabriel Octávio de Mello; Almeida,Jaime Antonio de; Testoni,Samara Alves; Barboza,Bethina Bastos. |
| RESUMO O Al trocável é tradicionalmente quantificado no extrato da solução de KCl 1 mol L-1; entretanto, nem sempre o Al provém unicamente de formas trocáveis desse elemento. Este trabalho objetivou investigar as formas de Al presentes em solos ácidos de várias regiões brasileiras, com distintas mineralogias, buscando elucidar se todo o Al-KCl corresponde às formas trocáveis do elemento. Foram testados os seguintes extratores para Al: Método tradicional (KCl 1 mol L-1), e variações desse método (curvas de titulação potenciométrica, método das extrações sucessivas e tamponado a pH 5), KCl 0,1 mol L-1, CaCl2 0,01 mol L-1, oxalato de amônio 0,2 mol L-1, pirofosfato de sódio 0,1 mol L-1 e CuCl2 0,5 mol L-1. A quantificação do elemento foi feita por titulação... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Métodos de extração de alumínio; Extratores. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501362 |
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| Testoni,Samara Alves; Almeida,Jaime Antonio de; Silva,Luana da; Andrade,Gabriel Ramatis Pugliese. |
| ABSTRACT Shrinkage capacity (caráter retrátil in Portuguese) is a new diagnostic characteristic recently introduced in the Brazilian System of Soil Classification (SiBCS) to indicate shrink and swell properties observed in subtropical soils from highland plateaus in southern Brazil, specifically in Oxisols with brown colors. In soils located in road cuts exposed to drying for some weeks, strong shrinkage of soil volume is observed in these soils, resulting in the formation of pronounced vertical cracks and large and very large prismatic structures, which crumble in blocks when handled. We hypothesize that such properties are related to their clay mineralogy, although there are no conclusive studies about this, the motive for the present study. Samples of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kaolinite-smectite; Interstratified clay mineral; X-ray diffraction; Quasicrystals. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100420 |
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