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	Provedor de dados Scientia Agricola (1) Rev. Bras. Ciênc. Solo (1) Autor Alcântara,Marco Aurélio Kondracki de (1) Ferrari,Viviane Carillo (1) Francisco,Eros Artur Bohac (1) Izário Filho,Hélcio José (1) Jesus,Sérgio Luís de (1) Prochnow,Luís Ignácio (1) Salazar,Rodrigo Fernando dos Santos (1) Toledo,Maria Cristina Motta de (1) Mais... Palavra-chave Calcination (2) Atomic absorption spectrometry (1) Environmental pollution (1) Phosphate fertilizer (1) Phosphate impurities (1) Trace elements (1) Wet digestion (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Info:eu-repo/semantics/report (1) Ano 2011 (1) 2007 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Evaluation of sample preparation methods and optimization of nickel determination in vegetable tissues Rev. Bras. Ciênc. Solo Salazar,Rodrigo Fernando dos Santos; Alcântara,Marco Aurélio Kondracki de; Izário Filho,Hélcio José. Nickel, although essential to plants, may be toxic to plants and animals. It is mainly assimilated by food ingestion. However, information about the average levels of elements (including Ni) in edible vegetables from different regions is still scarce in Brazil. The objectives of this study were to: (a) evaluate and optimize a method for preparation of vegetable tissue samples for Ni determination; (b) optimize the analytical procedures for determination by Flame Atomic Absorption Spectrometry (FAAS) and by Electrothermal Atomic Absorption (ETAAS) in vegetable samples and (c) determine the Ni concentration in vegetables consumed in the cities of Lorena and Taubaté in the Vale do Paraíba, State of São Paulo, Brazil. By means of the analytical technique for... Tipo: Info:eu-repo/semantics/report Palavras-chave: Trace elements; Atomic absorption spectrometry; Calcination; Wet digestion; Environmental pollution. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000100022 Thermal treatment of aluminous phosphates of the crandallite group and its effect on phosphorus solubility Scientia Agricola Francisco,Eros Artur Bohac; Prochnow,Luís Ignácio; Toledo,Maria Cristina Motta de; Ferrari,Viviane Carillo; Jesus,Sérgio Luís de. Optimization in the use of phosphate rocks is important and the residues of fertilizer production in the form of crandallite may be suitable for agronomic use after calcination. With the objective of evaluating the effect of thermal treatment of the aluminous phosphates of the crandallite group as related to solubility, crystalline structure and morphology, samples from the mine residues of three Brazilian phosphate deposits (Tapira-MG, Catalão-GO, and Juquiá-SP) were collected, air-dried, and screened to 100 mesh. Sub samples were thermally treated at 300, 500, 700, and 900°C for 2 hours. Treated and untreated materials were analyzed by X-ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectrometry, and for the total and soluble P... Tipo: Info:eu-repo/semantics/article Palavras-chave: Calcination; Phosphate fertilizer; Phosphate impurities. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300009 Registros recuperados: 2 Primeira ... 1 ... Última

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