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	Provedor de dados PAB (1) Rev. Bras. Ciênc. Solo (1) Autor Guiotoku,Marcela (2) Franciscon,Luziane (1) Hansel,Fabricio Augusto (1) Maeda,Shizuo (1) Maia,Claudia Maria Branco de Freitas (1) Neiverth,Cristhiane Anete (1) Novotny,Etelvino Henrique (1) Pereira,Claudia Mara (1) Mais... Palavra-chave Anthropogenic dark earth of Amazonia (1) Automatic titrator (1) Biochar (1) Charcoal (1) Gas chromatography (1) Ion selective electrode (1) Mass spectrometry (1) Nuclear magnetic resonance (1) Potentiometry (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2012 (1) 2011 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Complexometric titration with potenciometric indicator to determination of calcium and magnesium in soil extracts¹ Rev. Bras. Ciênc. Solo Pereira,Claudia Mara; Neiverth,Cristhiane Anete; Maeda,Shizuo; Guiotoku,Marcela; Franciscon,Luziane. This study proposes a method of direct and simultaneous determination of the amount of Ca2+ and Mg2+ present in soil extracts using a Calcium Ion-Selective Electrode and by Complexometric Titration (ISE-CT). The results were compared to those obtained by conventional analytical techniques of Complexometric Titration (CT) and Flame Atomic Absorption Spectrometry (FAAS). There were no significant differences in the determination of Ca2+ and Mg2+ in comparison with CT and FAAS, at a 95 % confidence level. Additionally, results of this method were more precise and accurate than of the Interlaboratorial Control (IC). Tipo: Info:eu-repo/semantics/article Palavras-chave: Ion selective electrode; Automatic titrator; Potentiometry. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400027 Molecular and morphological characterization of hydrochar produced by microwave-assisted hydrothermal carbonization of cellulose PAB Guiotoku,Marcela; Hansel,Fabricio Augusto; Novotny,Etelvino Henrique; Maia,Claudia Maria Branco de Freitas. The objective of this work was to characterize the morphology and molecular composition of the hydrochar produced by microwave-assisted hydrothermal carbonization of cellulose. The produced hydrochar consists mainly of aggregate microspheres with about 2.0 µm in diameter, with aliphatic and aromatic structures and the presence of carbonyl functional groups. The aromatic groups are formed mainly by benzofuran-like structures, being chemically different from common cellulose char. Microwave-assisted hydrothermal carbonization yields a functionalized carbon-rich material similar to that produced by the conventional hydrothermal process. Tipo: Info:eu-repo/semantics/article Palavras-chave: Anthropogenic dark earth of Amazonia; Biochar; Charcoal; Gas chromatography; Mass spectrometry; Nuclear magnetic resonance. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000500008 Registros recuperados: 2 Primeira ... 1 ... Última

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