Al Complexation
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Influence of the pH regulator on the dolomite hydrophobization process
Abstract A study was carried out to investigate the combined effect of released ions in the pulp by pH regulator and mineral surface on dolomite flotation. The tests were carried out using a dolomite sample in a bench flotation cell with automatic froth remover. Zeta potential measurements, solution conductivity and FTIR analysis were done to support the int
REM, Int. Eng. J.. Publicado em: 2020-09
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2. Modeling boron adsorption on five soils before and after removal of organic matter
ABSTRACT Boron- B concentrations that cause deficiency and those that cause toxicity appear to be very similar, compared to other nutrients, which can complicate successful management of this element in soils. In this study, B adsorption onto two Oxisols from Brazil (Rhodic Eutroperox and Anionic Acroperox), two Alfisols (Natric Palexeralf and Aridic Paleust
Sci. agric. (Piracicaba, Braz.). Publicado em: 04/11/2019
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3. DETERMINAÇÃO DE Al3+, Fe3+ E Cu2+ PRESENTES EM SOMBRAS DE MAQUIAGEM POR ESPECTROFOTOMETRIA UV-Vis: UMA PROPOSTA DE EXPERIMENTO CONTEXTUAL EM NÍVEL SUPERIOR DE ENSINO
Metallic oxides are used in cosmetic shadows formulations in order to highlight the area around the eyes, with different colors. Due to the close proximity to the eye mucosa, these products are a potential source of metal intoxication in human body. Based in this fact, several analytical methods to quantify metals in cosmetic shadows have been proposed in th
Quím. Nova. Publicado em: 02/05/2019
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4. ELUCIDATION OF THE ELECTRONIC SPECTRUM CHANGES OF KA-Al3+ COMPLEX BY POTENTIOMETRIC TITRATION, FTIR, 13C RMN AND QUANTUM MECHANICS
Kojic acid (KA) is an organic acid widely used in pharmaceutical industry, mainly as a skin lightening agent. Based on the ability of KA to form complexes with ions, we found the most possible kind of complex formed with cation aluminum. KA-Al3+ complex structures were studied using potentiometric and spectrophotometric (UV) titrations, FTIR and 13C NMR. The
Quím. Nova. Publicado em: 2017-08
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5. Estudio teorico de las interacciones de dos modelos de ácidos húmicos con los cationes Al3+, Ca2+, Mg2+, Zn2+, K+ y NH4+ a un nivel de calculo DFT y un modelo de solvatación PCM
In this paper, two models of humic acids, the Temple-Northeastern-Birmingham (TNB) and Kolla models, were studied. Also, the complexation reaction of the structures formed by the interaction of the TNB and Kolla models with Al3+, Ca2+, Mg2+, Zn2+, K+ and NH4+ cations, common in agricultural soils, was studied. These calculations were made for the complexes,
Quím. Nova. Publicado em: 2017-04
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6. CHARACTERIZATION AND EVALUATION OF INTERACTION BETWEEN SPECIES AND METAL HUMIC SUBSTANCES OF PEAT: an alternative for remediation of soil and surface water in the arid region of Sergipe. / CARACTERIZAÇÃO E AVALIAÇÃO DA INTERAÇÃO ENTRE ESPÉCIES METÁLICAS E SUBSTÂNCIAS HÚMICAS DE TURFA: uma alternativa para remediação de solos e águas superficiais na região do agreste sergipano.
This study aimed to understand the interactions between humic substances extracted from peat and metallic species, of the National Park of Itabaiana - SE, seeking a further application in the remediation of soil, surface water contaminated by agricultural activities. We collected samples of soil, fertilizer and peat and characterized by the organic matter co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/12/2012
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7. Solar radiation effect on the complexation capacity of aquatic humic substances with metals
Este estudo teve como principal objetivo avaliar o efeito da radiação solar sobre a capacidade de complexação das substâncias húmicas aquáticas (AHS) com as espécies metálicas Al3+, Cr3+, CrO4(2-) e Ni2+. Microcosmos foram montados com AHS extraídas do Rio Preto com concentração de 5,0 mg L-1 de carbono orgânico dissolvido e diferentes concentra
J. Braz. Chem. Soc.. Publicado em: 26/10/2012
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8. Caracterização morfológica e microestrutural da perovskita BaCexPr1-xO3 sintetizada a partir do método de complexação combinando EDTA/Citrato
No presente trabalho, perovskitas binárias do tipo (BaCexO3) foram dopadas com praseodímio (Pr) para obtenção de materiais ternários do tipo BaCexPr1-xO3. Esse material foi sintetizado pelo método de complexação combinando EDTA/Citrato, com a razão estequiométrica do elemento praseodímio variando de x=0,1 a x=0,9, com objetivo de determinar a infl
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011
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9. Solos subtropicais de altitude: atributos químicos, teor de matéria orgânica e resistência à oxidação química
Neste trabalho foram estudadas amostras de horizontes A de oito solos representativos da região Campos de Cima da Serra, Rio Grande do Sul, sendo determinados: textura, pH em água, CTC a pH 7, teores de Al trocável e de óxidos de Fe (Fed e Feo). As amostras foram tratadas com peróxido de hidrogênio e, antes e após tratamento, foram determinados teores
Publicado em: 2010
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10. STUDY OF BINARY COMPLEXES OF ALUMINUM(III) WITH SULFUR AMINO ACIDS AND PHOSPHATE LIGANDS / ESTUDO DE COMPLEXOS BINÁRIOS DE ALUMÍNIO(III) COM AMINOÁCIDOS SULFURADOS E LIGANTES FOSFATADOS
The study of binary complexes of Al(III) with sulfur amino acids (methionine, cysteine, homocysteine and penicillamine) and phosphate ligands (adenosine 5 - triphosphate and phosphocreatine) was done in aqueous solution applying potentiometric titrations, (13)C and (27)Al NMR, Raman spectroscopy, molecular modeling and DFT: B3LYP/6-311G theoretical calculati
Publicado em: 2010
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11. ESTUDO FISICO-QUÍMICO DO COMPLEXO DE INCLUSÃO DO FÁRMACO TRIMETOPRIM COM A β CICLODEXTRINA ALEATORIAMENTE METILADA / STUDY OF PHYSICAL-CHEMICAL INCLUSION COMPLEX DRUG TRIMETHOPRIM WITH RANDOM METHYL Β CYCLODEXTRIN
Cyclodextrins are well-known as good solubilizers for many drug molecules, since they are capable of increasing the solubility of the drugs by the formation of inclusion complexes, which in turn can be used in pharmaceutical formulations. In this work we aimed to prepare and characterize inclusion complexes of the randomly methylated β-cyclodextrin (RAM
Publicado em: 2010
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12. Adsorção e dessorção aniônicas individuais por gibbsita pedogenética
Anion adsorption/desorption dynamics was studied as individual processes on surface of particles of a gibbsitic clay. The data suggest a remarkable gibbsite role as nitrate leaching retardant in soil. The opposite behavior of gibbsite towards adsorption/desorption of silicate and phosphate suggests the need of an adequate compromise solution regarding interv
Química Nova. Publicado em: 2009