Complexation Capacity
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. 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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2. Solubility of Heavy Metals/Metalloid on Multi-Metal Contaminated Soil Samples from a Gold Ore Processing Area: Effects of Humic Substances
ABSTRACT Bioavailability of heavy metals at contaminated sites is largely controlled by the physicochemical properties of the environmental media such as dissolved organic matter, hydroxides and clay colloids, pH, soil cation exchange capacity and oxidation-reduction potential. The aim of this study was to investigate soil pH and heavy metal solubility effec
Rev. Bras. Ciênc. Solo. Publicado em: 30/06/2016
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3. Influência das substâncias húmicas de sedimentos na biodisponibilidade de metais para o sistema aquático
In rivers, sediments act as sinks for retaining contaminants. This study evaluated the influence of sediment humic substances (HS) on the bioavailability of metals. The levels of metals in sediments and HS indicated that most are complexed with HS. Characterization of HS showed a high degree of humification. The complexation capacity of HS for metals establi
Quím. Nova. Publicado em: 2014-07
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4. Copper(II) and nickel (II) complexation capacity of dissolved organic matter from rivers of agricultural and urban areas in the state of São Paulo
Este estudo teve como principal objetivo determinar a capacidade de complexação da Matéria Orgânica (MO) de regiões tipicamente agrícolas e urbanas, com os íons de cobre e níquel. As amostras foram coletadas durante as estações de seca e chuva e submetidas ao estudo da capacidade de complexação e da constante de estabilidade condicional da MO com
J. Braz. Chem. Soc.. Publicado em: 2013-11
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5. 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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6. Análise espacial e temporal de dados fisicos e químicos de águas superficiais, das sub-bacias do rio Turvo Sujo e do ribeirão São Bartolomeu, por quimiometria / Spatial and temporal analysis of chemical and physical data of surfaces waters, of the sub basins of the Turvo Sujo river and São Bartolomeu stream, by chemometrics
Este trabalho teve como objetivo analisar a variação espacial e temporal de dados físicos e químicos de águas superficiais coletadas em 23 pontos, sendo 15 pontos ao longo da sub-bacia do Rio Turvo Sujo e 8 pontos ao longo da sub-bacia do Ribeirão São Bartolomeu, da zona da mata mineira durante nove meses de amostragem. Os dados físico-químicos fora
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/02/2012
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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. Análise de especiação de cobre e zinco empregando voltametria de redissolução anódica com pulso diferencial
This work describes methodologies for speciation analysis of the metals copper and zinc as total, total dissolved, labile, as well as complexation capacity (conditional stability constants and available ligand concentration), using the same technique, differential pulse anodic stripping voltammetry (DPASV). Several supporting electrolytes were tested, and th
Química Nova. Publicado em: 2012
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9. Quitosana modificada quimicamente atraves de cloretos organicos e o uso como fonte em remoção cationica / Chitosan chemically modified with organic chlorides and the use as source in cationic removal
The biopolymer chitosan was submitted to a series of reactions, with the purpose to explore the free amino group reactivity polymeric chain through reactions involving organic chlorides and primary amines compounds. Isophthaloyl dichloride and cyanuric chloride were used in the modifications, following by reactions with ethylenediamine or diethylenetriamine.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2010
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10. Estudo sobre o hidróxido de potássio no processo de produção industrial de poliol poliéter
Metallic ions may interact with polyether polyols giving macromolecular complexes. From this approach, it was investigated the interaction of cationic potassium with polyether polyols by means of several techniques in order to proof complexation as well as its ocurrence. The industrial synthesis of polyether polyols does not result in a pure product but give
Publicado em: 2010
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11. SÍNTESE E ARRANJOS SUPRAMOLECULARES DE COMPLEXOS BIS(TRIAZENIDO) MACROCÍCLICOS E TRIAZENIDO 1-ÓXIDO COM OS CÁTIONS Cu2+, Ni2+, Cu+, K+. / SYNTHESIS AND SUPRAMOLECULAR ARRANGEMENTS OF BIS(TRIAZENIDE) MACROCYCLIC AND TRIAZENIDE 1-OXIDE COMPLEXES WITH Cu2+, Ni2+, Cu+, K+ CATIONS.
This work elaborates on the determination of crystal and molecular structures of four pro-ligands, emphasizing bis(triazenes), triazene 1-oxide and a new class of bis(triazenes) macrocyclic, and eight complexes involving Cu+, Cu2 +, Ni2 + and K+. Pro-ligands triazenes 1-oxide are relatively small and simple molecules. When they are deprotonated they presen a
Publicado em: 2010
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12. Eficiência agronômica de fertilizantes fosfatados em solos com diferentes capacidades de adsorção de fósforo e teores de matéria orgânica / Agronomic efficiency of phosphate fertilizers in soils with different capacity of phosphate adsorption and organic matter levels
Tropical soils highly intemperized show increased capability on phosphorus (P) adsorption. Several factors may influence P adsorption in such soils, but special attention must be paid on the organic matter level. Mechanisms involved in this process are related to the release of organic acids derived from the decomposition of the organic matter, which may eit
Publicado em: 2010