Environmental Aqueous Samples
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Determinação de anti-inflamatórios em efluente urbano na região de Porto Alegre-RS por SPE, derivatização e GC-MS
In this work the development of an analytic methodology was studied to determine and quantify seven non-steroidal anti-inflammatory drugs, widely used in human treatment, and caffeine considered an anthropogenic marker. The compounds studied were acetaminophen (AC), salicylic acid (AS), caffeine (CA), ketoprofen (CE), diclofenac (DC), dipyrone (DP), ibuprofe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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14. Desenvolvimento e caracterização de nanocompósitos produzidos a partir de miniemulsão acrílica aquosa contendo nanopartículas de prata
Lately, the polymer latices have gained increasing importance having the great advantage of using water as a solvent, that reduces the emission of volatile organic compounds a big environmental concern. In the industry, the polymeric latices are obtained usually through an emulsion polymerization. They can also be obtained by the polymerization in miniemulsi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2011
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15. Avaliação da influência da matéria orgânica, na determinação quantitativa de metais em amostras de sedimento, por espectrometria de absorção atômica e análise de metais traços por fluorescência de raios-X
The proposal of this work is to evaluate the influence of the organic matter on the results of the analyses of the metals (Zn, Pb, Al, Cu, Cr, Fe, Cd e Ni) for Atomic Absorption Spectrometry (AAS), so much in the extraction stage as in the reading using for that the chemometrics. They were used for this study sample of bottom sediment collected in river Jund
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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16. Technological development of aqueous extracts from Calycophyllum spruceanum (Benth.) Hook. f. ex K. Schum., Rubiaceae, (mulateiro) using factorial design
The aim of the present work is to characterize the vegetal raw material of the Calycophyllum spruceanum (Benth.) Hook. f. ex K. Schum., Rubiaceae, known as "mulateiro", and to evaluate the influence of extractive parameters for attainment of standardized aqueous extractive solutions. The physical-chemical characterization of the samples was performed using p
Revista Brasileira de Farmacognosia. Publicado em: 04/03/2011
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17. Batch-wise adsorption, saxs and microscopic studies of zeolite pelletized with biopolymeric alginate
Removal of nitrates, sulfate and Zn(II) ions from aqueous solutions through adsorption onto biopolymeric alginate/clinoptilolite-rich tuff pellets was studied by using an equilibrium batch technique. The idea of this approach of biosorbent fabrication is to promote the native zeolite adsorption performance and thus to prepare more efficient amphoteric tailor
Brazilian Journal of Chemical Engineering. Publicado em: 2011-03
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18. NANOCOMPÓSITOS BASEADOS EM QUANTUM DOTS DE CdS E CdS:Cu SUPORTADOS EM MERCAPTOPROPILSÍLICA:síntese, caracterização e aplicação em fotocatálise. / NANOCOMPOSITES BASED ON CdS AND CdS:Cu QUANTUM DOTS SUPPORTED ON MERCAPTOPROPYL-SILICA: synthesis, characterization and application in photocatalysis.
Textile dyes and other commercial dyestuffs have become a focus of environmental remediation efforts in the last few years. Considerable attention has been expended recently on the photocatalytic oxidative degradation of colored contaminants in waste water over semiconductor surfaces. In this work, we evaluated the photocatalytic activities of nanocomposites
Publicado em: 2011
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19. "Resistência à Corrosão de Aços Inoxidáveis em Solução Sintética de Condensado de Álcool Combustível / "Resistência à Corrosão de Aços Inoxidáveis em Solução Sintética de Condensado de Álcool Combustível
Nowadays a great effort had been directed to research work in order to attend the environmental protection agencies demands for minimizing the levels of gases emission pollutants. The consumers requirements for more economic and durable vehicles had motivated also the researchers to look for more corrosion resistance materials in order to substitute the trad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2010
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20. Um método verde e sensível para determinação de fenóis em amostras de água utilizando sistemas aquosos bifásicos / A greener and sensitive method for phenols determination in water samples using aqueous twophase systems
This work initially presents a brief review of aqueous two- phase systems (ATPS), including the history, principles and properties of the technique. Furthermore, a divulgation on green methods for determination of phenols in water is shown, since these substances have high toxicity. The disposal of phenolic compounds is regulated in several countries, includ
Publicado em: 2009
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21. Comparação entre metodologias de extração de HPAs em água utilizando um planejamento fatorial com quantificação no CG/EM
PAHs (Polycyclic Aromatic Hydrocarbons) are a group of organic substances which receive considerable attention because of the carcinogenic and mutagenic properties of some of them. It is therefore important to determine the PAHs in different environmental matrices. Several studies have shown the use of gas chromatography coupled to mass spectrometry as a tec
Publicado em: 2009
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22. Aqueous Congo Red degradation induced by plasma with glow discharge electrolysis / Degradação do corante Vermelho Congo em solução aquosa através de plasma obtido por eletrólise de alta tensão
Due to the concern with environmental impact and the need for the use of dyes for the textile industries, during the last years several studies has been undertaken to develop new technologies for energetic treatments that allow the degradation of compounds present in industrial waste. In this present work, the construction of a system for degradation of orga
Publicado em: 2009
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23. CEFALOSPORINAS E SURFACTANTE NÃO-IÔNICO EM EFLUENTE HOSPITALAR: DETERMINAÇÃO, DEGRADAÇÃO POR MEIO DE FOTÓLISE E ELETROCOAGULAÇÃO E IDENTIFICAÇÃO DE SUBPRODUTOS E METABÓLITOS / CEFALOSPORINS AND NON IONIC SURFACTANTS IN HOSPITAL WASTEWATER: DETERMINATION, DEGRADATION BY MEANS OF PHOTOLYSIS AND ELECTROCOAGULATION AND IDENTIFICATION OF BYPRODUCTS AND METABOLITES
The currently incorrect and excessive consumption of pharmaceuticals and surfactants, mainly domestic usage, has become a concern to the scientific community around the world, due to the environmental consequences with regard to the bacterial resistance (characteristic of antibiotics), and alteration of hormonal systems (provoked by the degradation products
Publicado em: 2009
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24. AvaliaÃÃo da qualidade do sedimento do estuÃrio do rio Cearà / Quality evaluation of the estuary sediment of the river Ceara
The evaluation of sediment quality has been seen as a consistent and necessary extension of assessment programmes for water resources. Sediments are the most concerning of the compartments due characteristics that favour the deposition and accumulation of contaminants. Previous studies showed that the estuary of Cearà River is suffering contamination by ind
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2008