Gaseous Chromatography
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Anti-Biofilm and Hemolytic Effects of Cymbopogon citratus (Dc) Stapf Essential Oil
Abstract Objective: To perform chemical analysis and to evaluate the anti-biofilm and hemolytic effect of the essential oil of Cymbopogon citratus. Material and Methods: Gaseous chromatography coupled to mass spectrometer was performed for chemical characterization of the essential oil. To verify the antimicrobial action, the Minimum Inhibitory Concentrati
Pesqui. Bras. Odontopediatria Clín. Integr.. Publicado em: 13/01/2020
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2. Production and Characterization of the Bio-Oil Obtained by the Fast Pyrolysis of Spent Coffee Grounds of the Soluble Coffee Industry
Agro-industrial wastes are abundant and low-cost sources of energy and chemicals. Biomass account for 14% of the world’s energy production. Industrial residues of production of soluble coffee (spent coffee grounds - SCG) have great potential due to its large-scale production and can be transformed by pyrolysis, in liquid, solid and gaseous products with ap
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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3. Investigation of Electrocatalysts for Selective Reduction of CO2 to CO: Monitoring the Reaction Products by on line Mass Spectrometry and Gas Chromatography
The carbon dioxide electrocatalytic reduction is central for the development of regenerative cycles of electrochemical energy conversion and storage. Herein, the gaseous products of the CO2 electroreduction were monitored by using an electrochemical cell on line coupled to a differential electrochemical mass spectrometer (DEMS), aiming at searching for elect
J. Braz. Chem. Soc.. Publicado em: 2017-09
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4. CHARACTERIZATION OF ENALAPRIL AND RANITIDINE CHLORINATION BY-PRODUCTS BY LIQUID CHROMATOGRAPHY/HIGH-RESOLUTION MASS SPECTROMETRY AND THEIR TOXICITY EVALUATION
Due to its low cost, its capability for disinfection and oxidation, chlorination using gaseous chlorine or hypochlorite salts, has also been commonly applied in water treatment plants for oxidation and disinfection purposes. Little is known about the identity and toxicity of by-products resulting from the chlorination of pharmaceutical micropollutants, such
Quím. Nova. Publicado em: 2017-08
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5. DESENVOLVIMENTO DE UM PROCESSO CONTÍNUO PARA PRODUÇÃO DE BIODIESEL A BAIXAS TEMPERATURAS. / DEVELOPMENT OF A CONTINUOUS PROCESS FOR PRODUCING BIODIESEL AT LOW TEMPERATURES.
Biodiesel has emerged worldwide as a promising alternative to oil-derived mineral fuels. It is biodegradable, renewable, obey to the carbon cycle and can be defined as fatty acid monoalquyl esters derived from renewable sources, such as vegetable oils and animal fats. It can be produced from a transesterification reaction, in which there is the transformatio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2011
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6. Determinação de constituintes químicos em madeira de eucalipto por Pi-CG/EM e calibração multivariada: comparação entre redes neurais artificiais e máquinas de vetor suporte
Multivariate models were developed using Artificial Neural Network (ANN) and Least Square - Support Vector Machines (LS-SVM) for estimating lignin siringyl/guaiacyl ratio and the contents of cellulose, hemicelluloses and lignin in eucalyptus wood by pyrolysis associated to gaseous chromatography and mass spectrometry (Py-GC/MS). The results obtained by two c
Química Nova. Publicado em: 2011
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7. Análise multirresíduo de agrotóxicos em abacaxi por CG/DCE / Analysis multiresidue of pesticides in pineapple by GC/ECD
The objectives of this work were to optimize the technique of extraction by matrix solid-phase dispersion (MSPD) and the solid-liquid with partition in low temperature extraction technique (SLE-LTP), and to validate this latter, to the residues analysis of the pesticides atrazine, thiamethoxam, triadimenol and deltamethrin in pineapple samples, by gas chroma
Publicado em: 2010
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8. FLUXO DE GASES DE EFEITO ESTUFA EM SISTEMAS DE PREPARO DO SOLO E ROTAÇÃO DE CULTURAS NO PLANALTO DO RIO GRANDE DO SUL / GREENHOUSE GASES FLUX IN SYSTEMS OF SOIL TILLAGE AND CROP ROTATION IN THE PLANALTO REGION OF RIO GRANDE DO SUL
The main greenhouse gases (GHG) are the nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2), whose atmosphere concentrations increased in an unprecedented rate since the Industrial Revolution. This work aim evaluates the GEE emissions of spring/summer season in different soil management systems located in the Planalto region of Rio Grande do Sul Stat
Publicado em: 2009
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9. Co-pirólise de polipropileno pós-consumo com gasóleo / Co-pyrolysis of polypropylene residues with gas-oil
In this study, the process of co-pyrolysis of polypropylene (PP) residues with gas-oil was evaluated, varying the temperature and the amount of polypropylene fed to the reactor. The co-pyrolysis is a promising route to minimize the environmental impact caused by the inadequate disposal of plastics, preventing its accumulation in landfields and giving a bette
Publicado em: 2008
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10. EMISSÃO DE GASES DE EFEITO ESTUFA EM SISTEMAS DE MANEJO EM SOLO DO PLANALTO MÉDIO DO RIO GRANDE DO SUL / SHORT-TERM GREENHOUSE GASES EMISSIONS IN SOIL MANAGEMENT SYSTEMS IN OXISOL OF SOUTHERN BRAZIL
Agriculture is directly linked to atmospheric concentration of greenhouse gases (GHG) through basic processes that occur in the soil-plant system. Agricultural soils can act as a source or sink of GHG depending on the management practices adopted. The objective of this research was to evaluate the GHG flux in different soil management systems. This project w
Publicado em: 2008
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11. Análise multirresíduo de inseticidas em batata (Solanum tuberosum L.) / Analysis multiresidue of insecticides in potato (Solanum tuberosum L.)
The objective of this project was to develop and valid the solid-liquid extraction methodology and purification in low temperature (ESL-PBT) to the residues analysis of the insecticides, chlorpyrifos, λ-cyhalothrin, cypermethrin and deltamethrin in potatoes. On the optimization stage, the agrotoxics extraction of interests of samples of fortified potato
Publicado em: 2007
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12. Co-pirolysis of Bacia de Campos polyethylene waste / Co-Pirólise de resíduos de polietileno com gás-óleo da Bacia de Campos
In this study the process of co-pyrolysis of plastic polyethylene residue was carried through with gas-oil under temperature variation. Initially the two samples had been submitted the thermal co-pyrolysis in inert atmosphere 550C, furtherly evaluated the efficiency of the process 500C and 450C. The pyrolysed liquids produced by this thermal treatment had be
Publicado em: 2007