Multi Residue
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Pesticide Determination in Water Samples from a Rural Area by Multi-Target Method Applying Liquid Chromatography-Tandem Mass Spectrometry
The rises of toxic effects caused by pesticides are of concern. However, Brazilian legislation still needs scientific subsides to improve the water quality requirements. This can be attributed in part to the few existing studies showing the occurrence and levels of multi-residue pesticides. Therefore, the objective of this study was to investigate the presen
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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2. Multi-Residue Method for Determination of Thirty-Five Pesticides, Pharmaceuticals and Personal Care Products in Water Using Ionic Liquid-Dispersive Liquid-Liquid Microextraction Combined with Liquid Chromatography-Tandem Mass Spectrometry
Ionic liquid-dispersive liquid-liquid microextraction (IL-DLLME) was used for the determination of different chemical classes of analytes for the first time. Limits of quantification (LOQs) ranged from 0.5 to 2.5 µg L-1, and the linearity ranged from the LOQ of each compound to 50 µg L-1. Recoveries ranged from 70 to 120% for the compounds, with relative s
J. Braz. Chem. Soc.. Publicado em: 2018-06
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3. Multi-objective Optimization of Supercritical Water Gasification of Leftover Brazilian Ginseng Roots After Phytochemical Recovery Steps
Abstract The present study aims at studying the supercritical water gasification (SCWG) of leftover Brazilian ginseng roots after phytochemicals extraction for synthetic natural gas (SNG) production, envisioning the development of a promising Brazilian ginseng roots valorization using sub/supercritical fluids in different steps. A multi-objective energetic-e
Braz. J. Chem. Eng.. Publicado em: 2017-07
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4. Optimization of a multi-residue method for 101 pesticides in green tea leaves using gas chromatography–tandem mass spectrometry
ABSTRACT A method for analysis of 101 pesticide residues in tea leaves was developed and validated for the first time. Pure acetonitrile was used as extraction solvent rather than acetonitrile after matrix hydration based on the amount of co-extracts and recoveries performance. During clean-up procedure, primary-secondary amine/graphitized carbon black (500
Rev. bras. farmacogn.. Publicado em: 2016-08
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5. Evaluation of pesticide residues in oranges from São Paulo, Brazil
Pesticides in “PERA” orange samples (N = 57) from São Paulo City, Brazil were assessed and the pesticide intake contribution was estimated for chronic risk assessment. Seventy-six pesticides were evaluated by the gas chromatography multi-residue method, including isomers and metabolites (4.332 determinations). The mean recoveries at the limit of quantif
Food Sci. Technol. Publicado em: 05/02/2016
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6. Elaboração de filmes biodegradáveis a partir do resíduo da extração do pigmento de Cúrcuma / Development of biodegradable films from the residue of the extraction of the pigment from turmeric.
This work aimed to study the potential of the bran residue obtained from the extraction of the pigment from turmeric (Curcuma longa L.) in the preparation of biodegradable films. The extraction of the turmeric dye was conducted by Soxhlet procedure in orer to simulate the industrial process. Two types of solvents were employed ethanol isopropanol (1:1) and m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/10/2012
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7. DESENVOLVIMENTO E VALIDAÇÃO DE MÉTODO MULTIRRESIDUAL PARA DETERMINAÇÃO DE PESTICIDAS EM CAFÉ VERDE UTILIZANDO GC-MS (NCI-SIM) / DEVELOPMENT AND VALIDATION A MULTI-RESIDUE METHOD FOR PESTICIDES DETERMINATION IN GREEN COFFEE USING GC-MS (NCI-SIM)
Neste estudo, foi desenvolvido e validado um método multirresidual para determinação de 40 pesticidas em grãos de café verde. Para se obter uma amostra bem homogênea, os grãos de café verde foram previamente moídos e em seguida preparou-se um slurry de café e água (razão 1:4, m/m). Para o procedimento de extração utilizou-se o método QuEChERS,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/01/2012
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8. MÉTODOS INDIVIDUAL E MULTIRRESIDUAL PARA DETERMINAÇÃO DE PESTICIDAS EM GRÃOS E DERIVADOS POR GC-PFPD, GC-ITD-MS E LC-MS/MS / SINGLE AND MULTI-RESIDUE METHODS FOR PESTICIDE ANALYSIS IN GRAINS AND DERIVATES BY GC-PFPD, GC-ITD-MS AND LC-MS/MS
Due to the complexity of grains like soybean, corn and rice, and the very low pesticide concentration expected for these samples, it is really necessary to develop efficient and reliable analytical methods to identify and quantify their residues. The possibility to perform the determination of a large number of pesticides in just a single chromatographic ana
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011
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9. Processing and characterization of epoxy nanocomposites with Mwcnt's/Cnf's using thinky and 3-roll shear mixing techniques
In this work, thinky mixing method was used to disperse multi-walled carbon nanotubes (MWCNT's) and carbon nanofibers (CNF's) in SC-1 epoxy either in isolation or in combination with 3-roll shear mixing. To achieve better dispersion, MWCNT mixing with SC-1 resin directly or pre-mixed with a solvent and then mixed with SC-1 resin after evaporating the solvent
Matéria (Rio de Janeiro). Publicado em: 2010
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10. Determinação de resíduos de agrotóxicos em mel de abelhas (Apis sp.) por cromatografia gasosa acoplada à espectrometria de massas
Among the problems concerning the quality of honey, are the physical and chemical characteristics, the identification of the floral and geographical origin, the occurrence of adulteration and contamination, especially with antibiotics and pesticides. The adequacy of these features to existing laws in the country makes the product more competitive for the exp
Publicado em: 2009
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11. DESENVOLVIMENTO E VALIDAÇÃO DE MÉTODO MULTIRRESÍDUO PARA DETERMINAÇÃO DE PESTICIDAS EM ARROZ POLIDO UTILIZANDO MÉTODO QuEChERS MODIFICADO, CLEAN-UP DISPERSIVO E GC-MS (NCI-SIM) / DEVELOPMENT AND VALIDATION OF MULTI-RESIDUE METHOD FOR PESTICIDES DETERMINATION IN POLISH RICE USING MODIFIED QuEChERS METHOD, DISPERSIVE CLEAN-UP AND GC-MS (NCI-SIM)
O arroz é o principal componente da dieta básica da população mundial. É, portanto, de extrema importância para a segurança alimentar e, em função disso, aspectos relacionados à sua produção e consumo devem ser continuamentemonitorados e avaliados em profundidade, para que o seu suprimento seja garantido. Neste estudo, foi desenvolvida e validada
Publicado em: 2007
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12. Reavaliação do contexto tectonico dos basaltos do greenstone belt do Rio Itapicuru (Bahia), com base na geoquimica de elementos-traço / Tectonic setting of basalts from the Rio Itapicuru greenstone belt revisited (Bahia, Bazil) by trace-element geochemistry
The Paleoproterozoic Rio Itapicuru Greenstone Belt, situated in the Serrinha Block - northeast São Francisco Craton, has a sequence of basaltic rocks whose tectonic setting is under discussion, i.e whether a back arc setting or intracontinental rift. The basalt geochemistry was revisited on the basis of incompatible trace elements data, such as high field s
Publicado em: 2007