Microwave Oven Digestion
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Atomic Absorption Spectrometry as an Alternative to Determine the Presence of Gold Nanoparticles on or in Silica Matrix
Two different gold-silica-based nanomaterials were prepared: (i) silica-supported gold nanoparticles (AuNP/SiO2); and (ii) gold-silica core-shell nanoparticles (AuNP@SiO2). Three strategies for sample treatment (S), consisting in acid treatments, were employed: (S1) HNO3; (S2) HNO3 + HCl; and (S3) HF + HNO3 + HCl, applying microwave oven digestion for S2 and
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. PROCEDIMENTO VOLTAMÉTRICO OTIMIZADO PARA DETERMINAÇÃO DE Ni2+ EM AMOSTRAS PRÉ-TRATADAS DE BIODIESEL, USANDO ELETRODO MODIFICADO COM FILME DE MERCÚRIO / PROCEDURE OPTIMIZED VOLTAMMETRIC FOR DETERMINATION OF Ni2 + IN PRE-TREATED SAMPLES OF BIODIESEL, USING MODIFIED ELECTRODE WITH FILM OF MERCURY
A presença de metais no biodiesel pode estar relacionada com a matéria-prima, com o processo utilizado para a obtenção do biodiesel ou com sua estocagem e pode provocar reações de oxidação, corrosão e entupimento em motores, além de causar riscos à saúde humana e ao meio ambiente. Neste trabalho, é proposto um procedimento voltamétrico com base
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/07/2011
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3. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados
The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants. Carnauba wax is the unique among the natural waxes to have a combination of properties of great importance. In previous studies it was verified the presence of metals in wax composition
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2011
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4. Bovine liver sample preparation and micro-homogeneity study for Cu and Zn determination by solid sampling electrothermal atomic absorption spectrometry.
Abstract This work describes a systematic study for the bovine liver sample preparation for Cu and Zn determination by solid sampling electrothermal atomic absorption spectrometry. The main parameters investigated were sample drying, grinding process, particle size, sample size, microsample homogeneity, and their relationship with the precision and accuracy
Spectrochimica Acta Part B v. 60. Publicado em: 2011
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5. Determinação de Cu e Fe em Biodiesel por Espectrometria de Absorção Atômica com Atomização Eletrotérmica e Estudo do Efeito Catalítico destes Metais sobre a Estabilidade Oxidativa do Biodiesel / Determination of Cu and Fe in Biodiesel by Absorption Spectrometry Electrothermal atomic and Study of the Effect of Catalytic Metals on the Oxidative Stability of Biodiesel
The metals content in biodiesel is directly related with the raw material used and also with the utilized biodiesel production method. In this work, an evaluation of the main metals present in biodiesel samples from different sources was done. The qualitative analysis of the metal content was assessed using the Inductively Coupled Plasma Mass Spectrometry te
Publicado em: 2011
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6. Utilização de planejamento fatorial no preparo de amostras de detergente em pó para a determinação de fósforo por análise em fluxo
The decomposition of detergent powder samples in a microwave oven and autoclave was evaluated. To establish the best experimental conditions a 2(5) factorial design was performed, varying the conditions in autoclave and microwave digestion and flow system parameters for the determination of phosphorus. The best composition was: 0.2 mL sulfuric acid; 500 W po
Química Nova. Publicado em: 2010
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7. Availability of ca, cu, fe, mg and zn in bovine, pork and chicken meat samples raw and termically processed / Determinação da disponibilidade de Ca, Cu, Fe, Mg e Zn em amostras de carnes bovinas, suínas e de frango In natura e processadas termicamente
In this work, the availability of Ca, Cu, Fe, Mg, and Zn in bovine, pork and chicken meat samples raw and after thermal treatments: water boiled, grilled, microwave, convention oven I 180 oC (FCI) and conventional oven II 60 min and 180 oC was evaluated. Total determination of Ca, Cu, Fe, Mg and Zn in bovine and pork samples was performed by inductively coup
Publicado em: 2010
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8. Determination of nitrate in lettuce by ion chromatography after microwave water extraction
Lettuce is worldwide known as the most important vegetable. In this context, most farmers are searching new techniques for best quality products including hydropony. However, nitrate is of great concern, since it has a negative impact on human metabolism. The main objective of the present work was to evaluate the nitrate content of lettuce produced by conven
Química Nova. Publicado em: 2009
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9. DETERMINAÇÃO DE CÁDMIO E CHUMBO EM SANGUE POR ESPECTROMETRIA DE ABSORÇÃO ATÔMICA COM TUBO AQUECIDO NA CHAMA APÓS COMBUSTÃO INICIADA POR MICROONDAS
In this work a procedure for Cd and Pb determination by solid sampling flame furnace atomic absorption spectrometry after microwave induced combustion (MIC-FF-AAS) is used. Human blood samples were priory lyophilized, dried, ground, mixture with graphite, pressed and placed on a filter paper positioned on a quartz holder, that was introduced in a glass devic
Publicado em: 2007
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10. COMBUSTÃO INICIADA POR MICROONDAS E DETERMINAÇÃO EM LINHA DE CÁDMIO E CHUMBO EM PLANTAS POR ESPECTROMETRIA DE ABSORÇÃO ATÔMICA COM TUBO AQUECIDO NA CHAMA
In this work a new procedure is proposed by solid sampling flame furnace atomic absorption spectrometry after microwave induced combustion (MIC-FFAAS). The procedure was applied for the determination of cadmium and lead in botanical samples. Samples were groung, pressed and placed on a filter paper positioned on a quartz holder. The holder was placed in a gl
Publicado em: 2007
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11. "Comparative evaluation of procedures for agroindustrials sample preparation in the determination of inorganic elements by spctrometric techniques" / "Avaliação comparativa de procedimentos para o preparo de amostras agroindustriais na determinação de elementos inorgânicos por técnicas espectrométricas"
Analytical comparative procedures for the preparation of three types of agro industrials samples (rocks, coffees and antibiotics) were evaluated in the determination of inorganic elements by flame atomic absorption spectrometry (FAAS), flame atomic emission spectrometry (FAES) and graphite furnace atomic absorption spectrometry (GFAAS) techniques. Six decomp
Publicado em: 2006
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12. Determinação de ions metalicos em moluscos bivalves do manguezal da região petrolifera de São Francisco do Conde - Reconcavo Baiano / Determination of metallic ions in bivalve molluscs from the petroliferous region of São Francisco do Conde Mangrove - Reconcavo Baiano
The pollution of oceans, bays and estuaries as a result of industrial and domestic effluents that contain metallic ions is one of the most important factors that lead to the contamination of bivalve molluscs. These organisms are greatly affected by the bioaccumulation of inorganic species, even at low concentrations, reflecting the environmental contaminatio
Publicado em: 2006