Electrothermal Atomization
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Determinación simultánea de Cr, Ni y V en orina mediante et aas
A procedure for the simultaneous determination of Cr, Ni, and V in urine by electrothermal atomic absorption spectrometry (ET AAS) was optimized by factorial design, and performed at a pyrolysis and atomization temperatures of 1300 and 2500 ºC, respectively, using 15 µg de Mg(NO3)2 as chemical modifier. Characteristics mass of 14, 6 and 220 ρg and detecti
Química Nova. Publicado em: 2011
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2. 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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3. 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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4. DETERMINAÇÃO DAS CONSTANTES DE ESTABILIDADE DOS COMPLEXOS FORMADOS ENTRE OS AMINOÁCIDOS CISTEÍNA, N-ACETILCISTEÍNA E LISINA COM CHUMBO EM SOLUÇÃO AQUOSA / DETERMINATION OF STABILITY CONSTANTS FOR LEAD COMPLEXES WITH CYSTEINE, N-ACETYLCYSTEINE AND LYSINE IN AQUEOUS SOLUTIONS
In this study we investigated the interaction between lead and the amino acid cysteine, lysine and N-acetylcysteine by testing long-term contact with ion exchanger resins and also the determination of stability constants. The importance of investigating the presence of lead in solutions for parenteral nutrition is related to the risk of internal contaminatio
Publicado em: 2011
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5. Construção de espectrômetro de emissão atômica com atomização eletrotérmica em filamento de tungstênio (WCAES)
It is here discussed the development of a low cost analytical instrument with capacity for metals determination using atomic emission measurements in an electrothermal atomization system with a tungsten coil atomizer. The main goal was to show a new frontier for using this atomizer and to demonstrate that the simple instrumental arrangement here proposed has
Química Nova. Publicado em: 2010
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6. Determinação de Selênio em água subterânea utilizando a espectrometria de absorção atômica com atomização eletrotérmica em forno de grafita (GFAAS) e geração de hidretos (HGAAS) / Determination of selenium in underground water using atomic absorption spectrometry with graphite furnace (GFAAS) and hydride generation (HGAAS)
Report carried out for CETESB in 2006 showed 80% of the 645 cities are totally or partially supplied by underground water, and for 13 river basins of São Paulo State the underground water is the priority source for potable water supply. The use of underground water in different sectors reinforces its importance and highlight the concern about their protecti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/12/2008
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7. Evaluation of eletrothermal atomic absorption spectrometry with tungsten coil for the direct determination of arsenic in waters / Avaliação da espectrometria de absorção atômica com atomização eletrotérmica em filamento de tungstênio para determinação de arsênio em águas
A determinação direta de arsênio total em águas por espectrometria de absorção atômica com filamentos de tungstênio (150 W) modificados quimicamente com irídio ou ródio, representa uma alternativa para a atomização eletrotérmica de arsênio, que foi avaliada na presente dissertação. A utilização do revestimento com Ir como modificador quími
Publicado em: 2008
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8. Estudo da utilização de padrão interno em determinações multielementares por espectrometria de absorção atômica com atomização eletrotérmica e detecção simultânea / Study of the use of internal standard for multielement determinations by electrothermal atomic absorption spectrometry with simultaneous detection
A systematic study involving the use of internal standard for multielement determinations by electrothermal atomic absorption spectrometry was developed. The main objective of this work was evaluate the possibility of improving precision and accuracy of the analytical results for biological fluids. The sample pre-treatment was reduced to a single dilution st
Publicado em: 2004
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9. Determinação de As em amostras orgânicas de interesse ambiental por espectrometria de absorção atômica com atomização eletrotérmica após combustão em bomba de O2
The toxicity of the major As species present in the environment justifies the effort for quantifying the element in environmental organic samples, which can vary from animal and vegetal tissues to coal and industrial residues. This paper comments about the applicability of the O2 bomb digestion, as a general procedure for all environmental organic materials.
Química Nova. Publicado em: 2003-10
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10. ATOMIC FLUORESCENCE SPECTROSCOPIC METHODS FOR ULTRATRACE ELEMENTAL ANALYSIS USING A HIGH- REPETITION RATE TUNABLE DYE LASER AND FURNACE SAMPLE ATOMIZATION
The goal of this work was to develop ultrasensitive methods based on Electrothermal atomization laser-excited atomic fluorescence (ETA-LEAFS) to determine Ge, In, Pb, Pt and Tm in complex samples such as biological and environmental. The ultimate goal was to achieve high sensitivity and high selectivity with little sample manipulation and simple sample calib
Publicado em: 1999