Sequential Determination
Mostrando 1-12 de 122 artigos, teses e dissertações.
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1. SEQUENTIAL MULTI-ELEMENT DETERMINATION OF TRACE-METALS IN BIODIESEL SAMPLES USING HR-CS FAAS
In this work the feasibility of sequential multi-element determination of Zn, Fe, Mg, Cu, Na, K, Cr, Al and Ca in biodiesel samples by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) was investigated. Biodiesel samples obtained from different sources and different chemical processes were analysed. The samples were diluted w
Quím. Nova. Publicado em: 2021-02
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2. DETERMINATION OF KINETIC ASYMMETRIES IN SOCCER PLAYERS PERFORMING VERTICAL JUMP: PROPOSAL OF A NOVEL PROCEDURE TO DETERMINE IMPULSE FROM FORCE PLATE DATA
RESUMO O primeiro objetivo do estudo foi comparar a assimetria do pico de força (Fpico) de membros inferiores em dois procedimentos de análise, simultâneo e sequencial, no salto com contramovimento (SCM) de futebolistas. Foram realizadas três séries de seis SCM em duas plataformas de força. Para o procedimento sequencial, os 18 SCM foram divididos em d
J. Phys. Educ.. Publicado em: 20/12/2019
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3. Validade do Modelo Hierárquico da Motivação Intrínseca e Extrínseca no Esporte Escolar
Resumo O tema do presente estudo é a autodeterminação. O objetivo foi testar o Modelo hierárquico da motivação intrínseca e extrínseca - MHMIE. Trata-se de um modelo teórico-explicativo linear, sequencial e unidirecional baseado na Teoria da Autodeterminação, que pressupõe a relação causal entre ‘fatores sociais’, ‘mediadores psicológico
Psico-USF. Publicado em: 10/10/2019
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4. Optimization of reinforced concrete polygonal sections under biaxial bending with axial force
Abstract Concrete is the world’s most utilized material for production of the structural elements employed in civil construction. Due to its low tensile strength and brittle nature it is reinforced with steel bars forming the reinforced concrete (RC structure). Linear elements of reinforced concrete are commonly employed in multi-story buildings, bridges,
Lat. Am. j. solids struct.. Publicado em: 04/10/2018
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5. Use of Mixture Design with Minimal Restrictions to Optimize an Extraction Procedure Employing Diluted Acids Assisted by Ultrasound and Microwave for Nutrient Element Determination in Vegetal Samples
In this work, it was developed an alternative analytical strategy for the preparation of vegetal samples extracted with diluted acids and assisted by ultrasound and microwave radiation for the determination of nutrients elements by fast sequential flame atomic absorption spectrometer. The conditions optimized using univariate and multivariate methodologies f
J. Braz. Chem. Soc.. Publicado em: 2018-06
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6. ANÁLISE POR INJEÇÃO SEQUENCIAL COM DETECÇÃO POR VOLTAMETRIA DE ONDA QUADRADA PARA DETERMINAÇÃO DE As(III) EM AMOSTRAS DE ÁGUAS USANDO ELETRODO DE OURO
A sequential injection method with square wave anodic stripping voltammetry (SI-SWASV) using screen printed and crystalline gold electrode was developed for determination of As(III). The carrier solution used for electrode conditioning and stripping medium was composed of 0.050 mol L-1 HCl, whereas the supporting electrode for samples (deposition medium) was
Quím. Nova. Publicado em: 2018-01
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7. Sequential Injection Analysis with Square Wave Voltammetry (SI-SWV) Detection for Investigation of Adsorption of Picloram on a Clay Soil
This paper describes a sequential injection analysis method, with detection by square wave voltammetry using a hanging mercury drop electrode, to determine the herbicide picloram in soil extracts (0.010 mol L-1 CaCl2). The method was applied for determination of the Freundlich parameters related to adsorption of picloram on a tropical soil sample. The major
J. Braz. Chem. Soc.. Publicado em: 2015-10
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8. Acute pancreatitis associated with boceprevir: a case report
Approximately 170 million people are infected with hepatitis C, and the sustained virological response rate to treatment with pegylated interferon and ribavirin is 30–50%. In an attempt to improve the chances of cure, boceprevir is being added to therapy, but it is associated with an increased incidence of adverse events. We herein report a case of acute p
Braz J Infect Dis. Publicado em: 2014-08
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9. Determination of metal associated with proteins of wheat seed samples after sequential extraction procedure
Este trabalho foi conduzido para estudar a distribuição de Cu, Fe, Mn e Zn nas frações proteicas de amostras de trigo submetidas a um procedimento de extração sequencial. Maiores concentrações dos elementos foram determinadas na fração extraída com tampão Tris-HCl contendo 1% de dodecil sulfato de sódio (SDS). As frações da amostra de trigo ob
J. Braz. Chem. Soc.. Publicado em: 2014-02
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10. Optimization method for sequential determination of Cu and Fe in airborne particulate matter collected on glass fiber filters by slurry sampling FAAS
Um método para determinação sequencial de Cu e Fe em material particulado atmosférico (APM) coletado em filtro de fibra de vidro por amostragem em suspensão e espectrometria de absorção atômica com chama é proposto. A otimização do método foi realizada utilizando-se uma massa de amostra seca em pó (filtro + APM) de 50 mg, dispersa em solução d
J. Braz. Chem. Soc.. Publicado em: 2013-04
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11. Distribuição de Zn, Pb, Ni, Cu, Mn e Fe nas frações do sedimento superficial do Rio Cachoeira na região sul da Bahia, Brasil
The metal distribution in the surface sediment fractions of the Cachoeira River was evaluated based on the fractionation method using a five-step sequential extraction. The determination of metals was made by flame atomic absorption spectrophotometry (F AAS). Zn, Pb and Cu exhibit higher concentrations in the residual fraction of the sediment from sites that
Quím. Nova. Publicado em: 2013
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12. Enteral nutrition discontinuation and outcomes in general critically ill patients
OBJECTIVE: To determine the relationship between enteral nutrition discontinuation and outcome in general critically ill patients. MATERIALS AND METHODS: All patients admitted to a mixed intensive care unit in a tertiary care hospital from May-August 2009 were screened for an indication for enteral nutrition. Patients were followed up until leaving the inten
Clinics. Publicado em: 2013