Buscar
Mostrando ítems 31-40 de 107
Flame AAS determination of metal ions in fuel ethanol after preconcentration on acid carboxymethylcellulose (CMCH)
(Elsevier B.V., 1999-01-01)
This paper describes the preparation of acid carboxymethylcellulose (CMCH), and the results of a study on the adsorption and preconcentration (using batch and flow-through column methods) of Cd(II), Cu(II), Cr(III), Fe(III), ...
Direct determination of Al, As, Cu, Fe, Mn, and Ni in fuel ethanol by simultaneous GFAAS using integrated platforms pretreated with W-Rh permanent modifier together with Pd plus Mg modifier
(Perkin-elmer Corp, 2002-11-01)
A method is proposed for the simultaneous determination of Al, As, Cu, Fe, Mn, and Ni in fuel ethanol by electrothermal atomic absorption spectrometry (ETAAS) using W-Rh permanent modifier together with Pd(NO3)(2) + ...
Preconcentration and determination of metal ions from fuel ethanol with a new 2,2'-dipyridylamine bonded silica
(2013-02-01)
A silica surface chemically modified with [3-(2,2'-dipyridylamine) propyl] groups was prepared, characterized, and evaluated for its metal ion preconcentration in fuel ethanol. To our knowledge, we are the first authors ...
Electroanalysis and determination of acetaldehyde in fuel ethanol using the reaction with 2,4-dinitrophenylhydrazine
(Springer, 2006-09-01)
The voltammetric reduction of acetaldehyde was studied in 0.1 M LiOH: LiCl (60: 40 v/v). Welldefined waves can be seen at -1.77 and -1.60 V with the use of hanging mercury and glassy carbon electrodes. Acetaldehyde was ...
Simultaneous Determination of Ba, Cr, Mo (Group 1), and Cu, Fe, Ni, and Pb (Group 2) in Commercial Fuel Ethanol by Graphite Furnace AAS
(Perkin-elmer Corp, 2008-11-01)
The direct and simultaneous determination of Ba, Cr, and Mo (group 1) and of Cu, Fe, Ni, and Pb (group 2) in commercial fuel ethanol by graphite furnace atomic absorption spectrometry is proposed employing no chemical ...
Evaluation of Ir and Pd(NO3)(2)/Mg(NO3)(2) as Modifiers for the Simultaneous Determination of Mn, Ni, Pb, and Sb in Fuel Ethanol by Graphite Furnace MS
(Perkin-elmer Corp, 2010-07-01)
The mixture Pd(NO3)(2)/Mg(NO3)(2) and an Ir-coated platform co-injected with Pd(NO3)(2)/Mg(NO3)(2) were evaluated as modifiers for the direct and simultaneous determination of Mn, Ni, Pb, and Sb in fuel ethanol by graphite ...
Analytical methods employed at quality control of fuel ethanol
(American Chemical Society, 2016)
Flammability limits: A review with emphasis on ethanol for aeronautical applications and description of the experimental procedure
(Elsevier B.V., 2012-11-30)
The lower and upper flammability limits of a fuel are key tools for predicting fire, assessing the possibility of explosion, and designing protection systems. Knowledge about the risks involved with the explosion of both ...
Eletroanálise de derivados acetaldeído com hidrazina e determinação em amostras de álcool combustível por voltametria de onda quadrada
(Sociedade Brasileira de Química, 2006-07-01)
A square wave voltammetric method is described for the determination of acetaldehyde using the derivatization reaction with hydrazine sulphate, based on the reduction of hydrazone generated as a product that exhibits a ...
Quantification of water in ethanol using a photothermal transparent transducer
(2013-02-08)
Ethanol with added water may be found during the process of assessing its physical and chemical properties. This addition can damage automotive vehicle engines and also may contribute to tax evasion. The present contribution ...