Ring-Oven Based Preconcentration Technique for Microanalysis: Simultaneous Determination of Na, Fe, and Cu in Fuel Ethanol by Laser Induced Breakdown Spectroscopy

dc.creatorCortez, J
dc.creatorPasquini, C
dc.date2013
dc.dateFEB 5
dc.date2014-07-30T18:28:00Z
dc.date2015-11-26T16:53:24Z
dc.date2014-07-30T18:28:00Z
dc.date2015-11-26T16:53:24Z
dc.date.accessioned2018-03-28T23:40:31Z
dc.date.available2018-03-28T23:40:31Z
dc.identifierAnalytical Chemistry. Amer Chemical Soc, v. 85, n. 3, n. 1547, n. 1554, 2013.
dc.identifier0003-2700
dc.identifier1520-6882
dc.identifierWOS:000314676100045
dc.identifier10.1021/ac302755h
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/71116
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/71116
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1276572
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionThe ring-oven technique, originally applied for classical qualitative analysis in the years 1950s to 1970s, is revisited to be used in a simple though highly efficient and green procedure for analyte preconcentration prior to its determination by the microanalytical techniques presently available. The proposed preconcentration technique is based on the dropwise delivery of a small volume of sample to a filter paper substrate, assisted by a flow-injection-like system. The filter paper is maintained in a small circular heated oven (the ring oven). Drops of the sample solution diffuse by capillarity from the center to a circular area of the paper substrate. After the total sample volume has been delivered, a ring with a sharp (ca. 350 mu m) circular contour, of about 2.0 cm diameter, is formed on the paper to contain most of the analytes originally present in the sample volume. Preconcentration coefficients of the analyte can reach 250-fold (on a m/m basis) for a sample volume as small as 600 mu L. The proposed system and procedure have been evaluated to concentrate Na, Fe, and Cu in fuel ethanol, followed by simultaneous direct determination of these species in the ring contour, employing the microanalytical technique of laser induced breakdown spectroscopy (LIBS). Detection limits of 0.7, 0.4, and 0.3 mu g mL(-1) and mean recoveries of (109 +/- 13)%, (92 +/- 18)%, and (98 +/- 12)%, for Na, Fe, and Cu, respectively, were obtained in fuel ethanol. It is possible to anticipate the application of the technique, coupled to modern microanalytical and multianalyte techniques, to several analytical problems requiring analyte preconcentration and/or sample stabilization.
dc.description85
dc.description3
dc.description1547
dc.description1554
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageen
dc.publisherAmer Chemical Soc
dc.publisherWashington
dc.publisherEUA
dc.relationAnalytical Chemistry
dc.relationAnal. Chem.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectInduced Plasma Spectroscopy
dc.subjectAqueous-solution
dc.subjectSingle-pulse
dc.subjectSpectrochemical Analysis
dc.subjectPlant Materials
dc.subjectTrace-element
dc.subjectWater
dc.subjectLiquids
dc.subjectSpectrometry
dc.subjectMetals
dc.titleRing-Oven Based Preconcentration Technique for Microanalysis: Simultaneous Determination of Na, Fe, and Cu in Fuel Ethanol by Laser Induced Breakdown Spectroscopy
dc.typeArtículos de revistas


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