Gota suspensa para avaliação de aldeído total no ar interno e externo do ambiente

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dc.contributor.authorPereira, Elisabete A. [UNESP]
dc.contributor.authorCardoso, Arnaldo Alves [UNESP]
dc.contributor.authorDasgupta, Parnendu K.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionTexas Tech Universtiy Department of Chemistry and Biochemistry
dc.date.accessioned2014-05-20T14:19:43Z
dc.date.available2014-05-20T14:19:43Z
dc.date.issued2001-08-01
dc.description.abstractA sensitive and simple system was proposed for the in situ measurement of total aldehyde in outdoor or indoor ambient. The method is based on the use of a reagent drop as an useful interface to preconcentrate the sample prior to determination of total aldehyde as formaldehyde. The drop is formed at the tip of a cylindrical tube that contains two optical fibers placed on opposite sides and in contact with the reagent solution. One optical fiber carries the red light to the drop form a light emitting diode (LED). The transmitted light is measured by a second optical fiber/photodiode system. The analytical signal is read and converted into absorbance. The reagent solution of 3-methyl-2-benzothiazoline hydrazone (MBTH) forms a blue cation during reaction with formaldehyde that can be measured at 660 nm. Some aspects of kinetics reaction formation of dye were reevaluated. The formaldehyde reacts with MBTH and forms the azine in about 12 min. The oxidation of MBTH by Fe (III) and the formation of dye requires 3 min. The absorbance of the reagent drop is proportional to the sampling time and to the analyte concentration. The absorbance signal increases with increased sample gas flow until a maximum is reached then decreases until it forms a plateau. The proposed method was evaluated using both outdoor and indoor samples, and it was shown to viable provide an accurate measure of total aldehyde.en
dc.description.affiliationUniversidade Estadual Paulista Instituto de Química Departamento de Química Analítica
dc.description.affiliationTexas Tech Universtiy Department of Chemistry and Biochemistry
dc.description.affiliationUnespUniversidade Estadual Paulista Instituto de Química Departamento de Química Analítica
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent443-448
dc.identifierhttp://dx.doi.org/10.1590/S0100-40422001000400003
dc.identifier.citationQuímica Nova. Sociedade Brasileira de Química, v. 24, n. 4, p. 443-448, 2001.
dc.identifier.doi10.1590/S0100-40422001000400003
dc.identifier.fileS0100-40422001000400003.pdf
dc.identifier.issn0100-4042
dc.identifier.lattes9165109840414837
dc.identifier.scieloS0100-40422001000400003
dc.identifier.urihttp://hdl.handle.net/11449/25940
dc.language.isopor
dc.publisherSociedade Brasileira de Química
dc.relation.ispartofQuímica Nova
dc.relation.ispartofjcr0.646
dc.relation.ispartofsjr0,255
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectaldehydeen
dc.subjectsuspended dropleten
dc.subjectair analysisen
dc.titleGota suspensa para avaliação de aldeído total no ar interno e externo do ambientept
dc.title.alternativeSuspended droplet for evaluation of total aldehyde in outdoor and indoor ambienten
dc.typeArtigo
unesp.author.lattes9165109840414837[2]
unesp.author.orcid0000-0003-2046-995X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Analítica - IQ