Influence of microwave heating on fluoride, chloride, nitrate and sulfate concentrations in water

dc.creatorFigueiredo, EC
dc.creatorDias, JC
dc.creatorKubota, LT
dc.creatorKorn, M
dc.creatorOliveira, PV
dc.creatorArruda, MAZ
dc.date2011
dc.dateOCT 15
dc.date2014-08-01T18:31:41Z
dc.date2015-11-26T17:00:30Z
dc.date2014-08-01T18:31:41Z
dc.date2015-11-26T17:00:30Z
dc.date.accessioned2018-03-28T23:48:16Z
dc.date.available2018-03-28T23:48:16Z
dc.identifierTalanta. Elsevier Science Bv, v. 85, n. 5, n. 2707, n. 2710, 2011.
dc.identifier0039-9140
dc.identifierWOS:000296115600068
dc.identifier10.1016/j.talanta.2011.08.003
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/80213
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/80213
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1278487
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionThis paper describes a study about the influence of microwave radiation using closed vessels on fluoride, chloride, nitrate and sulfate concentrations in aqueous media. The experiments were processed by heating water using PFA vessels and a microwave cavity oven, determining the anions by ion chromatography. The influence of the exposure time, the atmospheric composition, the kind of heating (water bath or microwave radiation) and the possible formation of hydrogen peroxide were investigated. The limits of quantification for fluoride, chloride, nitrate and sulfate were respectively of 0.17, 0.15, 0.55 and 0.57 mu g L-1, and precision, expressed as RSD, was <4% for all considered anions. The hydrogen peroxide was quantified by spectrophotometry, and the limit of quantification and precision were 24 mu g L-1 and <5% (n = 10), respectively. The results demonstrate a significant increase in the anion concentration levels (between 63 and 89%) when microwave heating was used in comparison with heating by water bath. In addition, these changes observed can be mainly attributed to the species transfers, either between gaseous (atmospheric gases) and liquid (water) phases for nitrate, or between vessels walls and water for fluoride, chloride and sulfate. Additionally, hydrogen peroxide concentration higher than 45 mu g L-1 was determined when water was exposed to microwave radiation. (C) 2011 Elsevier B.V. All rights reserved.
dc.description85
dc.description5
dc.description2707
dc.description2710
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFinanciadora de Estudos e Projetos (FINEP, Brazil)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationTalanta
dc.relationTalanta
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectMicrowave heating
dc.subjectAnions generation
dc.subjectPFA vessel
dc.subjectFluoride
dc.subjectChloride
dc.subjectNitrate
dc.subjectSulfate
dc.subjectAtomic-absorption-spectrometry
dc.subjectDiluted Nitric-acid
dc.subjectAssisted Synthesis
dc.subjectDigestion Procedures
dc.subjectSamples
dc.subjectFlame
dc.subjectExtraction
dc.subjectSystem
dc.subjectCobalt
dc.titleInfluence of microwave heating on fluoride, chloride, nitrate and sulfate concentrations in water
dc.typeArtículos de revistas


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