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dc.contributor.authorPetruci, João Flavio da Silveira-
dc.contributor.authorCardoso, Arnaldo Alves-
dc.contributor.authorWilk, Andreas-
dc.contributor.authorKokoric, Vjekoslav-
dc.contributor.authorMizaikoff, Boris-
dc.identifier.citationAnalytical Chemistry, v. 87, n. 19, p. 9580-9583, 2015.-
dc.description.abstractIn this technical note, we describe an integrated device platform for performing in-flow gaseous conversion reactions based on ultraviolet (UV) irradiation. The system combines, using the same footprint, an integrated UV-conversion device (iCONVERT), a preconcentrator unit (iPRECON), and a new generation of mid-infrared (MIR) gas cell simultaneously serving as a photon conduit, i.e., so-called substrate-integrated hollow waveguide (iHWG) optically coupled to a compact Fourier transform-infrared (FT-IR) spectrometer. The iCONVERT is assembled from two blocks of aluminum (dimensions, 75 mm × 50 mm × 40 mm; L × W × D) containing 4 miniaturized UV-lamps (47mm × 6 mm × 47 mm each). For the present study, the iPRECON-iCONVERT-iHWG sensing platform has specifically been tailored to the determination of H2S in gaseous samples. Thereby, the quantitative UV-assisted conversion of the rather weak IR-absorber H2S into the more pronouncedly responding SO2 is used for hydrogen sulfide detection. A linear calibration model was established in the range of 7.5 to 100 ppmv achieving a limit of detection at 1.5 ppmv using 10 min of sample preconcentration (onto Molecular Sieve 5A) at a flow rate of 200 mL min(-1). When compared to a conventional UV-conversion system, the iCONVERT revealed similar performance. Considering the potential for system miniaturization using, e.g., dedicated quantum cascade lasers (QCL) in lieu of the FT-IR spectrometer, the developed sensing platform may be further evolved into a hand-held device.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.titleiCONVERT: an integrated device for the UV-assisted determination of H2S via mid-infrared gas sensorsen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversity of Ulm-
dc.description.affiliationSão Paulo State University (UNESP), Department of Analytical Chemistry, CEP 14800-970, Araraquara, São Paulo, Brazil-
dc.description.affiliationUniversity of Ulm , Institute of Analytical and Bioanalytical Chemistry, 89081, Ulm, Germany.-
dc.description.affiliationUnespSão Paulo State University (UNESP), Department of Analytical Chemistry, CEP 14800-970, Araraquara, São Paulo, Brazil.-
dc.description.sponsorshipIdFAPESP: 2014/23974-3-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofAnalytical Chemistry-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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