iCONVERT: an integrated device for the UV-assisted determination of H2S via mid-infrared gas sensors

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPetruci, João Flavio da Silveira
dc.creatorCardoso, Arnaldo Alves
dc.creatorWilk, Andreas
dc.creatorKokoric, Vjekoslav
dc.creatorMizaikoff, Boris
dc.date2015-12-07T15:39:02Z
dc.date2016-10-25T21:24:00Z
dc.date2015-12-07T15:39:02Z
dc.date2016-10-25T21:24:00Z
dc.date2015-10-06
dc.date.accessioned2017-04-06T09:32:15Z
dc.date.available2017-04-06T09:32:15Z
dc.identifierAnalytical Chemistry, v. 87, n. 19, p. 9580-9583, 2015.
dc.identifier1520-6882
dc.identifierhttp://hdl.handle.net/11449/131628
dc.identifierhttp://acervodigital.unesp.br/handle/11449/131628
dc.identifier10.1021/acs.analchem.5b02731
dc.identifier26369573
dc.identifierhttp://dx.doi.org/10.1021/acs.analchem.5b02731
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/942168
dc.descriptionIn 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.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.relationAnalytical Chemistry
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleiCONVERT: an integrated device for the UV-assisted determination of H2S via mid-infrared gas sensors
dc.typeOtro


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