A Simple Technique Based on Digital Images for Determination of Nitrogen Dioxide in Ambient Air

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dc.contributor.authorde França Souza, Pedro Augusto [UNESP]
dc.contributor.authorAraújo Neto, José Lozano [UNESP]
dc.contributor.authorCardoso, Arnaldo Alves [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2021-06-25T11:11:50Z
dc.date.available2021-06-25T11:11:50Z
dc.date.issued2021-02-01
dc.description.abstractThe lockdown to prevent the coronavirus spread resulted in an immediate reduction in gas concentration worldwide. This fact shows the importance of nitrogen dioxide as a pollutant gas directly associated with human activities. For indoor exposure, NO2 has been associated with effects on the respiratory system. In outdoor environments, ozone reaches a maximum after NO2 peaks, and acid rain arises with NO2 oxidation to forms nitric acid. Therefore, monitoring the NO2 concentration in atmospheric air can help prevent respiratory diseases and lower the concentration of other atmospheric pollutants. The experiment proposed in this article uses a low-cost passive sampler for the NO2 collection. An innovative and straightforward technique to determine the gas concentration through a gel-dyed formation and based on digital image analysis RGB colors channel are split by the software ImageJ. Results of digital image analysis and spectrophotometry were statistically agreed at a 95% confidence level. The advantages of the technique include low cost, the ready availability of components, ease of use, and sensitivity. The achievable resolution of nitrogen dioxide concentrations is 9 ppb for 24-h sampling.en
dc.description.affiliationDepartment of Analytical Chemistry São Paulo State University UNESP
dc.description.affiliationUnespDepartment of Analytical Chemistry São Paulo State University UNESP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 310065/2016-0
dc.description.sponsorshipIdCNPq: 481505/2013-0
dc.identifierhttp://dx.doi.org/10.1007/s11270-021-05031-4
dc.identifier.citationWater, Air, and Soil Pollution, v. 232, n. 2, 2021.
dc.identifier.doi10.1007/s11270-021-05031-4
dc.identifier.issn1573-2932
dc.identifier.issn0049-6979
dc.identifier.scopus2-s2.0-85101005980
dc.identifier.urihttp://hdl.handle.net/11449/208416
dc.language.isoeng
dc.relation.ispartofWater, Air, and Soil Pollution
dc.sourceScopus
dc.subjectAir pollution
dc.subjectAir quality
dc.subjectColorimetry
dc.subjectDigital image analysis
dc.subjectNO2 monitoring
dc.subjectPassive sampling
dc.titleA Simple Technique Based on Digital Images for Determination of Nitrogen Dioxide in Ambient Airen
dc.typeArtigo
unesp.author.orcid0000-0003-2046-995X[3]

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Artigos - Química Analítica - IQ