Title:	Classificação de águas minerais baseada em imagens digitais obtidas por smartphones
Other Titles:	Classification of mineral waters based on digital images acquired by smartphones
Authors:	Silva Neto, Gerson F. Fonseca, Alexandre Braga, Jez Willian Batista
Assunto::	Telefonia celular Águas minerais Colorimetria
Issue Date:	Aug-2016
Publisher:	Sociedade Brasileira de Química
Citation:	SILVA NETO, Gerson F.; FONSECA, Alexandre; BRAGA, Jez W. B. Classificação de águas minerais baseada em imagens digitais obtidas por smartphones. Química Nova, São Paulo, v. 39, n. 7, p. 876-881, ago. 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000700876&lng=en&nrm=iso>. Acesso em: 12 mar. 2018. doi: http://dx.doi.org/10.5935/0100-4042.20160088.
Abstract:	This work describes a new procedure for classification of mineral waters based on digital images acquired by smartphones. Commercial waters from eight mineral springs plus distilled water and tap water were combined with eriochrome T black or murexide and transferred to a cuvette, which was positioned into a light controlled chamber. RGB (Red, Blue and Green) measurements of cuvette images were acquired in real time, using a free smartphone app, and employed as variables for the exploratory analysis. 2D data dispersion along component B for murexide (x axis) and component R for eriochrome T black (y axis) provides the clear visualization of clusters using the raw variables. Hierarchical cluster analysis (HCA) applied to this data confirmed the efficient discrimination of samples providing the characterization of nine clusters for the ten classes of water investigated. The classification of samples based on a k-nearest neighbors (k-NN) modelled to the efficiency rate of 100% for 8 classes and of 94.4% and 50% for the remaining classes, respectively, indicating the adequate performance of the proposed strategy. Considering the facilities to acquire the data, such as low cost instrumentation and reagents, and the rapidity of the procedures, this alternative may be applied for verification of commercial water adulteration.
metadata.dc.description.unidade:	Instituto de Química (IQ) Instituto de Química (IQ)
Licença::	Química Nova - Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado (CC BY NC 4.0). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016000700876&lng=en&nrm=iso. Acesso em: 12 mar. 2018.
DOI:	http://dx.doi.org/10.5935/0100-4042.20160088
Appears in Collections:	Artigos publicados em periódicos e afins

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