Multivariate analysis of images in spectrophotometric methods: quantification of soil organic matter.

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dc.contributorPEDRO AUGUSTO DE OLIVEIRA MORAIS, UFG; DIEGO MENDES DE SOUZA, Polícia Civil, Distrito Federal, DF; BEATA EMOKE MADARI, CNPAF.
dc.creatorMORAIS, P. A. de O.
dc.creatorSOUZA, D. M. de
dc.creatorMADARI, B. E.
dc.date2022-02-16T12:01:54Z
dc.date2022-02-16T12:01:54Z
dc.date2022-02-16
dc.date2021
dc.date.accessioned2026-07-01T00:06:44Z
dc.descriptionSoil organic matter (SOM) is usually quantified by Walkley-Black titration method or using a spectrophotometric method. This study proposes an alternative method for quantification of SOM using digital image from scanner and mathematical algorithms to replace titration and spectrophotometry procedures. For this, after SOM oxidation by potassium dichromate, digital images were acquired. Posteriorly, extraction of RGB color histograms from images have occurred, followed by the use of multivariate calibration method: partial least squares (PLS). Six soil samples were analyzed. We used the Walkley-Black method as reference. SOM was estimated by images using the PLS tool. The new method, besides being a fast, low cost, and more operational alternative, presented statistically equal results in relation to the reference method, as assessed by the Student t-test and F-test at 95 % confidence.
dc.identifierEuropean Journal of Chemistry, v. 12, n. 4, p. 377-381, Dec. 2021.
dc.identifier2153-2257
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1140128
dc.identifier10.5155/eurjchem.12.4.377-381.2122
dc.identifier.urihttp://hdl.handle.net/123456789/397596
dc.languageeng
dc.rightsopenAccess
dc.subjectWalkley-Black method
dc.subjectPartial least squares
dc.subjectMatéria Orgânica
dc.subjectSolo
dc.subjectEspectrometria
dc.subjectSoil organic matter
dc.subjectScanners
dc.subjectDigital images
dc.subjectSpectrophotometers
dc.titleMultivariate analysis of images in spectrophotometric methods: quantification of soil organic matter.
dc.typeArtigo de periódico

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