European Journal of Chemistry

Multivariate analysis of images in spectrophotometric methods: Quantification of soil organic matter

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Pedro Augusto de Oliveira Morais
Diego Mendesde Souza
Beata Emoke Madari

Abstract

Soil 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.


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Morais, P. A. de O.; Souza, D. M.; Madari, B. E. Multivariate Analysis of Images in Spectrophotometric Methods: Quantification of Soil Organic Matter. Eur. J. Chem. 2021, 12, 377-381.

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Supporting Agencies

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil
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