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Type: Artigo de periódico
Title: Application of mid infrared spectroscopy and iPLS for the quantification of contaminants in lubricating oil
Author: Borin, A
Poppi, RJ
Abstract: The feasibility of using a narrow spectral range in the mid infrared region for a rapid and conclusive determination of contaminants (gasoline, ethylene glycol and water) in lubricating oil was investigated. A graphically-oriented local multivariate calibration modeling procedure called interval partial least-squares (iPLS) was applied to select a spectral range that provides the lowest prediction error, in comparison to the full-spectrum model. The region from 650 to 784 cm(-1), attributed to aromatics, was selected for gasoline determination. The region from 918 to 1052 cm(-1), for C-O stretching from glycol, was selected for ethylene glycol determination. Finally, the region from 3598 to 3732 cm(-1), absorption from hydrogen bonded OH groups, was chosen for water determination. In the determinations, a root mean square error of prediction (RMSEP) of 0.34% for gasoline, 0.037% for ethylene glycol and 0.023% for water, were obtained after interval selection. (C) 2004 Elsevier B.V. All rights reserved.
Subject: lubricant
multivariate calibration
interval selection
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.vibspec.2004.05.003
Date Issue: 2005
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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