Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10564476 | Vibrational Spectroscopy | 2005 | 6 Pages |
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 784Â cmâ1, attributed to aromatics, was selected for gasoline determination. The region from 918 to 1052Â cmâ1, for CâO stretching from glycol, was selected for ethylene glycol determination. Finally, the region from 3598 to 3732Â cmâ1, 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.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Alessandra Borin, Ronei J. Poppi,