Discrimination of Organic Solvents Using an Infrared-Emitting Diode-Based Analyzer. Part I: Feasibility

Authors: Bonanno, Anthony S.1; Griffiths, Peter R.2

Source: Applied Spectroscopy, Volume 49, Issue 11, Pages 1545-1719 (November 1995) , pp. 1590-1597(8)

Publisher: Society for Applied Spectroscopy

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This report demonstrates the feasibility of discriminating organic solvents on the basis of short-wave near-infrared spectra (from 0.7 to 1.1 μm). Both library searching and multivariate statistical methods were applied to 8-cm-1 spectra and to spectra de-resolved to the point achievable with an analyzer using discrete infrared-emitting diode sources. Library searching performed satisfactorily if the unknown and library spectra were collected under reasonably similar conditions, but performed poorly if the temperature of hydrogen-bonding solvents was varied. A multivariate discrimination technique based on Mahalanobis distance computation was capable of discriminating between several alcohols while allowing for a temperature variation of 20°C. These results indicate that a very low resolution (on the order of 100 cm-1) short-wave near-infrared analyzer can achieve successful discrimination between similar solvents under variable conditions.

Keywords: Analyzer; Discrimination; Near-infrared; Solvents

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953965650

Affiliations: 1: Department of Chemistry, University of Idaho, Moscow, Idaho 83843; present address: Advanced Fuel Research, 87 Church St., East Hartford, CT 06108 2: Department of Chemistry, University of Idaho, Moscow, Idaho 83843

Publication date: November 1, 1995

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