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Inverse gas chromatography used to study lubricating oil oxidation mechanism via changes in Kovats and Flory-Huggins retention parameters.

Authors
  • Mostafa, Nagy E
  • Eissa, Elham A
Type
Published Article
Journal
Se pu = Chinese journal of chromatography / Zhongguo hua xue hui
Publication Date
May 01, 2006
Volume
24
Issue
3
Pages
284–289
Identifiers
PMID: 16929850
Source
Medline
License
Unknown

Abstract

Inverse gas chromatographic technique (IGC) was attempted as a new approach to follow the chemical changes that occur during lubricating base oil oxidation. Three groups of the oxidized base oils were prepared at different oxygen flow rates, periods and temperatures according to IP48 method. The corrected retention volumes (VR) were calculated for a series of selected test solutes possessing different functional groups on the oxidized base oils used as stationary phases. Kovats retention index (I), Flory-Huggins interaction parameter (Kinfinity1,2), and partial molar free energy of solution (deltaGinfinityL), were calculated for the given test solutes from their VR. The relationships between the I values and the oxidation variables were plotted and discussed. The obtained results were confirmed by potentiometric titration. The study reveals that the magnitudes of variation of I, Kinfinity1,2 or deltaGinfinityL retention parameters depend on the oxidation degree of the base oil. Large differences between the I values permit discrimination between the different oxidation steps.

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