Acidic compounds in biodegraded petroleum |
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| Authors: | Tanja Barth Sylvi Hiland Per Fotland Kjell Magne Askvik Bent Skaare Pedersen Anna Elisabet Borgund |
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| Institution: | aDepartment of Chemistry, University of Bergen, Allegaten 41, N-5007 Bergen, Norway;bNorsk Hydro Research Centre, Reservoir Technology Group, P.O. Box 7190, N-5020 Bergen, Norway |
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| Abstract: | Twelve oil samples have been characterised by titration, FT-IR and chromatographic analysis to determine the differences between the organic acid composition of biodegraded and non-biodegraded oils. The biodegraded oils have higher total acid and total base contents, both by titration and extraction. The molecular weight ranges of the extracted acids are lowest in the biodegraded oils, and the equivalent weight calculations indicate a dominance of multi-functional molecules. Gel permeation chromatography gives a molecular weight range with most of the molecules between 300 and 500 g/mol. FT-IR shows that the extracted acids from biodegraded oils are more carboxylic and aliphatic while the non-degraded oils are more phenolic. Molecular analysis of the derivatised extracts give UCM envelopes for biodegraded oils, and no molecular identification. The results indicate that the acidic constituents in biodegraded oils are a product of the biodegradation, as the composition is very different from the non-biodegraded oils. |
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