Evaluation of the analyses of tert-butyldimethylsilyl derivatives of naphthenic acids by gas chromatography-electron impact mass spectrometry |
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Authors: | Clemente Joyce S Fedorak Phillip M |
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Institution: | Department of Biological Sciences, University of Alberta, Edmonton, Alta., Canada T6G 2E9. |
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Abstract: | Naphthenic acids are a complex mixture of carboxylic acids with the general formula CnH(2n+Z)O2 and they are natural, toxic components of crude oils. GC-MS analyses of tert-butyldimethylsilyl esters of naphthenic acids are used to estimate component distribution within naphthenic acids mixtures. Our evaluations of the GC-MS method showed that ions from column bleed erroneously appear as C14 Z = -4 acids and that correcting for heavy isotopes of C and Si do not significantly affect ion distribution plots. Overall, the GC-MS method appears to overestimate the relative proportion of low-molecular-mass acids. |
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Keywords: | Derivatization GC Oil sands Petroleum Naphthenic acids Butyldimethylsilyl esters Organic acids |
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