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Lookup NU author(s): Dr Barry Bennett, Professor Stephen Larter
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A solid-phase extraction (SPE) method employing silver nitrate impregnated silica has been developed and evaluated for the separation of defined aliphatic and aromatic hydrocarbons from crude oils. The versatility of the SPE method is demonstrated using a light crude oil from the North Sea and a heavy crude oil from Orcutt field (Monterey, California, U.S.A.). The coefficients of variation for a number of geochemical parameters measured on both aliphatic and aromatic hydrocarbons were excellent. The separation efficiency of SPE is demonstrated using quantification of monoaromatic steroid hydrocarbons which are notoriously difficult to efficiently sequester into the aromatic hydrocarbon fraction using traditional liquid chromatographic procedure. The selectivity and efficiency of the SPE technique is comparable with that of silica gel TLC. However, losses of volatile compounds such as naphthalene are limited during SPE since the sample remains in solvent. We conclude that solid-phase extraction affords rapid sample turnover suitable for processing large sample numbers with high reproducibility.
Author(s): Bennett B, Larter SR
Publication type: Article
Publication status: Published
Journal: Analytical Chemistry
Year: 2000
Volume: 72
Issue: 5
Pages: 1039-1044
ISSN (print): 0003-2700
ISSN (electronic): 1520-6882
Publisher: American Chemical Society
URL: http://dx.doi.org/10.1021/ac9910482
DOI: 10.1021/ac9910482
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