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Results on the application of high-temperature supercritical fluid extractions (HT-SFE) in the study of the speciation of hydrocarbons (HCs) in geological samples are presented. Two different shale samples were extracted by stepwise SFE at temperatures between 50 and 350°C. Highest relative extraction yields for aliphatic and aromatic hydrocarbons were obtained primarily at both end members of the...
The extraction and spectrophotometric quantitation of UO 2 (NO 3 ) 2 6H 2 O from different solid matrices is compared using ethanol solutions and supercritical carbon dioxide containing various combinations of 2,2-dimethyl-6,6,7,7,8,8,8-heptafluoro-3,5-octadione (FOD), tri-n-butylphosphate (TBP), and ethanol. The matrix is shown to have a tremendous effect on the extractability...
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