Abstract
Soxhlet extraction has been successful at processing difficult to extract compounds from a variety of solid samples; however, the extraction is often time-consuming, uses large volumes of solvent, and can only process one sample at a time. This has been more evident in the sample preparation of coal and other complex geochemical samples for analysis by gas chromatography–mass spectrometry (GC–MS), where 72-h Soxhlet extractions are the norm. This study presents the development of a fast approach using a pressurized vessel system with either a hot air oven or microwave radiation heating. The techniques were tested with sub-bituminous (Powder River Range, Wyoming, U.S.A.) and bituminous (Fruitland Formation, Colorado, U.S.A.) coal samples. Performance of the pressure-vessel techniques in terms of extraction efficiency and extracted compound profiles (via GC–MS) were compared to that of a Soxhlet extraction. Overall 30–40% higher extraction efficiencies (by weight) were obtained with a 4 h hot air oven and a...
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