Abstract
The extraction of native polynuclear aromatic hydrocarbons (PAHs) from house dust is studied using supercritical fluid extraction (SFE-CO 2 ); direct modified SFE; and mixtures of 10, 20, 30, and 40 mole percent methanol in CO 2. The temperatures studied are 50, 75, and 100°C. For the direct modified SFE experiments, the effect of adding 100 and 200 L of methanol and 100 μL of water directly to the sample at 75 and 100°C is studied. The properties of the PAHs and of the dust matrix are used to explain the patterns observed in the recovery yields. The increase in the solvent strength of the methanol-CO2 mixtures greatly increases the recoveries and decreases the total extraction time. Also, an increase in the extraction temperature positively affects the yields. The direct modified SFE and SFE-CO 2 experiments give similar extraction yields, and the extractions with the binary mixtures give optimum results.
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