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Abstract
The effects of extraction parameters on the microwave-assisted extraction (MAE) of polychlorinated biphenyls (PCBs) and polychlorinated dibenzodioxins (PCDDs) from fly ash were compared. The effects of toluene-isopropyl alcohol (IPA) mixture compositions, solvent volume, temperature, extraction time (rise and hold time), and microwave power on the variation of recoveries were studied. The MAE carried out at 100°C for 35.3 min using 5 mL of toluene-IPA (90 : 10, v/v) was more effective in isolating PCBs and PCDDs from fly ash. Multi-layer column chromatography on neutral and acidic silica gel with n-hexane was used for cleaning up the extracts. High performance liquid chromatography (HPLC) with ultraviolet (UV) detection was employed to identify and quantify the analytes.
ACKNOWLEDGMENT
This study was supported by grant No. (1999-2-12400-001-5) from the interdisciplinary research program of the KOSEF.