Microwave-Assisted Extraction of Polychlorinated Biphenyls and Polychlorinated Dibenzodioxins from Fly Ash (original) (raw)

Journal of Liquid Chromatography & Related Technologies, 2002

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.

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