科研之友
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摘要
In this study, a novel technology of microwave-assisted-demulsification-dispersive liquid-liquid microextraction (MAD-DLLME) was developed for the extraction of polycyclic aromatic hydrocarbons (PAHs) in environmental water samples, which was followed by gas chromatography-mass spectrometry (GC-MS). The key to MAD-DLLME is based on the formation of an emulsion, where target analytes can partition between two phases, and subsequently employing microwave irradiation to achieve phase separation. To the best of our knowledge, it's the first time that microwave-assisted-demulsification has been introduced into sample preparation technology. Under the optimal conditions, the response of the proposed method was found to be linear in the concentration range of 0.05-10.0 g L-1 for most target analytes. The limits of detection for S/N = 3 ranged between 0.3 and 7.1 ng L-1, and relative standard deviations (RSDs) were in the range of 1.1-6.7%. Finally, water samples collected from West Lake and the Qiantang River (Hangzhou, China) were used for verification of the applicability of the developed method, which was demonstrated to be rapid, simple, efficient, reliable, and environmentally friendly.
