Electrically assisted solid-phase microextraction combined with liquid chromatography-mass spectrometry for determination of parathion in water |
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Authors: | Tzung-Jie Yang |
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Affiliation: | Department of Chemistry, National Chung Hsing University, 250 Kuo-Kung Rd., Taichung 40223, Taiwan |
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Abstract: | A novel method for electrically assisted microextraction coupled to liquid chromatography-mass spectrometry was evaluated for determination of trace levels of parathion in water. A pencil lead electrode was used in a di-electrode system to extract parathion onto the electrode surface with a reductive potential applied. The optimum extraction conditions were found to be a potential of −600 mV for 60 s in pH 2 phosphate buffer solution. The parathion was desorbed statically for 1 min and dynamically for 3 min in the commercial SPME-HPLC desorption chamber, then analyzed with LC-APCI-MS/MS. The detection limit (LOD) for parathion in water was found to be 0.3 ng/mL. The proposed technique was demonstrated to be fast, sensitive and not require a solvent sample pretreatment. |
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Keywords: | Electrically assisted solid-phase microextraction Parathion Liquid chromatography-mass spectrometry |
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