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Ultrasound-assisted headspace ionic-liquid microextraction of polycyclic aromatic hydrocarbons at elevated temperatures |
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| Authors: | Jing Xiao Jing Cheng Feng Guo Haili Hu Sha Peng Miao Zhang Min Cheng |
| Institution: | 1. Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, 430079, China 2. School of Mechanical Science and Engineering, Hua Zhong University of Science and Technology, Wuhan, 430074, China |
| Abstract: | We have developed a method for ultrasound-assisted ionic-liquid (IL) microextraction at elevated temperatures. A sealed pipette tip was used to hold the IL. The polycyclic aromatic hydrocarbons naphthalene, acenaphthene and fluorene were headspace-extracted into a 30-μL volume of the IL at 60 °C. Cooling is not needed to control the temperature of the extraction solvent because it has almost zero vapor pressure. Following extraction, the analyte-loaded IL was submitted to HPLC with fluorescence detection. Under the optimal conditions, the limits of detection (at S/N?=?3) are 30, 30 and 10 ng L?1 for naphthalene, acenaphthene and fluorene, respectively. Recoveries range from 86 to 110 %, and the extraction efficiency is better than previous methods by a factor of ~40. The technique was applied to the analysis of semivolatile pollutants (PAHs) in real aqueous samples. A new ultrasound-assisted headspace ionic liquid for a high temperature microextraction (UAHS- ILHTME) technique has been proposed. The schematic diagram of UAHS-ILME at elevated apparatus. (1) ultrasound water bath; (2) sample vial; (3) headspace phase; (4) rubber cover; (5) pipette tip; (6) extractant; (7) adiabatic baffle; (8) upper levels; (9) middle levels; (10) lower levels. |
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