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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. Figure 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.
| Authors: | Jing Xiao, Jing Cheng, Feng Guo, Haili Hu, Sha Peng, Miao Zhang, Min Cheng | |
| Journal: | Microchimica Acta | |
| Year: | 2012 | |
| DOI: | 10.1007/s00604-012-0806-5 | |
| Publication date: | 30-03-2012 |
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