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Modified dispersive liquid-liquid microextraction for pre-concentration of benzene, toluene, ethylbenzene and xylenes prior to their determination by GC |
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| Authors: | Hakim Faraji Alireza Feizbakhsh Masoumeh Helalizadeh |
| Institution: | 1. Department of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran 2. Department of Chemistry, Centeral Tehran Branch, Islamic Azad University, Tehran, Iran 3. Department of Physical Education, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran |
| Abstract: | We have developed a modified method for the extraction and preconcentration of benzene, toluene, ethylbenzene and xylenes (BTEX) in aqueous samples. It based on dispersive liquid-liquid microextraction along with solidification of floating organic microdrops. The dispersion of microvolumes of an extracting solvent into the aqueous occurs without dispersive solvent. Various parameters have been optimized. BTEX were quantified via GC with FID detection. Under optimized conditions, the preconcentration factors range from 301 to 514, extraction efficiencies from 60 to 103 %, repeatabilities from 2.2 to 4.1 %, and intermediate precisions from 3.5 to 7.0 %. The relative recovery for each analyte in water samples at three spiking levels is >85.6 %, with a relative standard deviation of <7.4 %. A modified method based on dispersive liquid-liquid microextraction to preconcentrate benzene, toluene, ethylbenzene and xylenes was investigated. The method was rapid, precise, efficient, and sensitive. Experimental parameters affecting the extraction process were evaluated. The optimized procedure was validated according to the ICH guidance. |
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