Two extraction methods based on single drop microextraction (SDME) and hollow fiber liquid phase microextraction (HF-LPME) have been compared for the analysis of four pyrethroid insecticide (permethrin, cypermethrin, deltamethrin and fenvalerate) in environmental and wastewater samples by gas chromatography-flame ionization detection (GC-FID. For SDME, the analytes were extracted from a 3mL sample solution using 3.5 ?L of hexyl acetate using a 10 ?L GC syring. Experimental conditions including extraction solvent, solvent volume, ionic strength, extraction temperature and time, have been investigated optimal conditions were found to be. 3.5 ?L of hexyl acetate, stirring speed 600 rpm, NaCl concentration 20% (w/v), extraction time, 35min. For HF-LPME, the analytes were extracted from a 3mL sample solution using xylene using a 25 ?L HPLC syring. Optimal conditions were xylene as organic solvent, stirring speed 1500 rpm, NaCl concentration 30% (w/v) and extraction time, 20min. The results showed that extraction efficency by HF-LPME were 1.27-1.77 fold higher than SDME. Analytical parameters such as precision and limit of detection were also evaluated for HF-LPME technique. Analysis of the spiked water samples should that precision of 8.8-13.1%. Limits of detection for the four analytes were between 3.5 from 6.8 µg/L.
