Abstract
To extract polyaromatic hydrocarbons (PAHs) from water samples using the Solid Phase Extraction (SPE) method. Based on hemimicelle/admicelle formation on the oxide surface, the cetyltrimethylammonium bromide-titanate nanotube system has been used as an adsorbent for PAHs extraction. Many experiments were conducted to optimize the extraction parameters, and resulting extracts were analyzed using Gas Chromatography-Flame Ionization Detection. Results showed that the kind and volume of elution solvent, the pH, volume, and concentrations of the sample, and the pH PAH and concentration of the cetyltrimethylammonium bromide significantly affect extraction yields. Under optimal conditions, modified TiO2 nanotubes exhibited their good enrichment capacity for PAHs (∼100%). Furthermore, the method of the analysis showed good linearity (R2 greater than 0.99), satisfactory repeatability (Relative standard deviation RSD between 4.8 and 11.2), and detection limits between 0.08 and 0.3 ng mL-1. The present SPE method showed competitive results with those given using multiwalled carbon nanotubes as adsorbent, and even better than those determined by the usual SPE-C18-silica method and liquid–liquid – extraction. The proposed method was applied to real water samples, and recoveries were between 80 and 99%, showing minimal matrix effect and the robustness of the optimized SPE method.
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