Analysis of Polycyclic Aromatic Hydrocarbons in Water Samples Using Deep Eutectic Solvent as a Dispersant in Dispersive Liquid–Liquid Microextraction Based on the Solidification of Floating Organic Droplet

A novel dispersive liquid–liquid microextraction method based on the solidification of a floating organic droplet was proposed to pre-concentrate 16 polycyclic aromatic hydrocarbons (PAHs) from water samples prior their determination using gas chromatography–mass spectrometry, in which effect hydrophilic deep eutectic solvent (DES) used as dispersant investigated. The main extraction parameters were optimized, and procedure validated. DES2 synthesized choline chloride with acetic acid at molar ratio 1:2 selected dispersant. Under optimum conditions, 12 mL sample injected into mixed containing 60 μL 1-dodecanol (extractant) 316 DES2, ultrasound-mixed for 4 min, then centrifuged 5 min separate phases. showed good linearity range 0.02–5.0 μg/L; limits detection 3.5–14.1 ng/L, quantification 11.8–46.9 relative standard deviations below 6.1%, enrichment factors ranged 142 175 PAHs. Finally, successfully employed determine PAHs real samples.