Habibollah ESKANDARI, Mahnaz SHAHBAZI-RAZ

Ionic liquid based microextraction combined with derivatization for efficientenrichment/determination of asulam and sul de

This study reports 2 new simple derivatization-based dispersive liquid{liquid microextraction (DLLME)methods for spectrophotometric ultratrace determination of asulam and sul de. 1-Naphthol (in the presence of nitrite)and N,N-diethyl-p-phenylenediamine (in the presence of Fe(III)) were used to derivatize asulam and sul de, respectively.In the enrichment methods, the formed derivatives were preconcentrated into microdroplets of the in situ formed waterinsoluble ionic liquid (IL), 1-hexyl-3-methylimidazolium hexa uorophosphate. Monitoring was performed at 526 nm forasulam and at 664 nm for sul de, after dissolution of the IL-rich phases into the basic ethanolic solution and ethanolfor asulam and sul de, respectively. Beer's law was obeyed in the ranges of 1.0{80.0 and 0.1{5.0 ng mL1for asulamand sul de, respectively. Limits of detection for asulam and sul de determination by the DLLME methods were 0.18and 0.019 ng mL1, respectively. Various foreign cations, anions, organics, and pesticides were tested to evaluate theselectivity of the DLLME methods. The methods were successfully applied to the determination of asulam and sul dein various environmental, wastewater, and urine samples.

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