Abstract
UV –filters are applied to sunscreen, cosmetic and other personal care products to filter radiation from sunlight. The excessive use of UV filters has led to their presence in the environmental water. A user-friendly ionic liquid –based up and down shaker assisted dispersive liquid-liquid microextraction was develpoed to preconcentrate trace amounts of UV-filters (i.e., benzophenone, 2-Hydroxy-4-methoxybenzophenone, 2,2'-Dihydroxy-4-methoxybenzophenone) from real water sample prior to analysis by ultra performance liquid chromatography (UPLC) combined with PDA . This studied variables were extractant, dispersant, shaking time, salt effect, pH effect, centrifugation time. The optimized experimental conditions were 40 μL [C8MIM][PF6], 200 μL methanol, up and down shaking for 3 mins, NaCl free, adjusted to pH 7, 5000 rpm agitation speed for 3mins. The detection limits of the method ranged from 2~1000 ng mL-1 and the R2 ≥ 0.9993. Recovery studied from different types of real water samples ranged between 92 and 120%.