thus allowing the target analytes
to be converted into their trimethylsilyl derivatives to optimize the GC–MS analysis. No centrifugation
and disperser solvent were required in this microextraction procedure. Significantly, short extraction
time and high extraction efficiency were achieved. This method opens up a potentially new horizon for
on-site dispersive liquid–liquid microextraction. Under the optimum conditions, the proposed method
provided good enrichment factors up to 310, with relative standard deviations ranging from 6.1 to 12.9%.
The limits of quantification were in the range of 20–100 ng/L, depending on the analytes. The linearities
were between 0.05 and 10 g/L and 0.1 and 10 g/L for different UV filters. Finally, the proposed
method was successfully applied to the determination of UV filters from spiked genuine water samples
and acceptable recoveries over the range of 71.0–120.0% were obtained.