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Abstract
Focused ultrasonic-assisted extraction (FUSE) is a new and particular technique based
on the cavitation effect. In this work, the focused ultrasound assisted extraction
was studied and developed for the extraction of polycyclic aromatic hydrocarbons from
marine sediments and mussel tissues. The variables influencing the extraction (amplitude
of the ultrasound pulse, the extraction time and the solvent) were studied by a full
factorial design and a central composite design. As a result, flat response surfaces
were obtained and the most convenient conditions were 45% of ultrasound amplitude,
120s of extraction time and 5 mL of acetone. Both accuracy and precision of the method
were evaluated by means of two certified reference materials (marine sediment and
mussel tissue) and the results were also compared to those obtained by microwave assisted
extraction.