Traditional sample-preparation tech- niques are frequently used, even today. However, several microextraction tech- niques have gained their place in modern analytical laboratories. The first was solid-phase microextraction (SPME), intro- duced by Arthur and Pawliszyn [1]. Since then, several other microextraction tech- niques have been developed and the two most popular are single-drop microex- traction (SDME) [2,3] and hollow-fiber liquid-phase microextraction (HF-LPME) [4]. Nevertheless, all these extraction techniques have both advantages and disadvantages. The latter have led to further development of sample pre- treatment techniques. The invention and the development of dispersive liquid-liquid microextraction (DLLME) in 2006 is the latest example [5,6].