The extraction unit, which was described elsewhere [24], is
schematically presented in Fig. 1. It consists of a PTFE body which is
pierced by an iron wire to allow its magnetic stirring. The polymeric
body presents an internal chamber (internal volume of ca. 50L)
which is filled with the acceptor phase. The internal chamber is
protected by a polymeric membrane, avoiding potential losses of
the acceptor phase during extraction. Considering that the device
works under the three-phase mode, the membrane was impregnated
with octanol to form a supported liquid membrane