The needle hangs a drop of the solvent while the sample is stirred. After extraction, the drop is aspirated back into the microsyringe and then injected into a gas chromatograph (GC) or liquid chromatograph (LC) [7], [21], [25], [28], [29] and [30]. The SDME procedure has the advantage of combining both a pre-concentration and sample introduction steps into a single-step extraction [31] which can widely be used in the determination of organic [32] and [33] and inorganic analytes [34], [35] and [36].