An aliquot of the diluted sample (50 μL) was placed in a 200 μL glass microvial and then transferred to the TDU by means of the MPS2. The TDU was firstly operated in the solvent vent mode, in order to evaporate the sample solvent, with a temperature of 40 °C which was maintained for 2 min, while a helium gas-flow of 125 mL min−1 at 9 psi flowed through the GC inlet during this solvent drying step. Next, the TDU was set to splitless mode and heated to 300 °C with a ramp temperature of 260 °C min−1 with a 2 min holding time, in order to evaporate the analytes, which were retained in a 1 mm fibreglass packed liner in the PTV-CIS 4. During the evaporation of the analytes, the PTV-CIS was maintained at 20 °C, and then ramped at a rate of 10 °C s−1 to a final temperature of 275 °C with a 5 min holding time.