A Thermo Scientific ™ TRACE 1310 Gas Chromatograph (GC) was coupled to the ISQ 7000 system equipped with the Thermo Scientific ™ NeverVent Vacuum probe interlock (VPI) and a Thermo Scientific ™ ExtractaBrite ion source. An Rtx® VMS column (20 m, 0.18 mm, 1 µm film) from Restek, which is equivalent to the Thermo