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On the other hand, PDMS is swollen by many organic solvents like oils, but remains unaffected by water, nitromethane, ethylene glycol, acetonitrile, perfluorotributylamine, perfluorodecalin and propylene carbonate.
The mass spectrometer was calibrated with perfluorotributylamine at an electron impact ionization energy of 70 eV.
The ITMS was operated in electron ionization-positive mode and optimized with perfluorotributylamine (FC-34) using automatic gain control.
The mass spectrometer detector was tuned to optimum sensitivity for m/z 264, 288, and 314 of the perfluorotributylamine certified standard and programmed to monitor the m/z 289 main fragments for SF and AF, as well as the m/z 140 and 268 characteristic fragments of SF and AF, respectively (dwell time, 100 ms).
The mass spectrometer was calibrated with perfluorotributylamine through the "Standard Autotune" program of the "Chem Station" software (HewlettPackard).