Comparison of GC/time-of-flight MS with GC/quadrupole MS for halocarbon trace gas analysis

摘要: Abstract. We present the application of time-of-flight mass spectrometry (TOF MS) for analysis halocarbons in atmosphere after cryogenic sample preconcentration and gas chromatographic separation. For described field application, quadrupole spectrometer (QP is a state-of-the-art detector. This work aims at comparing two commercially available instruments, QP MS TOF MS, with respect to resolution, accuracy, stability axis instrument sensitivity, detector measurement precision linearity. Both spectrometers are operated on same system by splitting column effluent both detectors. The had be optimised single ion monitoring (SIM) mode achieve sensitivity which could compete MS. provided full range information any acquired spectrum without losing sensitivity. Whilst showed performance already achieved earlier tests, was average higher than that "operational" SIM factor up 3, reaching detection limits less 0.2 pg. Measurement determined whole analytical 0.2% depending substance sampled volume. used this study displayed significant non-linearities 10% two-thirds all analysed substances.