MS detector parameters

The MS detector provides useful information about the chemical structure of compounds which is vital to their identification. When using a MS connected in tandem to a GC, ensure that:

  1. The transfer line is generally held at the same temperature as the injector and should be a section of column that extends between the GC oven and the MS detector..
  2. The ion source should also be held at a high temperature (220°C).
  3. Scan parameters define the m/z (mass/charge) range of fragmented ions scanned by the detector. This range needs to contain the ion fragments of the compounds of interest while avoiding major low mass background ions such as nitrogen gas. Use a m/z range of 35 to 40 minimum to 400 to 600 maximum.