Pure Samples or Simple Mixtures

products from chemical reactions, and compounds used to calibrate mass scales are usually introduced into the ion source directly. 

1 Introduction of Gases and Volatile Liquids Using Batch Inlets 

Batch inlets should enable a constant and reliable flow rate of the sample during the analysis, and be inert to the analytes. Gases and volatile liquids are introduced into El or Cl sources from a glass or metal reservoir of known volume (that can be heated to 350°C) by way of a gold or steel foil that has one (or several) pinhole(s) (0.005 to 0.02 mm diameter). The introduction of liquids can be controlled by placing the 

The most common use of batch inlets is to introduce a controlled flow of compounds for calibrating the mass scale. Frequently used calibration compounds include perfluorotributylamine (FC-43, heptacosa) and perfluorokerosene (PFK) both are effective with electron ionization (El) but give limited responses in chemical ionization (Cl). If used for calibration in Cl, or to provide lock masses (Section 3.1.1), the concentration of the reagent gas must be reduced. This reducation somewhat compromises the effectiveness of the Cl process. 

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