Page 360 - Tandem Techniques
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Page 344
independence of the interface to the nature of the solvents used for the mobile phase
Figure 9.11
The Total Ion Current Chromatogram of a Sample
of Mother Liquor from a Vitamin A Acetate Crystallization
It is also seen that the system is entirely independent of the solvent used in the separation, which ranged
in polarity from the very dispersive n-paraffins to highly polar aliphatic alcohols and included
chlorinated hydrocarbons, nitroparaffins, esters and ketones.
The Belt Transport Detector
The wire transport interface was modified by McFadden et al. [7], who replaced the wire with a
continuous belt made either from stainless steel ribbon or a high-temperature plastic band. The belt
could be thermally cleaned after passing through the ion source, and prior to re-entering the coating
block. In a similar manner to the wire transport interface, the belt is actuated by a motor-driven pulley
with manual speed control. A diagram of the McFadden belt interface is shown in Figure 9.12.
The column eluent is taken up as a thin liquid film on the surface of a stainless steel or high-temperature
plastic ribbon (about 3.2 mm wide and
