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Thermionic Ionization Detector mechanism

The nitrogen-phosphorus detector (NPD) is also called the alkali flame ionization detector (AFID), or thermionic NPD if no flame is used. The flame NPD is similar to the FID, but with an additional unit, usually a rubidium silicate bead, which is heated by an electrical current (Figure 2.9). When a compound enters the detection compartment, the ion current for compounds containing N or P increases. The mechanism for N detection may briefly described by the following ... [Pg.30]

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