For this type of compound, the minimum detectable quantity (MDQ) is at the femtogram (
The PDD is similar in sensitivity and response characteristics to a conventional radioactive ECD, and can be operated at temperatures up to 400°C.
In the helium photoionization mode, the PDD is a universal, non-destructive, high sensitivity detector.
Response to fixed gases is positive (increase in standing current), with an MDQ in the low ppb range.
In addition, when the helium discharge gas is doped with a suitable noble gas, such as argon, krypton, or xenon (depending on the desired cutoff point), the PDD can function as a specific photoionization detector for selective determination of aliphatics, aromatics, amines, as well as other species.