PDECDPulsed Discharge Electron Capture Detector
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Detector Species Ionization Typical lower type analyzed method detectable limits TCD Universal n/a mid ppm FID Hydrocarbons Flame low ppm HID UniUversal Radioactive source ppb PDHID Universal Pulsed discharge low ppb ECD Electron affinity Radioactive source ppb to ppt PDECD Electron affinity Pulsed discharge ppb to ppt One of the oldest and most ubiquitous detectors for gas chromatography is the thermal conductivity detector (TCD).
Before the development of pulsed discharge electron capture detectors (PDECDs), these detectors also used radioactive sources.