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Detector Systems
Electron capture detector (ECD)
137
Anode Purge
Vent
Makeup Gas Adapter
Electron Capture Detector (ECD)
Figure 7-5
Nickel Plating
Fused Silica Liner
Makeup Gas
Column
Plated
63
Ni Surface
Anode
The electron capture detector (ECD) cell contains Ni, a radioactive
isotope emitting high•energyelectrons (
•particles).These undergo
repeated collisions with carrier gas molecules, producing about 100
secondary electrons for each initial
•particle.
Further collisions reduce energy of these electrons into the thermal
range. These low energy electrons are then captured by suitable sample
molecules, thus reducing total electron population within the cell.