Detectors 5
Advanced Operation Manual 185
uECD gas flows
uECD linearity
The uECD response factor versus concentration curve is
linear for four orders of magnitude or more (linear dynamic
range = 10
4
or higher) for a broad range of compounds. You
should still run a calibration curve on your samples to find
the limits of the linear range for your materials.
uECD detector gas
The uECD operates with either nitrogen or argon/methane as
the makeup and anode gas. Purity is critical; gases must
exceed 99.9995% purity.
Because of the high detector sensitivity, carrier and makeup
gas must be dry and oxygen- free. Moisture, chemical, and
oxygen
traps in good condition should be installed in carrier
and makeup gas supply lines. Do not use plastic (including
PTFE) tubing, plastic- bodied traps, or O- ring seals.
uECD temperature
To prevent peak tailing and to keep the cell clean, the
detector temperature should be set higher than the highest
oven temperature used—the setpoint should be based on the
PS = Pressure Sensor
PS
Valve
Frit
Restrictor
Restrictor
EPC Module
Anode purge and makeup gas
Vent
63
Ni
Column
Capillary adapter
To Next Page
Loading...
Need help?
General
