GC-8A Series
Gas Chromatograph
6
Electron Capture Detector (GC-8AIE)
Linear ECD with high sensitivity and wide dynamic range
The constant-current ECD maintains a constant current flow in
the detector. It offers excellent performance of a linear dynamic
range of 10,000 and 0.2 pg (Υ-BHC) minimum limit of detection,
and greatly restricts peak abnormalities such as negative peaks.
Flame Photometric Detector (GC-8APFp)
Flame
The FPD cell is designed so that the flame will not be
extinguished by a solvent overload.
FID monitor electrode
The FID monitor electrode in the detector permits extraction of
the FID signal.
*Requires the FID monitor kit (Special Accessory: P/N 221-23950-91)
Forced cooling system
To ensure a low noise level and long service life, the
photomultiplier tube is kept cool by a blower when the
detector is maintained at a high temperature.
Complete safety
The photomultiplier tube is protected against damage from
exposure to high light levels by a sensing circuit which cuts
power to the tube if anomalous conditions are detected.
Switchable detector current
The standing current flowing in the detector can be switched in
three stages for convenient analysis of samples across a wide
concentration range.
Comprehensive contamination countermeasures
The system features a programmed heating system to prevent
detector contamination (column oven heating starts only after
the detector reaches the set temperature) and a purge system
to maintain carrier gas purging and keep the detector in
standby status even when the detector is not being used for
analysis.
Purge flow line reduces stabilization time
The purge flow line allows purging of the interior of the
detector by carrier gas when the detector remains mounted in
the gas chromatograph but is not used.
This prevents oxidation by oxygen in the air and ensures stable
operation the next time the detector is used.
Fig. 10 ECD Cell
Fig. 11 Chromatogram of Trihalomethane
Fig. 12 FPD Cell
Chloroform 7.5ppb
Dichlorobromomethane
6.4ppb
Chlorodibromomethane
2ppb
1,1,1-
trichloroethane
Chloroform
Tetrachloromethane
Trichloroethylene
1,1,2-trichloroethane
Tetrachloroethylene
1,1,1,2-
tetrachloroethane
1,1,2,2-
tetrachloroethane
Carrier gas
Column
Purge gas
63
Ni source
Electrode
Exhaust
Quartz cylinder
Nozzle
Quartz tube
H
2
Electrode for FID monitor (option)
Cooling fan
Photomultiplier
Interference filter
Quartz window
Air
Column
Carrier gas
Thiophene
(2ng)
Methyl parathion (20ng)
Ethyl parathion (20ng)
EPN (20ng)
FID monitor
FPD
Fig. 13 Analysis of Trace Thiophene
in Benzene (S mode)
Fig. 14 Analysis of Organophosphorus
Pesticides (P-mode)
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