Frontier EGA/PY-3030D - 5.4 HEART-CUT EGA ANALYSIS

Ver.1.36
5-7
5.4 HEART-CUT EGA ANALYSIS
This is a technique in which gases eluted from any temperature zone of the EGA thermogram is
selectively introduced to the separation column for analysis (GC/MS). This analysis requires a
Selective Sampler (optional). Also for analysis of low boiling evolved gases with C
15
or less requires a
cryo trap. Frontier Laboratories MicroJet Cryo-Trap is highly recommended. The setup for a typical
Heart-Cut EGA analysis is shown in Fig. 5.9. By using the Selective Sampler and MicroJet Cryo-Trap,
a maximum of eight temperature zones can be automatically analyzed by GC/MS.
Here, ceramic composite material is analyzed. Based on its EGA thermogram (Fig.5.10), four
temperature zones are determined and the evolved gases from each temperature zone are analyzed
by GC/MS.
10 20 min
40 200 400 ºC600100 300 500
A B C
D
ZONE
0 2815.58 1810 20 min
40 200 400 ºC600100 300 500
A B C
D
ZONE
0 2815.58 18
Fig. 5.10 EGA thermogram of a ceramic composite
MS
Temperature controller
Carrier gas: He
Multi-Shot Pyrolyzer
Separation column
Split/splitless injection port
Selective Sampler
MicroJet cryo-Trap
Vent-free GC/MS Adapter
Fig. 5.9 Instrument setup for a typical Heart-Cut EGA analysis