IST16 User manual
–
Version 8.0
SRA
INSTRUMENTS
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p. 56 / 59
such a way its temperature dependent evolution profile is established. This is illustrated in figure 3. The
TGA curve is shown in black (right axis) and
m/z
44 is shown in red (left axis).
Figure 3
: TGA curve and
m/z
44 evolution profile
16.4
Conclusion
Calcium carbonate (CaCO
3
) can be used as a standard for the TGA-IST16-GC/MS system proof of concept for
on-site verification. CaCO
3
decomposes to CaO and CO
2
. The mass loss measured by the TGA should be 44 %
according to the stoichiometry of the calcium carbonate calcination (CaCO
3
→
CaO + CO
2
). As only CO
2
is
evolved, there are no risks of contamination and the GC acquisition method is only 7.5 minutes. As it can be
observed in figure 3, CO
2
is still detected even the decomposition process is finished. This can be resolved
by either using a lower sample mass such as e.g. 5 mg, a bigger reactive gas flow such as e.g. 50 or 70
mL/min or a bigger split ratio such as e.g. 10:1 or 20:1. The same test should be repeated using other
columns delivered with the GC/MS system during installation.
Disclaimer
This report presents one or more examples of analysis. The experiments were conducted with the utmost care using the instruments
specified in the description of each application. The results have been evaluated according to the current state of our knowledge.
This does not however absolve you from personally testing the suitability of the examples for your own methods, instruments and
purposes. Since the transfer and use of an application is beyond our control, we cannot of course accept any responsibility.
50
60
70
80
90
100
110
-2
0
2
4
6
8
10
12
14
500
600
700
800
900
1000
W
e
ight
in %
Res
ponse
in
a
.u.
x
1
0
0
0
0
0
0
0
Temperature in
°C
CO2
TGA
