TA I
NSTRUMENTS
TGA 2950
B–65
Hi-Res
TM
Option
Stepwise
Isothermal Scans
In Figures B.16 and B.17 we see the result of
stepwise isothermal scans of the bicarbonate
mixture using a conventional 1
°
C/minute ramp
and the abort segment. The following method
was used for the scan in Figure B.16:
1: Abort next seg if %/min > 0.15
2: Ramp 1
°
C/min to 300
°
C
3: Abort next seg if %/min < 0.015
4: Isothermal for 500 minutes
5: Repeat segment 1 til 300
°
C
Although this method gives apparently excellent
separation results, the quantitative value of the
weight loss plateau between the two bicarbonate
decompositions is in question because there is
no inflection point in the plateau and the rate of
weight loss immediately increases after the
isothermal segment is aborted. This indicates
that the two decompositions are still overlapped
and that holding for a longer isothermal time
period during the first transition would have
resulted in a lower weight loss plateau between
transitions.
In Figure B.17 the same stepwise isothermal
method is repeated with the %/minute limits for
the abort segments set to smaller values (0.05%/
minute for the ramp abort and 0.005%/minute
for the isothermal abort). The following method
was used for the scan in Figure B.17:
1: Abort next seg if %/min > 0.05
2: Ramp 1
°
C/min to 300
°
C
3: Abort next seg if %/min < 0.005
4: Isothermal for 500 minutes
5: Repeat segment 1 til 300
°
C
Summary of Contents for TGA 2950
Page 20: ...TA INSTRUMENTS TGA 2950 xx ...
Page 22: ...Introducing the TGA 2950 TA INSTRUMENTS TGA 2950 1 2 ...
Page 36: ...TA INSTRUMENTS TGA 2950 Installing the 2950 2 2 ...
Page 90: ...Running Experiments TA INSTRUMENTS TGA 2950 3 24 ...
Page 92: ...Technical Reference TA INSTRUMENTS TGA 2950 4 2 ...
Page 112: ...Technical Reference TA INSTRUMENTS TGA 2950 4 22 ...
Page 136: ...TA INSTRUMENTS TGA 2950 Maintenance and Diagnostics 5 24 ...
Page 142: ...Appendix B B 4 TA INSTRUMENTS TGA 2950 ...
Page 152: ...Appendix B B 14 TA INSTRUMENTS TGA 2950 Figure B 2 Figure B 3 ...
Page 153: ...TA INSTRUMENTS TGA 2950 B 15 Hi ResTM Option Figure B 4 Figure B 5 ...
Page 169: ...TA INSTRUMENTS TGA 2950 B 31 Hi ResTM Option Figure B 7 Figure B 8 ...
Page 188: ...Appendix B B 50 TA INSTRUMENTS TGA 2950 Figure B 11 Sensitivity Setting Too High ...
Page 205: ...TA INSTRUMENTS TGA 2950 B 67 Hi ResTM Option Figure B 16 Figure B 17 ...
Page 211: ...TA INSTRUMENTS TGA 2950 B 73 Hi ResTM Option Figure B 22 Figure B 23 ...
Page 212: ...Appendix B B 74 TA INSTRUMENTS TGA 2950 Figure B 24 Figure B 25 ...
Page 214: ...Appendix B B 76 TA INSTRUMENTS TGA 2950 ...
Page 216: ...Appendix C TA INSTRUMENTS TGA 2950 C 2 ...
Page 218: ...Appendix C TA INSTRUMENTS TGA 2950 C 4 Figure C 1 Auto TGA ...
Page 236: ...Appendix D TA INSTRUMENTS TGA 2950 D 2 ...
Page 258: ...Appendix D TA INSTRUMENTS TGA 2950 D 24 ...
Page 264: ...Index TAINSTRUMENTSTGA2950 I 6 ...
