6
Using EA IsoLink IRMS System for CNSOH
Dual Measurement
84
EA IsoLink IRMS System for CNSOH Operating Manual
Thermo Scientific
Dual Measurement
Analyses of
N
and
C
in dual or single mode have to be performed with a reactor, which traps
SO
2
.
The packing instructions for such a reactor are given in
Figure 84.
Reactor Setup NC
After installation of a new NC reactor heat up the furnace in the following stepwise manner:
room temperature > 900 °C > 1020 °C
. Upon reaching
900 °C
step, allow at least 15 minutes of
equilibration time before commencing the next heating step.
A stepwise heating up of the reactor avoids temperature overshooting, and hence melting of the
reduced copper contained in the reactor. Alternatively, use
HeatUpFlash
from the Context Menu with
a right-click on the Flash IRMS peripheral visualization. See
Figure 85.
HeatUpFlash
It is possible to perform dual measurements of hydrogen and oxygen as well as carbon and nitrogen
from a single sample with the system. This analysis mode is suitable for both solid and liquid samples.
If no S analysis is required, it is recommended to use a reactor setup that traps SO
2
. If S analysis is
required, it is recommended to use a triple analysis.
Procedure
For the analysis of two isotopic species (hydrogen and oxygen, or nitrogen and carbon) from a single
sample, an Isodat Method, which comprises both of them has to be defined.
