Creating An Ea Method For N+C Measurement - Thermo Scientific EA IsoLink IRMS System Operating Manual

6
Using EA IsoLink IRMS System for CNSOH

Creating an EA Method for N+C Measurement

Creating an EA Method for N+C Measurement
The following figures
be set up.
Figure 97. NC EA Method: Instrument Temperature
Note The temperature of the high-temperature conversion furnace (left furnace) may be different
depending on the intended use of it.
Figure 98. NC EA Method: Instrument Flow-Timing
Note Sampling delay and oxygen injection end vary depending on the sample nature. O
can be crucial in a single reactor if it exceeds the required amount.
The reference flow is used for the autosampler purge. This flow can be set to values between
20 mL/min and 70 mL/min (150 - 200 mL/min in total when using He
minimize or eliminate the blank contribution of the autosampler.
For single mode N analyses, a second trap can be installed filled with Carbosorb® or Ascarite® to
remove CO
can be deleted in the Time Event List of the Isodat Method.
92 EA IsoLink IRMS System for CNSOH Operating Manual
(Figure 97 to Figure
. The analysis time has to be reduced even further. In this case the entry Switch Gas CO
2
101) show how an EA-method for a dual analysis N+C may
injection
2
M
), with the goal to
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2