H3-Factor Determination - Thermo Scientific EA IsoLink IRMS System Operating Manual

• The chromatogram and result grid are shown in
Figure 121. Dual Measurement Chromatogram
The H
Figure 122
Figure 122. Dual Measurement H
The CO page displays information about the CO-related peaks. See Peaks Nr. 4, 5 and 6 in
Figure
Figure 123. Dual Measurement CO Result Grid

H3-Factor Determination

Protonation reactions in the ion source result in H3+-ion production. The H3+ portion of the m/z ion
beam is determined as the H3-factor. The H3-factor is used to correct the H3+ contribution to the
m/z3 signal. A low and stable H3-factor is needed for a good DH/H2 determination.
H3-factor determination is based on the peak area information of a "standard gas on/off
chromatogram" (*.dxf ) with standard gas pulses of different amplitudes. How to perform a H3-Factor
Determination is explained in Chapter 3 of the ConFlo IV Operating Manual.
Thermo Scientific
page displays information about the hydrogen-related peaks, see Peaks Nr. 1, 2 and 3 in
2
123.
Figure 121,
Result Grid
2
EA IsoLink IRMS System for CNSOH Operating Manual
6
Using EA IsoLink IRMS System for CNSOH
H3-Factor Determination
Figure 122 and Figure 123:
107