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USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
Appendix G:
The GLA431-MCIA1 measures the concentration of
used to calculate the total CH
screens. The data file output includes the concentrations as well. The terms and their
respective data file name are listed below:
The isotope ratios are reported in ‰ relative to Vienna Pee Dee Belemnite. The
standard listed below were taken from IAEA-TECDOC-825.
Total CH
is defined as the sum of all the isotopes:
4
The isotope ratio is defined according to:
Where the measured ratio is calculated from the measured concentrations:
Isotope Definitions
and the isotope ratio that are reported on the display
4
CH
4
C
13
δ
[
12
C
1
H
]
4
13
1
[
C
H
]
4
(R
) VPDB
13
12
1
CH
[
C
H
] + [
=
4
4
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CH
and
CH
. These concentrations are
12
13
4
4
[CH4]__ppm
d13C
[12CH4]__ppm
[13CH4]__ppm
0.0112372
13
1
C
H
]
4
− 1 ×1000
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108
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