Answered: Figure 7 of Conrad et al. (1999) shows…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Figure 7 of Conrad et al. (1999) shows the variation in C-isotopic composition of CO2 as a function of the concentration of methane measured in the soil and aquifers of a site contaminated in the residues of aviation fuels.

Explain briefly the aim of these particular measurements made to the environmental study.

Also explain briefly why there is a difference in isotopic composition of CO2 obtained via aerobic degradation and methanogenic degradation of AVGAS (fuel residues as contaminants) and the linear “mixing relationship” noted in Figure 7.

How does the degradation process influence the CO2 isotopic signature ? I don't understand why the CO2 from aerobic degradation is lighter than the one from methnogenic degradation ?

% CH₂
35
30
25-
20
15
10
5
0
aerobic
degradation of
AVGAS
-30
-20
methane oxidation
-15
-10
Sampling
Locations
2
A5
10
11
methanogenic
degradation
of AVGAS
-5
A 12
□20
0 21
0
81³C (%) of CO₂
Fig. 7. Plot of % CH4 vs the 8¹³C values of CO₂ by sample location for all samples containing CH4 from the study site. The dashed
line is a best fit line through the data. Also shown are the approximate fields that would be expected for methanogenic and aerobic
degradation of AVGAS, and the trend that would be expected for significant levels of methane oxidation.

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