Figure 7 of Conrad et al. (1999) shows the variation in C-isotopic composition ofCO2 as a function of the concentration of methane measured in the soil andaquifers of a site contaminated in the residues of aviation fuels. Explain brieflythe aim of these particular measurements made to the environmental study. Alsoexplain briefly why there is a difference in isotopic composition of CO2 obtainedvia aerobic degradation and methanogenic degradation of AVGAS (fuel residuesas contaminants) and the linear "mixing relationship" noted in Figure 7.3530methane oxidationmethanogenicdegradationof AVGAS25 -2015SamplingLocations10aerobiedegradation ofAVGASA 12• 1356.14O 20O 219O 10-30-25-20-15-10-58®C (%c) of CO,Fig. 7. Plot of %CH4 vs the 8'³C values of CO2 by sample location for all samples containing CH4 from the study site. The dashedline is a best fit line through the data. Also shown are the approximate fields that would be expected for methanogenic and aerobicdegradation of AVGAS, and the trend that would be expected for significant levels of methane oxidation.% CH,

The objective of this question os to show the presented the variation of the isotopic composition of…

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. CH₂ 35 30- 25 20 methane oxidation methanogenic degradation of AVGAS

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. CH₂ 35 30- 25 20 methane oxidation methanogenic degradation of AVGAS

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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Question

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.
35
30
methane oxidation
methanogenic
degradation
of AVGAS
25 -
20
15
Sampling
Locations
10
aerobie
degradation of
AVGAS
A 12
• 13
5
6.
14
O 20
O 21
9
O 10
-30
-25
-20
-15
-10
-5
8®C (%c) of CO,
Fig. 7. Plot of %CH4 vs the 8'³C 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.
% CH,

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