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- In situ
measurement of
methane
oxidation in
groundwater by
using
natural-gradie
nt tracer
tests.: Appl. Environ.
Microbiol.,
Vol. 57, No.
7. (1 July
1991), pp.
1997-2004.Meth
ane oxidation
was measured
in an
unconfined
sand and
gravel aquifer
(Cape Cod,
Mass.) by
using in situ
natural-gradie
nt tracer
tests at both
a pristine,
oxygenated
site and an
anoxic,
sewage-contami
nated site.
The tracer
sites were
equipped with
multilevel
sampling
devices to
create target
grids of
sampling
points; the
injectate was
prepared with
groundwater
from the
tracer site to
maintain the
same
geochemical
conditions.
Methane
oxidation was
calculated
from
breakthrough
curves of
methane
relative to
halide and
inert gas
(hexafluroetha
ne) tracers
and was
confirmed by
the appearance
of
13C-enriched
carbon dioxide
in experiments
in which
13C-enriched
methane was
used as the
tracer. A Vmax
for methane
oxidation
could be
calculated
when the
methane
concentration
was
sufficiently
high to result
in zero-order
kinetics
throughout the
entire
transport
interval.
Methane
breakthrough
curves could
be simulated
by modifying a
one-dimensiona
l
adevection-dis
persion
transport
model to
include a
Michaelis-Ment
en-based
consumption
term for
methane
oxidation. The
Km values for
methane
oxidation that
gave the best
match for the
breakthrough
curve peaks
were 6.0 and
9.0 microM for
the
uncontaminated
and
contaminated
sites,
respectively.
Natural-gradie
nt tracer
tests are a
promising
approach for
assessing
microbial
processes and
for testing in
situ
bioremediation
potential in
groundwater
systems.RL
Smith, BL
Howes, SP
Garabedian
Source: Appl. Environ. Microbiol., Vol. 57, No. 7. (1 July 1991), pp. 1997-2004.
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