Abstract
Naturally
occurring
abiotic
dechlorination
reactions
in
clayey
soils
can
serve
as
an
important
attenuation
mechanism
for
groundwaters
impacted
by
chlorinated
solvents
such
trichloroethene
(TCE).
Potential
include
both
reductive
(anoxic)
and
oxidative
(oxic)
that
are
facilitated
ferrous
minerals.
However,
tools
to
provide
lines
of
evidence
reactions,
ultimately
screening‐level
estimates
rate
constants
be
incorporated
into
site
fate
transport
models,
yet
widely
accepted
these
systems.
Herein,
coupled
bench‐
field‐scale
testing
at
nine
locations
within
the
saturated
zone
showed
measurement
reduced
gases
field‐collected
samples
was
inconclusive
indicating
situ
dechlorination.
use
1%
(v/v)
HCl
extractions
X‐ray
diffraction
(XRD)
mineral
composition
provided
information
needed
estimate
TCE
clays,
thereby
serving
a
potential
screening
tool
investigation.
While
corresponding
estimating
clay
not
demonstrated,
hydroxyl
radical
generation
measured
each
batch
experiments
correlated
hydrogen
peroxide
concentrations
groundwater
near
sand‐clay
interface.
Thus,
this
observation
provides
(to
our
knowledge)
first
line
ongoing
reactive
oxygen
species
is
sand–clay
(oxic–anoxic)
interface,
potentially
means
facilitate
mitigate
back‐diffusion
from
clay.
