Environmental Science Processes & Impacts,
Год журнала:
2024,
Номер
26(12), С. 2297 - 2308
Опубликована: Янв. 1, 2024
Compost-derived
dissolved
organic
matter
(DOMC)
is
a
heterogeneous
assemblage
of
different
redox-active
molecules.
We
hypothesize
that
DOMC
can
interact
with
Cr(VI)
and
reduce
it
to
Cr(III),
thereby
influencing
the
dynamics
in
soil
aquatic
environments.
Here,
DOMC,
along
humic
substances
isolated
from
red
black
soil,
were
fractionated
into
acid
fractions
(i.e.,
HAC,
HAB,
HAR)
fulvic
FAC,
FAB,
FAR),
respectively.
The
reduction
interaction
between
six
investigated.
results
showed
total
capacity
(TRC)
was
26.77-49.34
μM
per
mg
OM.
TRC
HA
35.54-49.34
OM,
which
exceeded
FA
(26.77-31.29
OM).
had
HA/FA
ratio
0.64,
higher
than
substance
(0.59)
(0.20).
sum
35.57
larger
(32.87
OM)
(33.01
positively
correlated
TOC,
TN,
phenol
C,
alkyl
aromatic
C
contents
negatively
E2/E3,
O-alkyl
carboxyl
contents.
at
pH
6
negligible,
whereas
32-67%
reduced
2.
capacities
(RC2,
RC2,
RC6)
2-6
(R2
>
0.71)
C.
Spectral
analysis
there
no
obvious
complexation
6,
thus
but
solution
could
affect
accessibility
molecules
influence
reduction.
Groundwater Monitoring & Remediation,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 4, 2025
Abstract
Our
research
program
characterizes
dissolved
organic
carbon
(DOC)
generated
in
association
with
in‐situ
hydrocarbon
biodegradation.
While
this
DOC
has
been
thought
to
consist
primarily
of
degradation
intermediates,
high‐resolution
mass
spectrometry
(HRMS)
analysis
samples
collected
from
the
USGS's
Bemidji
site
indicates
that
most
chemical
formulae
identified
impacted
wells
are
also
found
unimpacted
water
samples.
We
recently
proposed
consists
microbial
products
as
a
result
de
novo
synthesis
by
organisms
growing
on
supplied
oil
and
is
chemically
consistent
naturally
occurring
DOC.
In
note,
we
further
evaluated
our
HRMS
results
focusing
two
electrochemical
characteristics:
identification
potential
redox
pairs
distribution
average
oxidation
state
HRMS‐identified
formulae.
hypothesize
microbially
produced
acts
pool
compounds
continuum
states
serves
reversible
electron
buffer
ability
accept,
store,
donate
electrons
depending
conditions.
This
allows
disconnected
time
space
reduction
terminal
acceptors
(TEAs),
such
oxygen,
Fe
3+
,
or
sulfate.
Given
concentrations
may
be
high
relative
hydrocarbons
TEAs,
it
suggests
missing
link
understanding
balance
at
sites
undergoing
natural
attenuation.
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 21, 2025
Little
is
known
about
the
electron
shuttle
ability
of
dissolved
organic
matter
(DOM)
and
its
effects
on
arsenic
(As)
mobilization,
which
makes
underlying
mechanism
groundwater
As
enrichment
elusive.
In
this
study,
both
electrochemical
properties
molecular
compositions
DOM
in
high
were
quantified
Hetao
Basin,
China.
We
found
that,
along
flow
path,
average
electron-transferring
capacity
(ETC)
DOM,
including
capacities
electron-accepting
electron-donating,
continuously
increased
from
2.85
to
3.59
mmole-/gC
with
concentrations.
The
increasing
ETC
reflected
an
increase
DOM.
Furthermore,
was
mainly
attributed
recalcitrant
compounds
especially
CHOS
CHONS
formulas
highly
unsaturated
structures
oxygen
(HUSHO)
CHO
CHON
aromatic
(AS).
significantly
positive
correlation
between
concentration
indicated
that
promoted
through
shuttling
for
inducing
reductive
dissolution
As-containing
Fe(III)
oxide
minerals,
further
supported
by
our
culture
experiments
showing
goethite
more
reduced
[133
μM
Fe(II)]
presence
a
higher
(3.35
mmole-/gC)
as
than
[65.2
relatively
lower
(2.41
mmole-/gC).
Our
study
highlights
AS
have
ability,
promoting
groundwater.
