Humification
of
exogenous
soil
organic
matter
(ESOM)
remodels
the
compositions
and
microbial
communities
soil,
thus
exerting
potential
impacts
on
biogeochemical
transformation
iron
(hydr)oxides
associated
trace
metals.
Here,
we
conducted
a
70-day
incubation
experiment
to
investigate
how
aerobic
straw
humification
influenced
repartitioning
arsenic
(As)
with
ferrihydrite
in
paddy
soil.
Results
showed
that
was
characterized
by
rapid
OM
degradation
(1-14
days)
subsequent
slow
maturation
(14-70
days).
During
stage,
considerable
As
(13.1
mg·L-1)
released
into
aqueous
phase,
which
reimmobilized
solid
phase
stage.
Meanwhile,
low-crystalline
structural
As/Fe
converted
more
stable
species,
subtle
crystalline
transformation.
The
generated
highly
unsaturated
phenolic
compounds
enriched
Enterobacter
Sphingomonas
induced
(∼3.1%)
As(V)
reduction,
leading
release
during
In
carboxylic-rich
alicyclic
molecules
facilitated
reimmobilization.
Throughout
process,
organo-mineral
complexes
formed
between
via
C-O-Fe
bond
contributed
solid-phase
stabilization.
Collectively,
this
work
highlighted
ESOM
humification-driven
(hydr)oxide
redistribution,
advancing
our
understanding
coupled
behaviors
C,
Fe,
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(31), P. 11357 - 11372
Published: July 26, 2023
Biochar,
a
carbon
(C)-rich
material
obtained
from
the
thermochemical
conversion
of
biomass
under
oxygen-limited
environments,
has
been
proposed
as
one
most
promising
materials
for
C
sequestration
and
climate
mitigation
in
soil.
The
contribution
biochar
hinges
not
only
on
its
fused
aromatic
structure
but
also
abiotic
biotic
reactions
with
soil
components
across
entire
life
cycle
environment.
For
instance,
minerals
microorganisms
can
deeply
participate
mineralization
or
complexation
labile
(soluble
easily
decomposable)
even
recalcitrant
fractions
biochar,
thereby
profoundly
affecting
cycling
Here
we
identify
five
key
issues
closely
related
to
application
review
outstanding
advances.
Specifically,
terms
use
pyrochar,
hydrochar,
stability
soil,
effect
flux
speciation
changes
emission
nitrogen-containing
greenhouse
gases
induced
by
production
application,
barriers
are
expounded.
By
elaborating
these
critical
issues,
discuss
challenges
knowledge
gaps
that
hinder
our
understanding
provide
outlooks
future
research
directions.
We
suggest
combining
mechanistic
biochar-to-soil
interactions
long-term
field
studies,
while
considering
influence
multiple
factors
processes,
is
essential
bridge
gaps.
Further,
standards
should
be
widely
implemented,
threshold
values
urgently
developed.
Also
needed
comprehensive
prospective
assessments
restricted
account
contributions
contamination
remediation,
quality
improvement,
vegetation
accurately
reflect
total
benefits
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(7), P. 2981 - 2991
Published: Feb. 7, 2023
The
interactions
between
dissolved
organic
matter
(DOM)
and
iron
(Fe)
oxyhydroxide
are
crucial
in
regulating
the
biogeochemical
cycling
of
nutrients
elements,
including
preservation
carbon
soils.
mechanisms
DOM
molecular
assembly
on
mineral
surfaces
have
been
extensively
studied
at
mesoscale
with
equilibrium
experiments,
yet
molecular-level
evolution
DOM-mineral
interface
under
dynamic
interaction
conditions
is
not
fully
understood.
Here,
we
designed
a
microfluidic
reactor
coupled
an
online
solid
phase
extraction
(SPE)-LC-QTOF
MS
system
to
continually
monitor
changes
composition
during
flowing
contact
Fe
circumneutral
pH,
which
simulates
soil
minerals
interacting
constant
input.
Time-series
UV-visible
absorption
spectra
mass
spectrometry
data
showed
that
after
aromatic
moieties
were
first
preferentially
sequestered
by
pristine
surface,
adsorption
nonaromatic
molecules
greater
hydrophobicity,
lower
acidity,
weights
(<400)
from
new
solutions
was
favored.
This
accompanied
transition
surface
chemistry-dominated
organic-organic
interaction-dominated
adsorption.
These
findings
provide
direct
evidence
zonal
model
taking
dynamics
interfacial
into
consideration.
study
also
shows
microfluidics
high-resolution
(HRMS)
promising
experimental
platform
for
probing
microscale
environmental
integrating
situ
reactions,
sample
pretreatment,
automatic
analysis.
npj Materials Sustainability,
Journal Year:
2023,
Volume and Issue:
1(1)
Published: Nov. 27, 2023
Abstract
Reactive
primary
and
secondary
minerals
play
a
critical
role
in
the
transformation
stabilization
of
organic
matter
(OM)
soil,
aspect
that
has
been
largely
overlooked
existing
literature.
In
this
regard,
we
propose
new
model
known
as
“reactive
mineral
sink”
(RMS)
to
illustrate
three
mechanisms
through
which
these
drive
bioprocessing,
transformation,
transport
OM
soil.
Firstly,
from
biological
perspective,
reactive
influence
enzymatic
microbial
processing
binding
proteins
or
influencing
structure
communities.
Secondly,
chemical
standpoint,
have
capacity
adsorb
and/or
coprecipitate
with
it,
leading
more
diverse
distribution
This
distribution,
turn,
triggers
catalysis
redox
reactions.
Thirdly,
on
physical
level,
substantial
impact
soil
architecture,
aggregate
dynamics,
porosity
development,
hydrological
processes.
These
changes
then
affect
transport,
reprocessing
OM.
The
RMS
provides
conceptual
framework
underscores
fundamental
driving
dynamics
carbon
(C)
sequestration
natural
Furthermore,
it
promotes
restoration
biogeochemical
processes
ecological
resilience.
We
advocate
for
implementation
strategies
based
enhance
C
soils
purposes
rejuvenating
health
mitigating
CO
2
emission.
Eco-Environment & Health,
Journal Year:
2024,
Volume and Issue:
3(2), P. 227 - 237
Published: March 21, 2024
Soil
metabolomics
is
an
emerging
approach
for
profiling
diverse
small
molecule
metabolites,
i.e.,
metabolomes,
in
the
soil.
including
fatty
acids,
amino
lipids,
organic
sugars,
and
volatile
compounds,
often
contain
essential
nutrients
such
as
nitrogen,
phosphorus,
sulfur
are
directly
linked
to
soil
biogeochemical
cycles
driven
by
microorganisms.
This
paper
presents
overview
of
methods
analyzing
metabolites
state-of-the-art
relation
nutrient
cycling.
We
describe
important
applications
studying
carbon
cycling
sequestration,
response
pools
changing
environmental
conditions.
includes
using
provide
new
insights
into
close
relationships
between
microbiome
metabolome,
well
responses
metabolome
plant
stresses
contamination.
also
highlight
advantage
study
elements
suggest
that
future
research
needs
better
understand
factors
driving
function
health.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(37), P. 13991 - 14001
Published: July 31, 2023
Coprecipitation
of
Fe/Cr
hydroxides
with
natural
organic
matter
(NOM)
is
an
important
pathway
for
Cr
immobilization.
However,
the
role
NOM
in
coprecipitation
still
controversial
due
to
its
molecular
heterogeneity
and
diversity.
This
study
focused
on
selectivity
toward
coprecipitates
uncover
fate
via
Fourier
transform-ion
cyclotron
resonance-mass
spectrometry
(FT-ICR-MS).
The
results
showed
that
significant
effects
Suwannee
River
(SRNOM)
immobilization
stability
did
not
merely
depend
adsorption
SRNOM
hydroxides.
FT-ICR-MS
spectra
suggested
two
pathways
affected
Polycyclic
aromatics
polyphenolic
compounds
preferentially
adsorbed
hydroxide
nanoparticles,
which
provided
extra
binding
sites
promoted
aggregation.
Notably,
some
specific
(i.e.,
highly
unsaturated
phenolic
compounds),
less
more
oxygenated
than
those
were
incorporated
into
insoluble
Cr-organic
complexes
coprecipitates.
Kendrick
mass
defect
analysis
revealed
contained
fewer
carbonylated
homologous
compounds.
More
importantly,
spatial
distribution
was
strongly
related
Fe/Cr-NOM
information
would
be
beneficial
a
better
understanding
transport
exploration
remediation
strategy.
