Toxics,
Journal Year:
2023,
Volume and Issue:
11(6), P. 483 - 483
Published: May 25, 2023
Pollution
of
the
Arctic
Ocean
by
potentially
toxic
elements
(PTEs)
is
a
current
environmental
problem.
Humic
acids
(HAs)
play
an
important
role
in
regulation
PTE
mobility
soil
and
water.
The
permafrost
thaw
releases
ancient
organic
matter
(OM)
with
specific
molecular
composition
into
watersheds.
This
could
affect
PTEs
region.
In
our
study,
we
isolated
HAs
from
two
types
deposits:
Yedoma
ice
complex,
which
contains
pristine
buried
OM,
alas
formed
course
multiple
thaw-refreezing
cycles
most
altered
OM.
We
also
used
peat
non-permafrost
region
as
recent
endmember
for
evolution
were
characterized
using
13C
NMR
elemental
analysis.
Adsorption
experiments
conducted
to
assess
affinity
binding
Cu2+
Ni2+.
It
was
found
that
enriched
aliphatic
N-containing
structures
compared
much
more
aromatic
oxidized
HAs.
adsorption
have
revealed
higher
both
ions
obtained
data
suggest
substantial
release
OM
deposits
due
rapid
might
increase
their
toxicity
because
lesser
"neutralization
potential".
Eco-Environment & Health,
Journal Year:
2024,
Volume and Issue:
3(1), P. 59 - 76
Published: Jan. 3, 2024
Soil,
the
largest
terrestrial
carbon
reservoir,
is
central
to
climate
change
and
relevant
feedback
environmental
health.
Minerals
are
essential
components
that
contribute
over
60%
of
soil
storage.
However,
how
interactions
between
minerals
organic
shape
transformation
stability
remains
poorly
understood.
Herein,
we
critically
review
primary
mechanisms,
including
sorption,
redox
reaction,
co-precipitation,
dissolution,
polymerization,
catalytic
reaction.
These
interactions,
highly
complex
with
combination
multiple
processes,
greatly
affect
through
following
processes:
(1)
formation
or
deconstruction
mineral-organic
association;
(2)
oxidative
minerals;
(3)
polymerization
(4)
varying
association
according
mineral
transformation.
Several
pieces
evidence
related
turnover
during
interaction
in
real
eco-environment
then
demonstrated.
We
also
highlight
current
research
gaps
outline
priorities,
which
may
map
future
directions
for
a
deeper
mechanisms-based
understanding
storage
capacity
considering
its
minerals.
Global Change Biology,
Journal Year:
2025,
Volume and Issue:
31(1)
Published: Jan. 1, 2025
Soil
microorganisms
transform
plant-derived
C
(carbon)
into
particulate
organic
(POC)
and
mineral-associated
(MAOC)
pools.
While
microbial
carbon
use
efficiency
(CUE)
is
widely
recognized
in
current
biogeochemical
models
as
a
key
predictor
of
soil
(SOC)
storage,
large-scale
empirical
evidence
limited.
In
this
study,
we
proposed
experimentally
tested
two
predictors
POC
MAOC
pool
formation:
necromass
(using
amino
sugars
proxy)
CUE
(by
18O-H2O
approach).
sampling
(0-10
10-20
cm
depth)
was
conducted
along
climatic
transect
900
km
on
the
Loess
Plateau,
including
cropland,
grassland,
shrubland,
forest
ecosystems,
to
ensure
homogeneous
parent
material.
We
found
highest
accumulation
occurred
zones
MAT
between
5°C
10°C
or
MAP
300
500
mm.
Microbial
more
positively
related
than
(p
<
0.05),
suggesting
that
residues
may
improve
strongly
compared
pool.
Random
linear
regression
analyses
showed
increased
with
fungal
C,
whereas
bacterial
drove
MAOC.
coupled
0.05)
but
decoupled
SOC
>
0.05).
The
have
faster
turnover
rate
due
lack
clay
protection,
which
lead
rapid
thus
their
decoupling
from
CUE.
sense,
driven
by
necromass,
explains
dynamics.
Our
findings
highlight
insufficiency
relying
solely
predict
bulk
storage.
Instead,
propose
should
be
used
together
explain
dynamics,
each
influencing
distinct
Permafrost
soils
store
∼50%
of
terrestrial
C,
with
Yedoma
permafrost
containing
∼25%
the
total
C.
is
undergoing
degradation
due
to
thawing,
potentially
hazardous
effects
on
landscape
stability
and
water
resources.
Complicating
ongoing
efforts
project
ultimate
fate
deep
C
poorly
constrained
role
redox
environment,
Fe-minerals,
its
redox-active
phases,
which
may
modulate
organic
C-abundance,
composition,
reactivity
through
complexation
catalytic
processes.
We
characterized
fate,
Fe
fractions,
dissolved
matter
(DOM)
isolates
from
permafrost-thaw
under
varying
conditions.
Under
anoxic
incubation
conditions,
33%
initial
was
lost
as
gaseous
species
within
21
days,
while
oxic
58%
lost.
incubation,
42%
preserved
in
a
fraction.
Lignin-like
compounds
dominated
permafrost-thaw,
followed
by
lipid-
protein-like
compounds.
However,
there
accumulation
lipid-like
reduction
nominal
oxidation
state
over
time,
regardless
compound
classes.
DOM
dynamics
be
affected
microbial
activity
abiotic
processes
mediated
Fe-minerals
related
selective
fractionation
and/or
oxidation.
Chemodiversity
signatures
could
serve
valuable
proxies
track
conditions
permafrost-thaw.
Acid
mine
drainage
(AMD)
raises
a
global
environmental
concern
impacting
the
iron
cycle.
Although
formation
of
Fe(III)
minerals
in
AMD-impacted
waters
has
previously
been
reported
to
be
regulated
by
biological
processes,
role
abiotic
processes
remains
largely
unknown.
This
study
first
that
photochemical
reaction
coupled
with
O
