Environment & Health,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 24, 2024
Mitigating
mercury
(Hg)
risk
in
the
rice-paddy
system
is
crucial
for
safeguarding
food
safety
and
human
health,
as
rice
a
main
source
of
exposure
to
neurotoxic
methylmercury
(MeHg).
Current
mitigation
strategies
predominantly
focus
on
reducing
availability
inorganic
Hg
(IHg)
methylation,
achieved
primarily
through
emission
control
situ
immobilization.
While
these
IHg-targeted
approaches
have
effectively
reduced
MeHg
bioaccumulation
subsequent
exposure,
their
efficacy
largely
undermined
by
transformations
fluctuating
environmental
conditions
due
complex
protracted
pathway
linking
IHg
from
sources
at
point
exposure.
In
light
recent
advancements
MeHg-related
transformations,
we
emphasize
development
MeHg-targeted
improve
overall
efficiency
management
systems.
include
microbial
regulation
diminish
net
production,
facilitating
demethylation
soils,
promoting
vivo
degradation
within
plants.
Although
are
still
nascent
stages,
they
hold
significant
promise
potential
high
uncertainties,
owing
shorter
between
production
Integrating
IHg-
offers
comprehensive
synergistic
approach,
paving
way
more
effective
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 18, 2025
It
has
been
previously
observed
that
rainwater
input
into
paddy
rice
soils
reduced
the
level
of
grain-borne
arsenic,
and
it
is
hypothesized
a
Fenton-like
reaction
triggered
by
interaction
between
rainwater-borne
hydrogen
peroxide
ferrous
iron
in
responsible
for
microbially
mediated
impediment
As
uptake
plants.
However,
this
hypothesis
remains
untested.
This
study
tested
through
mesocosm
experiments,
confirming
hydroxyl
radical
(•OH)
generation,
elevating
soil
redox
potential,
oxidizing
arsenite
to
less
phytoavailable
arsenate
porewater,
thereby
reducing
accumulation
grain.
Comparison
two
crops
cultivation
with
different
fluxes
confirms
seasonal
rainfall
variation
an
impact
on
receiving
more
having
lower
arsenic
concentration
grain
compared
rainfall.
Using
China's
major
rice-producing
region
as
example,
demonstrated
spatial
regime
could
geographical
distribution
at
national
scale.
The
findings
have
implications
assessment
management
environmental
risk
from
arsenic-contaminated
grains.
Environmental Science & Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 21, 2024
Wildfire
and
stubble
burning
release
substantial
amounts
of
black
carbon
(BC)
into
natural
environments
that
experience
frequent
redox
oscillations,
such
as
wetlands
farmlands.
Here,
we
report
oscillations
can
effectively
drive
ROS
production
from
BC.
Following
sequential
microbial
reduction
air
exposure,
6.5
±
0.2
μM/g
