bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2023,
Volume and Issue:
unknown
Published: June 13, 2023
ABSTRACT
Groundwater
biogeochemistry
in
coastal
areas
is
spatially
and
temporally
dynamic
because
fluctuations
groundwater
level
may
cause
alternate
redox
between
distinct
hydrological
conditions.
Recent
studies
have
proposed
connections
large-scale
processes,
specifically
focusing
on
the
role
of
redox-active
compounds
changing
oxidation
state
during
flooding
draining
events.
While
water
saturation
generally
results
a
shift
from
electron
donors
to
acceptors,
specific
mechanisms
underlying
transition
oxidizing
reducing
conditions
response
are
uncertain.
To
determine
effects
levels
dynamics,
we
monitored
potential
across
terrestrial-aquatic
interface
Lake
Erie
throughout
high
low-water
seasons.
In
contrast
previously
observed
responses
soils,
our
revealed
patterns
potentials
high-water
periods.
Furthermore,
short-term
table
significantly
impacted
when
dissolved
oxygen
increased,
dynamics
displayed
voltage
hysteresis
most
Based
these
findings,
propose
that
for
improved
predictions
microbial
functions
biogeochemical
cycles,
redox-informed
models
should
incorporate
antagonistic
changes
balance
compared
soils
consider
time
lags
fluctuations.
Graphical
Abstract
Conceptual
diagram
ecosystems.
Large
derived
by
inputs
smaller
more
frequent
led
sensitive
species
leaching
topsoil.
Progress in Disaster Science,
Journal Year:
2024,
Volume and Issue:
22, P. 100318 - 100318
Published: Feb. 29, 2024
Coastal
aquifers
are
hydraulically
connected
to
the
sea
and
a
storm
(cyclone/hurricane)
can
disrupt
surface
water-groundwater
(SW-GW)
interaction
process
which
is
largely
unexplored.
Thus,
this
study
aims
explore
impact
of
surges
(both
positive
negative)
on
coastal
aquifers,
focusing
pollutant
mobilization,
groundwater
level
(GWL)
fluctuations,
solute
concentration
(Salinity,
Cl)
subsequent
re-stabilization
based
pre-existing
studies
from
coast
USA
India
through
systematic
review
process.
The
outcome
revealed
that
there
relationship
between
cyclonic
speed,
rainfall,
surge
height
GWL
in
lithologically
conductive
aquifers.
Positive
raises
GWL,
salinity
transportation
contaminants
into
while
negative
induces
fall
salinity,
accelerates
submarine
discharge
exports
contaminants/nutrients
sea.
restabilization
SW-GW
dynamics
case
dependent,
takes
week
month
years,
dependent
local
hydrogeology
intensity
storm.
So,
recommends
prioritizing
safeguard
otherwise
increasing
storms
will
lead
questions
freshwater
sustainability
ecosystems
present
climate
change
scenario.
ACS ES&T Water,
Journal Year:
2024,
Volume and Issue:
4(7), P. 2871 - 2881
Published: June 13, 2024
Understanding
the
dynamics
of
arsenic
species
(As(V)
and
As(III))
in
water
is
crucial
for
mitigating
their
significant
health
risks.
Here,
we
demonstrate
exceptional
ability
chalcopyrite
minerals
to
convert
As(V)
into
As(III),
achieve
100%
removal
over
a
broad
range
concentrations
(0.005–50
mg/L).
This
unique
process
combines
adsorption
with
photocatalytic
redox
reactions,
where
first
adsorbed
on
mineral
surface
then
reduced
As(III)
by
photogenerated
electrons.
Density
functional
theory
calculations
reveal
"Cu(I)–Fe(III)
redox-couple"
within
as
key
driver
this
efficient
photocatalysis.
redox-couple
exhibits
excellent
light
absorption
excitation
dynamics,
facilitating
rapid
transfer
electrons
Fe
site
reduction.
research
unveils
previously
unknown
pathway
reduction
natural
environment,
potentially
impacting
our
comprehension
global
geochemical
cycle
toxic
As
element.
Toxics,
Journal Year:
2024,
Volume and Issue:
12(12), P. 839 - 839
Published: Nov. 22, 2024
The
distribution
of
trace
metals
(TMs)
in
a
continuous
water
body
often
exhibits
watershed
attributes,
but
the
tidal
gates
coastal
rivers
may
alter
their
transformation
and
accumulation
patterns.
Therefore,
gate-controlled
river
was
selected
to
test
risks
Al,
As,
Cr,
Cu,
Fe,
Mn,
Ni,
Sr,
Zn
catchment
area
(CA),
estuarine
(EA),
offshore
(OA).
Associations
between
TMs
bacterial
communities
were
analyzed
assess
feasibility
using
parameters
as
ecological
indicators.
results
showed
that
As
Cr
key
pollutants
due
higher
enrichment
factor
geoaccumulation
index,
reaching
slight
moderate
pollution
levels.
Nemero
index
highest
EAs
(14.93),
indicating
risk
sediments
near
tide
gates.
Although
TM
dynamics
can
be
explained
by
metal-indicating
effects
Fe
they
have
no
linear
relationships
with
toxic
metals.
Interestingly,
metabolic
abundance
good
correlations
different
sediment.
These
highlight
community
characteristics
effective
biomarkers
for
assessing
practical
tools
managing
control
environment.
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2023,
Volume and Issue:
unknown
Published: June 13, 2023
ABSTRACT
Groundwater
biogeochemistry
in
coastal
areas
is
spatially
and
temporally
dynamic
because
fluctuations
groundwater
level
may
cause
alternate
redox
between
distinct
hydrological
conditions.
Recent
studies
have
proposed
connections
large-scale
processes,
specifically
focusing
on
the
role
of
redox-active
compounds
changing
oxidation
state
during
flooding
draining
events.
While
water
saturation
generally
results
a
shift
from
electron
donors
to
acceptors,
specific
mechanisms
underlying
transition
oxidizing
reducing
conditions
response
are
uncertain.
To
determine
effects
levels
dynamics,
we
monitored
potential
across
terrestrial-aquatic
interface
Lake
Erie
throughout
high
low-water
seasons.
In
contrast
previously
observed
responses
soils,
our
revealed
patterns
potentials
high-water
periods.
Furthermore,
short-term
table
significantly
impacted
when
dissolved
oxygen
increased,
dynamics
displayed
voltage
hysteresis
most
Based
these
findings,
propose
that
for
improved
predictions
microbial
functions
biogeochemical
cycles,
redox-informed
models
should
incorporate
antagonistic
changes
balance
compared
soils
consider
time
lags
fluctuations.
Graphical
Abstract
Conceptual
diagram
ecosystems.
Large
derived
by
inputs
smaller
more
frequent
led
sensitive
species
leaching
topsoil.
