Sustainability,
Journal Year:
2025,
Volume and Issue:
17(8), P. 3548 - 3548
Published: April 15, 2025
Riverine
heavy
metal
(HM)
pollution,
a
critical
global
environmental
issue,
severely
affects
water
quality,
ecosystem
health,
and
human
well-being.
The
Huaihe
River,
once
among
China’s
most
polluted,
has
seen
quality
improvements
due
to
strict
pollution
controls,
yet
the
extent
of
HM
reduction
remains
uncertain.
Here,
we
investigated
distribution,
sources,
potential
ecological
health
risks
nine
typical
HMs
(Cr,
Mn,
Ni,
Cu,
Zn,
As,
Cd,
Pb,
Hg)
in
surface
sediment
Anhui
section
river.
Seasonal
variations
concentrations
were
observed,
with
values
below
drinking
safety
limits,
except
for
Mn
Cd
at
specific
sites
seasons.
Indices
including
HPI,
HEI,
HQ,
HI
showed
low
contamination
risks,
children
are
more
vulnerable
non-carcinogenic
hazards,
notably
from
As.
Sediment
trends
decreased
as
>
Zn
Cr
Pb
Ni
Cu
As
Hg,
moderate
based
on
CF,
EF,
Igeo
assessments.
PLI
NPI
suggested
midstream
areas
accumulation.
correlation
analysis
PCA
revealed
that
uncontaminated
sediments
mainly
geogenic
origin,
while
contaminated
largely
influenced
by
anthropogenic
activities,
agricultural
runoff,
industrial
waste,
domestic
sewage
discharge.
Overall,
our
findings
highlight
control
activities
within
River
basin
is
essential
reducing
Frontiers in Microbiology,
Journal Year:
2023,
Volume and Issue:
14
Published: Oct. 23, 2023
Rapid
industrialization
and
urbanization
have
led
to
widespread
metal
contamination
in
aquatic
ecosystems.
This
study
explores
the
tolerance
biosorption
characteristics
of
four
bacterial
strains
(
Serratia
sp.
L2,
Raoultella
L30,
Klebsiella
R3,
R19)
isolated
from
Saint
Clair
River
sediments.
These
effectively
removed
various
cations
(As
3+
,
Pb
2+
Cu
Mn
Zn
Cd
Cr
6+
Ni
)
single
multi-metal
solutions.
Minimum
inhibitory
concentration
(MIC)
assays
revealed
strain-specific
variations
tolerance,
with
L2
L30
exhibiting
higher
tolerance.
Surprisingly,
R3
R19,
despite
lower
demonstrated
superior
removal
efficiency,
challenging
notion
that
dictates
efficacy.
In
single-metal
solutions,
R19
excelled
at
extracting
ions,
while
competitive
binding
solutions
hindered
removal.
However,
retained
efficiencies,
possibly
due
enhanced
flocculation
activities
facilitating
metal-ion
contact.
Comprehensive
Fourier-transform
infrared
(FTIR)
analysis
highlighted
strains’
metal-binding
capabilities,
novel
peaks
emerging
after
exposure,
indicative
extracellular
polymeric
substance
(EPS)
production.
Scanning
electron
microscopy
(SEM)
energy-dispersive
X-ray
spectroscopy
(EDX)
confirmed
accumulation
on
surfaces
within
cytoplasmic
regions
morphological
changes
adsorption
patterns,
emphasizing
ability
adapt
stress.
transmission
(STEM)
EDX
uncovered
cells,
underscoring
complexity
microbial-metal
interactions.
also
confirms
simultaneous
presence
an
aqueous
solution
may
cause
a
mutual
inhibition
each
EPS
resulting
reduced
uptake,
which
emphasizes
need
select
specific
for
given
metal-containing
effluent.
The
differences
distribution
patterns
between
suggest
species-specific
strategies
driven
by
environmental
conditions
availability.
heavy
metal-removing
capabilities
grow
over
wide
range
concentrations
used
this
offer
advantage
employ
these
organisms
remediation
bioreactors
or
situ
.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Aug. 12, 2024
Marine
pollution
caused
by
heavy
metals
has
emerged
as
a
significant
environmental
concern,
garnering
increased
attention
in
recent
years.
The
accumulation
of
the
tissues
marine
organisms
poses
substantial
threats
to
both
ecosystems
and
human
populations
that
rely
on
seafood
primary
food
source.
Fish
crustaceans
are
effective
biomonitors
for
assessing
metal
contamination
aquatic
environments.
In
this
study,
we
determined
concentrations
several
metals,
including
cadmium
(Cd),
lead
(Pb),
nickel
(Ni),
mercury
(Hg),
tin
(Sn),
four
fish
species
(Mugil
cephalus,
Mugil
capito,
L.
aurata,
Morone
labrax)
five
crustacean
(S.
rivulatus,
Cerastoderma
glaucum,
Paratapes
undulatus,
R.
decussatus,
Callinectes
sapidus,
Metapenaeus
Stebbingi)
from
Temsah
Lake
during
winter
summer
seasons.
To
evaluate
potential
ecological
health
risks
associated
with
consuming
these
species,
calculated
index
(MPI),
weekly
intake
(EWI),
target
hazard
quotient
(THQ),
carcinogenic
risk
(CR)
values.
results
revealed
noticeable
increase
levels
compared
studied
samples.
Moreover,
concentration
muscles
generally
exceeded
those
liver
gills.
MPI
values
indicated
labrax
exhibited
highest
winter,
while
aurata
showed
summer.
cephalus
demonstrated
lowest
EWI
were
found
be
lower
than
corresponding
tolerable
(TWI)
Additionally,
under
average
exposure
conditions,
THQ
HI
data
below
one
most
study
area.
CR
investigated
acceptable
levels.
Therefore,
suggests
within
lake
does
not
present
any
hazards
consumers.
Chemicals
have
undoubtedly
improved
our
quality
of
life,
but
the
resulting
environmental
pollution
poses
potential
risks
to
both
environment
and
health.
In
natural
environments,
it
is
common
for
different
types
pollutants
with
distinct
properties
coexist,
leading
contamination
by
chemical
mixtures.
Surprisingly,
origin,
formation
mechanism,
impact
on
quality,
ecosystem
health
mixtures
been
largely
overlooked
in
previous
studies.
Therefore,
this
chapter
aims
comprehensively
investigate
sources,
pathways,
mechanisms
involved
containing
heavy
metals
(HMs)
pesticides
soil
as
well
those
comprising
HMs,
microplastics
(MPs),
nanoparticles
various
media.
Thus,
can
provide
clues
studying
toxicity
predicting
their
joint
toxicity.
