Sustainability,
Год журнала:
2025,
Номер
17(8), С. 3548 - 3548
Опубликована: Апрель 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
Abstract
New
polymeric
spheres
of
sodium
alginate
(AlgNa)
containing
dicarboxylic
acids—maleic
acid
(MA)
and
oxalic
(OA)—were
developed
for
adsorption
copper
metal
from
water.
Water
capacity,
elementary
composition,
structural,
morphological,
vibrational,
thermal
properties
were
characterized
by
scanning
electron
microscopy
(SEM),
intumescence
degree
(IG),
X‐ray
diffraction
(XRD),
Fourier
transform
infrared
(FT‐IR)
spectroscopy,
differential
calorimetry.
SEM
data
revealed
that
functionalization
with
acids
affects
the
morphology
surface
AlgNa
matrix.
Sample
MA
(0.35
±
0.004
g)
absorbs
more
water
than
OA
sphere
(0.28
0.007
g).
XRD
patterns
showed
AlgNa–MA
samples
exhibit
an
amorphous
nature,
whereas
AlgNa–OA
sample
has
a
partially
crystalline
phase.
Adsorption
experiments
conducted
to
analyze
whether
synthesized
could
be
optimized
reach
best
performance
in
adsorption.
The
adsorbents
most
efficient
at
highest
dosage
used
(250
mg),
corresponding
removal
percentages
84.54
3.97%
(AlgNa),
94.21
3.04%
(AlgNa–MA),
84.22
3.39%
(AlgNa–OA).
energy‐dispersive
spectroscopy
maps
validated
incorporation
Cu
2+
ions
on
adsorbents.
Kinetic
isotherm
assays
confirmed
efficiency
spheres.
