Ecological Indicators,
Год журнала:
2023,
Номер
154, С. 110761 - 110761
Опубликована: Авг. 6, 2023
Studies
on
soil
contamination
caused
by
waste
sites
near
antimony
mining
areas
are
scarce.
For
environmental
protection,
it
is
critical
to
investigate
the
levels,
spatial
distribution,
and
ecological
risk
assessment
of
heavy
metals
(HMs)
in
surface
soils
different
land
use
types
around
identify
related
potential
sources.
In
this
study,
pollution
status,
sources
risks
Hg,
Pb,
Cd,
Cr,
As
Sb
built-up
areas,
woodlands
croplands
were
resolved
for
first
time
combining
self-organizing
maps
(SOM),
K-means
clustering,
geographic
information
systems
(GIS)
positive
matrix
factorization
(PMF).
According
analysis
results
samples,
average
abundance
order
HMs
is:
>
Cd
Pb
Cr
Hg.
The
cumulative
geological
index
defines
as
a
severe
level.
shows
that
all
samples
above
load
67.7%
heavily
polluted.
SOM
divided
studied
elements
into
three
clusters
combined
with
GIS
from
cluster
1,
2,
Hg
3.
PMF
yielded
metals:
natural
dominated
(48.6%),
direct
accumulation
represented
(32.9%)
mixed
human
activities
transportation
(18.5%).
Ecological
construction
area
prominent,
main
contribution
element
high
risk.
This
study
combines
multiple
methods
current
status
metal
environment
mine
slag
sites,
providing
theoretical
basis
better
research
source
control,
contributing
scarcity
site
research.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Март 4, 2025
Groundwater
is
crucial
for
human
society's
development
in
piedmont
plains,
yet
its
hydrogeochemistry
often
exhibits
complex
spatial
distributions
due
to
the
interplay
of
nature
and
factors.
Ninety-two
phreatic
groundwater
samples
were
collected
from
a
typical
plain
northern
China
analyzed
using
self-organizing
map
combined
with
hydrogeochemical
simulation,
diagrams,
entropy-weighted
water
quality
index.
categorized
into
four
clusters,
demonstrating
gradual
facies
evolution
HCO3-Ca
Cl-Mg·Ca
Cl-Na,
along
an
increase
NO3-
content
order
clusters
IV,
II,
III,
I.
Natural
processes,
including
silicates
weathering
reverse
cation-exchange,
establish
natural
fundamental
framework
chemistry,
which
furtherly
sculptured
by
agricultural
substances
input.
was
predominantly
excellent
or
good,
index
(EWQI)
values
below
100
at
over
92%
sampling
sites.
relatively
poorer
upstream
areas
near
mountains
Hutuo
River,
where
stratum
permeability
high,
but
improves
downstream
lower.
Agricultural
land
use
variation
aquifer
are
responsible
observed
variations
chemistry.
contaminants
warrant
attention
protection
plains
that
long-term
activities,
especially
mountains.
This
research
understanding
distribution
chemistry
provides
scientific
guidance
related
management.
