Toxics,
Journal Year:
2024,
Volume and Issue:
12(12), P. 934 - 934
Published: Dec. 23, 2024
Heavy
metal
contamination
in
agricultural
soils
has
garnered
increasing
attention,
yet
research
on
the
spatiotemporal
trends
of
heavy
pollution
tropical
regions
with
multiple
annual
crop
harvests
remains
limited.
This
study
examines
data
from
41
studies
published
between
2000
and
2024,
including
206
records
4122
sampling
points
Hainan
Island
China,
to
investigate
spatial
distribution
temporal
pollution.
The
results
reveal
that
average
concentrations
Cd,
Pb,
As,
Cr,
Hg
surface
soil
samples
lands
are
0.12,
28.28,
4.36,
63.98,
0.075
mg/kg,
respectively,
all
below
risk
screening
thresholds
set
by
Soil
Pollution
Risk
Control
Standard
for
Agricultural
Land
(GB
15618-2018).
Spatially,
exhibit
considerable
regional
variation.
Cd
levels
lower
central
region
but
higher
northern
southern
parts
island.
Both
cumulative
index
potential
ecological
elevated
at
ends,
indicating
more
severe
these
areas.
Pb
As
show
similar
patterns,
west
east.
Conversely,
Cr
northeast
southwest.
ends
island,
though
overall
areas
remain
relatively
low.
Temporally,
concentration
metals
increased
over
past
two
decades,
peak
values
occurring
2017
2023.
From
2002
2013,
variation
was
modest,
while
largest
fluctuations
occurred
2014
2016.
Among
metals,
exhibited
most
significant
increase,
pollution,
followed
Hg.
showed
contamination.
Regarding
exceedance
rates,
exceedances
were
evaluated
against
established
GB15618-2018
GB15618-1995.
Cd's
rate
approximately
1%
7.78%
20.93%
following
years,
peaking
2017.
rose
slightly
0%
0.83%,
sporadic
starting
2015.
Although
minor,
a
point
observed
2019.
Exceedance
rates
significantly,
0.75%
7.50%
2019
1.94%
9.44%
2023,
reflecting
increases
4.8
10
times.
These
findings
underscore
need
strengthened
monitoring
management
safeguard
land
quality
ensure
sustainability
local
practices.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Jan. 20, 2025
In
this
study,
the
contamination,
ecological
and
human
health
risks
as
well
source
apportionment
of
As,
Cd,
Co,
Cr,
Cu,
Mn,
Ni,
Pb,
Zn,
V
in
street
dusts
different
land-uses
Kermanshah,
Iran
were
investigated.
A
total
192
dust
samples
taken
from
16
sites
analyzed
for
their
elemental
contents
using
ICP-OES.
The
computed
mean
values
geo-accumulation
index
(I-geo)
pollution
(PI)
ranged
−
6.07
to
2.67
0.023
9.58,
respectively,
indicating
'unpolluted'
'moderately
heavily
polluted',
'slight
very
high
polluted'
levels,
respectively.
load
(PLI)
with
a
cumulative
value
1.03
reflected
moderate
levels
across
entire
study
area.
Moreover,
risk
(RI)
135
indicated
throughout
region.
hazard
(HI)
potentially
toxic
elements
(PTEs)
both
adults
children
all
within
safe
limit
(<
1).
Furthermore,
carcinogenic
(TCR)
showed
that
associated
Ni
target
populations
at
tolerable
unacceptable
levels.
positive
matrix
factorization
(PMF)
model
identified
traffic
emissions
sources,
fossil
fuel
combustion
natural
industrial
major
sources
tested
elements.
Hence,
thorough
investigation
into
contamination
is
recommended
future
studies.
Processes,
Journal Year:
2025,
Volume and Issue:
13(4), P. 1010 - 1010
Published: March 28, 2025
Heavy
metals
are
a
common
type
of
contaminant
found
in
soil.
However,
knowledge
gaps
still
exist
the
characteristics
heavy
facility
farmland
soils.
Therefore,
differential
analysis
was
conducted
on
metal
(Cd,
Cr,
Pb,
As,
Cu,
Zn,
and
Ni)
content
soils
that
were
amended
with
different
types
fertilizers
(T1,
organic
fertilizer;
T2,
fertilizer
chemical
fertilizer).
Regression
employed
to
demonstrate
trends
changes
cropping
durations
(5,
10,
15,
20
years).
The
Pearson
correlation
applied
investigate
between
soil
nutrients
metals,
determine
key
factors
influencing
concentration
through
random
forest
model.
results
indicated
average
Cd
(0.148
mg·kg−1)
higher
than
background
value
but
lower
potential
ecological
risk
threshold
(0.3
mg·kg−1,
6.5
<
pH
≤
7.5).
where
only
0.118
while
both
0.148
mg·kg−1.
There
no
significant
difference
two
fertilization
types.
regression
linear
increasing
trend
as
duration
increased.
showed
there
also
correlations
As
Ni;
SOM
(soil
matter)
Zn;
well
EC
(electrical
conductivity).
model
exhibited
high
prediction
accuracy
when
explaining
most
concentrations
Cd,
Ni,
overall
coefficients
(r)
0.009,
0.44,
0.33,
0.04,
0.32,
0.61,
0.65,
respectively.
Using
Hakanson’s
method
conduct
an
assessment
study
area,
it
level
relatively
low.
proportion
moderate
associated
elements
close
40%,
which
requires
special
attention.
Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(7), P. 3817 - 3817
Published: March 31, 2025
The
issue
of
cadmium
(Cd)
contamination
in
agricultural
soils
has
garnered
significant
attention
due
to
its
implications
for
food
safety
and
environmental
health.
However,
research
on
spatial
temporal
distribution
tropical
zones
with
high
intensity
cropping
remains
limited.
This
study
conducts
a
meta-analysis
38
studies
published
between
2000
2024
comprehensively
assess
Cd
pollution
Hainan
Island,
China,
region
three
cycles
per
year.
By
synthesizing
165
records
from
4110
sampling
sites,
the
analysis
reveals
that
mean
concentration
stands
at
0.12
mg/kg,
peak
values
reaching
3.11
mg/kg.
Approximately
80.44%
sites
fall
into
categories
unpolluted
or
moderately
based
geo-accumulation
index,
while
2.17%
exhibited
heavy
extreme
accumulation,
2.13%
posed
an
ecological
risk
(level
IV).
Spatially,
concentrations
were
lower
central
areas,
such
as
Baisha
County,
but
higher
northwest
southeast,
notably
Haikou
City
Sanya
south.
Over
time,
intensified,
rising
0.09
mg/kg
(2005–2014)
0.16
(2017–2023),
exceedance
rates
around
1%
7.78%
20.93%,
peaking
2017.
increasing
trend
accumulation
is
closely
related
human
activities,
agricultural,
industrial,
transportation-related
activities
playing
increasingly
role
accumulation.
Pesticide
use,
phosphate
fertilizer
application,
industrial
emissions
have
been
identified
major
contributing
factors.
These
findings
highlight
need
targeted
mitigation
strategies
control
sources
ensure
long-term
sustainability
production
Island.
International Journal of Environmental & Analytical Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 15
Published: March 21, 2024
In
the
current
study,
a
total
of
40
agricultural
surface
soil
samples
were
collected
from
sites
in
Hamedan,
Iran
and
contents
As,
Cd,
Cr,
Cu,
Ni,
Pb,
Zn
determined
by
ICP-OES.
The
average
all
analysed
elements
except
Pb
found
to
be
greater
than
those
background
reported
for
Iran,
which
could
presumably
show
anthropogenic
sources
these
elements.
EF
PI
values
decreased
order
As
>
Cr
Cu
Cd
Ni
while,
rank
mean
I-geo
followed
Pb.
Additionally,
cumulative
RI
with
175,
demonstrated
'moderate
ecological
risk'
across
investigated
area.
results
PCC,
PCA,
HCA
showed
that
traffic
activities
regarded
as
most
important
factors
affected
content
PTEs
soils.
conclusion,
an
accurate
investigation
on
probability
environmental
risks
due
pollution
other
persistent
organic
pollutants
(POPs)
is
recommended
future
works.
