This
study
represents
the
first
comprehensive
investigation
of
16
polycyclic
aromatic
hydrocarbons
(PAHs)
in
multimedia
system
Lake
Ulansuhai.
It
explores
their
occurrence,
sources,
transport
behavior,
and
associated
risks
to
human
health
ecosystems.
Samples
dissolved
phase
(DP),
suspended
particulate
matter
(SPM),
sediment
(SD)
were
collected
from
seven
stations
during
ice-free
period
July
2022
ice
January
2023.
The
results
revealed
that
concentrations
∑PAHs
DP
(29.9~82.7
ng/L)
SD
(88.0~357
ng/g)
exhibited
minimal
variation
with
no
significant
seasonal
differences.
In
contrast,
SPM
(794~4692
showed
a
larger
range
significantly
higher
(2634
compared
(1032
ng/g).
Spatially,
northern
part
Ulansuhai
displayed
PAH
content.
2–3
rings
PAHs
predominant
DP,
4
5–6
mainly
present
SD.
Diagnostic
isomeric
ratios
indicated
primarily
derived
combustion
sources.
However,
source
quantification
using
PMF
models
biomass
accounted
for
51.59%
coal
40.03%
sources
periods,
respectively.
Additionally,
traffic
emissions
petroleum
made
minor
contributions.
distribution
within
situ
DP-SPM-SD
demonstrated
was
influenced
by
hydrophobicity.
Fugacity
calculations
2-4
acted
as
secondary
emissions.
Toxicity
assessment,
TEQPAH
values
posed
carcinogenic
risk
humans.
Risk
quotient
(RQ)
SD,
medium
high
ecological
risk.
These
findings
provide
crucial
information
policymakers
develop
effective
strategies
reducing
watershed.
IOP Conference Series Earth and Environmental Science,
Journal Year:
2025,
Volume and Issue:
1487(1), P. 012004 - 012004
Published: April 1, 2025
Abstract
Five
different
sites
along
Tigris
River
from
Baghdad
to
Wasit
were
examined
for
the
concentrations,
distribution,
sources,
and
ecological
risk
levels
of
polycyclic
aromatic
hydrocarbons
(PAHs).
The
total
concentrations
16
PAHs
in
five
sample
ranged
117.25
μg/L
327.09
μg/L.
In
addition,
isomer
ratio
indicate
that
main
sources
are
combustion
processes,
such
as
burning
fuel,
coal,
gasoline,
automobile
emissions.
All
study
needed
particular
caution
since
B(a)A
B(b)F
demonstrated
higher
potential
harm
than
other
PAHs,
depending
on
characteristics
RQ(NCs)
>
1
RQ(MPCs)
<
1.
Furthermore,
an
assessment
indicated
moderate
environmental
concerns,
emphasizing
necessity
ongoing
PAH
contamination
monitoring.
Toxics,
Journal Year:
2024,
Volume and Issue:
12(9), P. 653 - 653
Published: Sept. 5, 2024
Polycyclic
aromatic
hydrocarbons
(PAHs)
are
persistent
organic
pollutants
that
pose
significant
environmental
and
health
risks.
These
compounds
originate
from
both
natural
phenomena,
such
as
volcanic
activity
wildfires,
anthropogenic
sources,
including
vehicular
emissions,
industrial
processes,
fossil
fuel
combustion.
Their
classification
carcinogenic,
mutagenic,
teratogenic
substances
link
them
to
various
cancers
disorders.
PAHs
categorized
into
low-molecular-weight
(LMW)
high-molecular-weight
(HMW)
groups,
with
HMW
exhibiting
greater
resistance
degradation
a
tendency
accumulate
in
sediments
biological
tissues.
Soil
serves
primary
reservoir
for
PAHs,
particularly
areas
of
high
creating
substantial
risks
through
ingestion,
dermal
contact,
inhalation.
Coastal
aquatic
ecosystems
especially
vulnerable
due
concentrated
human
activities,
PAH
persistence
disrupting
microbial
communities,
inhibiting
plant
growth,
altering
ecosystem
functions,
potentially
leading
biodiversity
loss.
In
plants,
contamination
manifests
form
abiotic
stress,
inducing
oxidative
cellular
damage,
growth
inhibition.
Plants
respond
by
activating
antioxidant
defenses
stress-related
pathways.
A
notable
aspect
defense
mechanisms
involves
plant-derived
extracellular
vesicles
(PDEVs),
which
membrane-bound
nanoparticles
released
cells.
PDEVs
play
crucial
role
enhancing
facilitating
intercellular
communication
coordinating
responses.
The
interaction
between
PDEVs,
while
not
fully
elucidated,
suggests
complex
interplay
mechanisms.
may
contribute
detoxification
pollutant
sequestration
or
delivering
enzymes
capable
degradation.
Studying
provides
valuable
insights
stress
resilience
offers
potential
new
strategies
mitigating
PAH-induced
plants
ecosystems.
