Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(39), P. 14707 - 14716
Published: Sept. 18, 2023
Plastic
fate
in
freshwater
systems
is
dependent
on
particle
size,
morphology,
and
physicochemical
surface
properties
(e.g.,
charge,
roughness,
hydrophobicity).
Environmental
aging
processes,
such
as
photochemical
weathering
eco-corona
formation
due
to
dissolved
organic
matter
(DOM)
adsorption
plastic
surfaces,
can
alter
their
properties,
affecting
transport.
While
has
been
studied
from
a
materials
science
perspective,
its
specific
implications
environmental
contexts
remain
less
understood.
Although
occur
simultaneously
the
environment,
this
work,
we
systematically
assessed
effects
of
polymers
(polyethylene,
polypropylene,
polyethylene
terephthalate,
polystyrene)
how
influences
DOMs
(Suwannee
River
humic
acid,
fulvic
natural
matter)
relative
pristine
polymers.
Pristine
initially
had
different
distinct
but
upon
aging,
they
became
more
similar
terms
properties.
Photochemical
resulted
decrease
polymer
film
thickness,
an
increase
hydrophilicity.
DOM
adlayers
surfaces
comparable
wettability,
effectively
masking
initial
Collectively,
study
explores
physiochemical
changes
undergo
laboratory
studies
mimicking
conditions.
Understanding
these
step
rationalizing
predicting
processes
interactions
heteroaggregation
that
dictate
plastics
environment.
Journal of Hazardous Materials,
Journal Year:
2024,
Volume and Issue:
469, P. 134040 - 134040
Published: March 13, 2024
Coastal
waters
are
complex
and
dynamic
areas
with
unique
environmental
attributes
that
complicate
the
vertical
migration
of
microplastics
(MPs).
The
MPs
enter
coastal
from
diverse
sources,
including
terrestrial,
riverine,
oceanic,
shoreline
inputs
undergo
various
aging
pathways.
In
this
study,
variations
in
physiochemical
characteristics
undergoing
pathways
their
under
conditions
subjected
to
effects
different
MP
features
were
comprehensively
explored.
Opposite
on
hydrophobic
hydrophilic
observed,
appearing
promote
dispersion
but
enhance
ones.
positive
role
salinity
negative
humic
acid
(HA)
concentrations
identified,
mechanisms
driving
these
analyzed.
Notably,
intense
turbulence
not
only
promoted
floating
positively
buoyant
also
reversed
direction
negatively
downward
upward.
Aging-induced
changes
had
a
limited
effect
migration.
inherent
surrounding
features,
however,
played
major
roles
dynamics.
Microplastics
(MPs)
have
emerged
as
significant
global
concern
zones
hotspots
for
pollution
due
high
population
density.
This
study
investigated
Their
patterns
revealed.
density
identified.
findings
important
implications
understanding
transport
determining
ecological
risks
waters.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(29), P. 10521 - 10531
Published: July 14, 2023
Studies
concerning
the
toxicity
of
pollutant-loaded
nanoplastics
(NPs)
toward
humans
are
still
in
their
infancy.
Here,
we
evaluated
adsorption
microcystins
(MCs)
by
pristine
and
aged
polystyrene
(PSNPs),
prepared
MCs-loaded
PSNPS
(1,
5,
10,
15,
19
μg/mg),
systematically
mapped
key
molecular
changes
induced
PSNPs
to
human
hepatoblastoma
(HepG2)
cells.
According
results,
MC-LR
is
increased
2.64-fold
aging,
PSNP
accumulation
detected
HepG2
The
cytotoxicity
MC-LR-loaded
showed
a
positive
relationship
with
amount,
as
cell
viability
μg/mg
loading
treatment
(aPS-MC19)
was
10.84%
lower
than
PSNPs;
meanwhile,
more
severe
oxidative
damage
observed.
Primary
approaches
involved
stressing
endoplasmic
reticulum
reducing
protein
synthesis
that
posed
for
cells,
while
aggravated
aPS-MC19
combined
result
metabolic
energy
disorder,
damage,
stress,
downregulation
target
protein.
Our
results
confirm
could
bring
into
significantly
interfere
biological
processes,
provide
new
insight
deciphering
risk
NPs
humans.
