The
soil
physicochemical
properties
play
a
key
role
in
heavy
metals
(HMs)
geochemical
processes
environment.
However,
how
the
of
affect
metal
binding
ability
remains
unclear,
which
limits
our
for
predicting
environmental
behavior
HMs.
In
this
study,
22
types
samples
collected
from
different
regions
China,
and
we
developed
12
machine
learning
(ML)
models
to
predict
adsorption
HMs
by
soils,
utilising
2112
experimental
data
points
these
samples,
investigated
master
control
factors
on
capacity
(Cr,
Pb,
Cd,
As)
using
best
ML
model.
Based
feature
analysis,
reactive
oxides
organic
matter
contents
crucial
determining
oxyanion
(Cr
soil.
Meanwhile,
pH,
particle
size
can
account
majority
differences
cation
(Pb
Cd)
It
is
noteworthy
that
bulk
density
exchangeable
potassium
content
played
relative
HMs,
has
been
studied
less
extensively.
This
study
provides
fresh
perspectives
impact
HM
adsorption.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(3), С. 1690 - 1699
Опубликована: Янв. 8, 2024
Monitoring
contamination
from
per-
and
polyfluoroalkyl
substances
(PFASs)
in
water
systems
impacted
by
aqueous
film-forming
foams
(AFFFs)
typically
addresses
a
few
known
PFAS
groups.
Given
the
diversity
of
PFASs
present
AFFFs,
current
analytical
approaches
do
not
comprehensively
address
range
these
systems.
A
suspect-screening
nontarget
analysis
(NTA)
approach
was
developed
applied
to
identify
novel
groundwater
samples
contaminated
historic
AFFF
use.
total
88
were
identified
both
passive
samplers
grab
samples,
dominated
sulfonate
derivatives
sulfonamide-derived
precursors.
Several
ultrashort-chain
(USC)
(≤C3)
detected,
11
reported
for
first
time
Australian
groundwater.
transformation
products
identified,
including
perfluoroalkane
sulfonamides
(FASAs)
sulfinates
(PFASis).
Two
new
(((perfluorohexyl)sulfonyl)sulfamic
acid;
m/z
477.9068
(E)-1,1,2,2,3,3,4,5,6,7,8,8,8-tridecafluorooct-6-ene-1-sulfonic
424.9482).
This
study
highlights
that
several
are
overlooked
using
standard
target
analysis,
therefore,
potential
risk
all
is
likely
be
underestimated.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(43), С. 19440 - 19453
Опубликована: Окт. 16, 2024
Most
monitoring
programs
next
to
large
per-
and
polyfluoroalkyl
substances
(PFAS)
sources
focus
on
drinking
water
contamination
near
source
zones.
However,
less
is
understood
about
how
these
affect
downgradient
hydrological
systems
food
webs.
Here,
we
report
paired
PFAS
measurements
in
water,
sediment,
aquatic
biota
along
a
gradient
away
from
zones
contaminated
by
the
use
of
legacy
aqueous
film-forming
foam
(AFFF)
manufactured
using
electrochemical
fluorination.
Clustering
analysis
indicates
that
composition
characteristic
AFFF
detectable
fishes
>8
km
source.
Concentrations
38
targeted
extractable
organofluorine
(EOF)
decreased
AFFF-contaminated
concentrations
remained
above
consumption
limits
at
all
locations
within
affected
watershed.
Perfluoroalkyl
sulfonamide
precursors
accounted
for
approximately
half
fish
tissues,
which
explain
>90%
EOF
across
sampling
locations.
Suspect
screening
analyses
revealed
presence
polyfluoroketone
pharmaceutical
species,
fluorinated
agrochemical
likely
does
not
accumulate
biological
suggesting
diffuse
such
as
septic
system
inputs
throughout
watershed
addition
contamination.
Based
results,
consider
hydrologically
connected
regions
watersheds
would
help
ensure
public
health
protection.
Environmental Science Advances,
Год журнала:
2024,
Номер
3(3), С. 366 - 382
Опубликована: Янв. 1, 2024
A
multi-class
method
was
developed
to
identify
PFAS
origin
based
on
chemical
composition,
and
performance
of
the
evaluated
in
a
blinded
test
against
unknowns.
The
showed
great
promise
its
ability
recognize
sample
origin.
Environmental Challenges,
Год журнала:
2024,
Номер
16, С. 100975 - 100975
Опубликована: Июль 6, 2024
Per-
and
polyfluoroalkyl
substances
(PFAS)
are
a
group
of
synthetic
chemicals
known
for
their
widespread
use
in
various
industrial
consumer
products.
They
enter
the
food
chain
via
contaminated
water,
air,
soil,
resulting
bioaccumulation
plants,
fishes,
foods,
human
milk,
blood
serum.
Here,
we
critically
reviewed
literature
published
from
2005
to
2021
on
occurrence
distribution
Perfluorooctanoic
acid
(PFOA)
perfluoro-octane
sulfonate
(PFOS)
as
most
occurring
PFAS
aquatic
environment
sub-Saharan
Africa
(SSA).
To
our
knowledge,
this
is
first
paper
review
status
SSA
environment.
This
found
that
almost
all
matrices
studied
regions
have
been
polluted
by
with
varying
concentrations.
information
suggests
levels
deserve
immediate
attention.
Furthermore,
faces
unique
challenges
understanding
managing
contamination
due
scarcity
data
specific
need
more
administrative
guidelines
monitoring
water.
provides
vital
baseline
occurrences,
contributing
factors
better
protect
public
health,
develop
sustainable
solutions
growing
concern.
