Tightly intertwined: Waterscapes prompt urgent reconsideration of aquatic insects and their role in agricultural landscapes
The Science of The Total Environment,
Год журнала:
2025,
Номер
966, С. 178728 - 178728
Опубликована: Фев. 1, 2025
Язык: Английский
Assessment of LC-QTOF-MS data independent acquisition for quantification and suspect screening of pesticides in agriculture impacted water samples
Journal of Chromatography A,
Год журнала:
2025,
Номер
1751, С. 465957 - 465957
Опубликована: Апрель 14, 2025
Assessing
the
impact
of
agricultural
pesticides,
and
their
potential
transformation
products,
in
surface
(SW)
groundwater
(GW)
requires
application
target
screening
methodologies
to
cover
maximum
number
species.
This
research
investigates
performance
data
independent
acquisition
(DIA)
mode
for
quantification
compounds
suspect
additional
pesticides
SW
GW
based
on
a
single
chromatographic
run.
Samples
were
analysed
using
liquid
chromatography
quadrupole
time-of-flight
mass
spectrometry
(LC-QTOF-MS)
platform,
combined
with
an
on-line
solid-phase
extraction
(SPE)
step.
A
suite
fungicides
insecticides,
widely
employed
intensive
viticulture
areas,
was
selected
assess
combination
database
product
ion
spectra
more
than
700
pesticides.
As
regards
targets,
method
achieved
limits
(LOQs)
between
2
ng
l-1
25
l-1,
linear
responses
from
LOQs
up
500
l-1.
Accuracy
remained
70
%
120
%,
use
ultrapure
water
calibration
standards.
Suspect
permitted
identification
90
tested
when
added
at
levels
above
50
improving
percentage
correct
identifications
versus
those
attained
operating
LC-QTOF-MS
platform
dependent
(DDA)
mode.
Язык: Английский
Municipal and Industrial Wastewater Treatment Plant Effluent Contributions to Per- and Polyfluoroalkyl Substances in the Potomac River: A Basin-Scale Measuring and Modeling Approach
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Июнь 2, 2025
Managing
per-
and
polyfluoroalkyl
substances
(PFAS)
in
water
resources
requires
a
basin-scale
approach.
Predicted
environmental
concentrations
(PEC)
stream-vulnerability
scores
for
PFAS
were
determined
the
Potomac
River
watershed
eastern
United
States.
Approximately
15%
of
stream
reaches
contained
municipal
and/or
industrial
wastewater
treatment
plant
(WWTP)
discharges
that
are
presumptive
sources,
comprising
from
<1
to
>90%
streamflow.
Mean
annual
PEC,
based
on
summed
eight
detected
WWTP
effluents
(ΣPFASPEC),
all
was
3.8
ng
L-1,
impacted
by
had
perfluorooctanoate
(PFOA)
perfluorooctanesulfonate
(PFOS)
PEC
0.39
0.14
L-1.
For
locations
where
measured-environmental
(MEC)
determined,
contributed
7.8%
(0
65%)
total
streamflow
MEC
greater
than
99%
samples,
indicating
additional
potential
sources.
The
mean
ΣPFASPEC
9.1
L-1
compared
sum
34
Under
mean-August
low-flow,
17%
9.4%
water-supply
intakes
maximum
PFOA
PFOS
exceeding
drinking
contaminant
levels.
Язык: Английский
Mixed pesticide sources identified by using wastewater tracers in rivers of South African agricultural catchments
The Science of The Total Environment,
Год журнала:
2024,
Номер
956, С. 177206 - 177206
Опубликована: Ноя. 6, 2024
The
agriculturally
dominated
region
of
the
Western
Cape,
South
Africa
is
vulnerable
to
pesticide
pollution.
A
2017-2019
monitoring
campaign
in
agricultural
catchments
Grabouw,
Piketberg
and
Hex
River
Valley
identified
year-round
detections
despite
few
applications,
making
pollution
sources
unclear.
To
better
trace
these
catchments,
our
study
measured
19
pharmaceutical
compounds
one
industrial
chemical
as
an
indicator
for
wastewater
treatment
plant
(WWTP)
effluent
-
addition
44
pesticides.
Passive
samplers
were
deployed
monthly
rivers
from
February
2022
March
2023
Valley,
Piketberg,
control
sample
Jonkershoek
Nature
Reserve
(May
2022).
Some
pesticides
without
applications
had
high
detection
frequencies
Groundwater
Ubiquity
Scores,
suggesting
leaching
into
groundwater
connected
rivers.
Cumulative
concentrations
correlated
strongly
with
cumulative
only
catchment,
WWTPs
a
possible
source.
Herbicide
(e.g.,
atrazine)
suggest
contamination
atmospheric
transport,
invasive
or
trail
maintenance.
Environmental
Quality
Standard
(EQS)
imidacloprid,
chlorpyrifos,
terbuthylazine
spiroxamine
was
exceeded
at
least
once
during
1-year
period,
mostly
related
expected
indicating
persistence
continuous
exposure
risk
aquatic
organisms.
Our
first
describe
relevance
source
African
catchments.
Drivers
area
dependent,
emphasizing
need
catchment-specific
understanding.
Future
research
requires
sampling
influent
improve
understanding
transport
pathways
sources.
Язык: Английский