Environmental Science & Technology,
Год журнала:
2021,
Номер
55(20), С. 13891 - 13901
Опубликована: Сен. 29, 2021
Multielement
isotope
fractionation
studies
to
assess
pollutant
transformation
are
well-established
for
point-source
pollution
but
only
emerging
diffuse
by
micropollutants
like
pesticides.
Specifically,
chlorine
is
hardly
explored
promising,
because
many
pesticides
contain
few
atoms
so
that
"undiluted"
position-specific
Cl
effects
can
be
expected
in
compound-average
data.
This
study
combined
Cl,
N,
and
C
sensitively
detect
biotic
abiotic
of
the
widespread
herbicides
groundwater
contaminants
acetochlor,
metolachlor,
atrazine.
For
chloroacetanilides,
hydrolysis
pathways
studied
under
acidic,
neutral,
alkaline
conditions
as
well
biodegradation
two
soils
resulted
pronounced
(εCl
from
−5.0
±
2.3
−6.5
0.7‰).
The
characteristic
dual
C–Cl
patterns
(ΛC–Cl
0.39
0.15
0.67
0.08)
reveal
analysis
provides
a
robust
indicator
chloroacetanilide
degradation.
atrazine,
distinct
ΛC–Cl
values
were
observed
(7.4
1.9)
compared
previous
reports
oxidative
dealkylation
(1.7
0.9
0.6
0.1,
respectively).
3D
approach
allowed
differentiating
transformations
would
not
distinguishable
based
on
N
data
alone.
first
set
together
with
new
atrazine
degradation,
highlights
potential
using
compound-specific
studying
situ
pesticide
Environmental Forensics,
Год журнала:
2019,
Номер
20(2), С. 121 - 128
Опубликована: Апрель 3, 2019
We
investigated
the
occurrence
of
three
pharmaceutical
residues
in
four
wastewater
treatment
plants
(WWTPs)
from
northern
Tunisia.
The
selected
compounds
were
carbamazepine,
naproxen,
and
ibuprofen;
they
are
among
most
commonly
prescribed
widely
used
agents
worldwide.
Samples
(200
mL)
pre-concentrated
using
solid
phase
extraction
(SPE)
enrichment
procedure
analysis
pharmaceuticals
was
performed
with
high-performance
liquid
chromatography
(HPLC-UV).
overall
provided
limits
detection
(LOD)
lower
than
0.5
µg.L−1and
recoveries
78–97%.
For
carbamazepine
compound,
mean
concentrations
60.58,
93.19,
132
µg.L−1
for
Bizerte,
Jendouba,
Tunis
WWTPs,
respectively.
This
not
detected
Beja
WWTPs.
Naproxen
ibuprofens
Jendouba
WWTP
but
found
other
WWTPs
ranging
2.94
to
36.17
8.02
43.22
µg.L−1,
From
obtained
data,
it
seems
that
these
able
eliminate
this
kind
micro-pollutants.
Environmental Pollution,
Год журнала:
2020,
Номер
266, С. 114988 - 114988
Опубликована: Июль 1, 2020
A
wide
variety
of
sampling
techniques
and
strategies
are
needed
to
analyze
polycyclic
aromatic
compounds
(PACs)
interpret
their
distributions
in
various
environmental
media
(i.e.,
air,
water,
snow,
soils,
sediments,
peat
biological
material).
In
this
review,
we
provide
a
summary
commonly
employed
methods
strategies,
as
well
discussion
routine
innovative
approaches
used
quantify
characterize
PACs
frequently
targeted
samples,
with
specific
examples
applications
Canadian
investigations.
The
pros
cons
different
analytical
techniques,
including
gas
chromatography
-
flame
ionization
detection
(GC-FID),
GC
low-resolution
mass
spectrometry
(GC-LRMS),
high
performance
liquid
(HPLC)
ultraviolet,
fluorescence
or
MS
detection,
high-resolution
(GC-HRMS)
compound-specific
stable
(δ13C,
δ2H)
radiocarbon
(Δ14C)
isotope
analysis
considered.
Using
an
example
research
carried
out
Canada's
Athabasca
oil
sands
region
(AOSR),
where
alkylated
hydrocarbons
sulfur-containing
dibenzothiophenes
targeted,
the
need
move
beyond
standard
list
sixteen
EPA
priority
PAHs
for
adoption
AOSR
bitumen
PAC
reference
highlighted.
Environmental Science & Technology,
Год журнала:
2021,
Номер
55(8), С. 4720 - 4728
Опубликована: Март 24, 2021
Current
approaches
are
often
limited
to
evaluating
the
contribution
of
pesticide
dissipation
processes
in
water-sediment
systems
as
both
degradation
and
phase
transfer,
that
is,
sorption-desorption,
contribute
apparent
decrease
concentration.
Here,
widely
used
herbicides
acetochlor
S-metolachlor
was
examined
laboratory
by
microcosm
experiments
under
oxic
anoxic
conditions.
Compound-specific
isotope
analysis
(CSIA)
emphasized
insignificant
carbon
fractionation
sediment,
indicating
prevailing
water
phase.
Conceptual
modeling
accounting
for
transfer
biodegradation
indicated
may
be
underestimated
when
is
not
included.
Phase
does
affect
a
wide
spectrum
molecules
environmental
conditions,
underscoring
potential
CSIA
robust
approach
evaluate
systems.
coupled
with
identification
transformation
products
high-resolution
tandem
mass
spectrometry
suggests
occur
via
nucleophilic
substitution
predominance
oxalinic
acids
Altogether,
combining
CSIA,
products,
use
conceptual
phase-transfer
models
improves
interpretation
Environmental Science & Technology,
Год журнала:
2021,
Номер
55(20), С. 13891 - 13901
Опубликована: Сен. 29, 2021
Multielement
isotope
fractionation
studies
to
assess
pollutant
transformation
are
well-established
for
point-source
pollution
but
only
emerging
diffuse
by
micropollutants
like
pesticides.
Specifically,
chlorine
is
hardly
explored
promising,
because
many
pesticides
contain
few
atoms
so
that
"undiluted"
position-specific
Cl
effects
can
be
expected
in
compound-average
data.
This
study
combined
Cl,
N,
and
C
sensitively
detect
biotic
abiotic
of
the
widespread
herbicides
groundwater
contaminants
acetochlor,
metolachlor,
atrazine.
For
chloroacetanilides,
hydrolysis
pathways
studied
under
acidic,
neutral,
alkaline
conditions
as
well
biodegradation
two
soils
resulted
pronounced
(εCl
from
−5.0
±
2.3
−6.5
0.7‰).
The
characteristic
dual
C–Cl
patterns
(ΛC–Cl
0.39
0.15
0.67
0.08)
reveal
analysis
provides
a
robust
indicator
chloroacetanilide
degradation.
atrazine,
distinct
ΛC–Cl
values
were
observed
(7.4
1.9)
compared
previous
reports
oxidative
dealkylation
(1.7
0.9
0.6
0.1,
respectively).
3D
approach
allowed
differentiating
transformations
would
not
distinguishable
based
on
N
data
alone.
first
set
together
with
new
atrazine
degradation,
highlights
potential
using
compound-specific
studying
situ
pesticide
