Environmental Science & Technology,
Год журнала:
2022,
Номер
56(20), С. 14397 - 14408
Опубликована: Сен. 28, 2022
The
presence
of
anthropogenic
organic
micropollutants
in
rivers
poses
a
long-term
threat
to
surface
water
quality.
To
describe
and
quantify
the
in-stream
fate
single
micropollutants,
advection–dispersion–reaction
(ADR)
equation
has
been
used
previously.
Understanding
dynamics
mixture
effects
cytotoxicity
that
are
cumulatively
caused
by
micropollutant
mixtures
along
their
flow
path
requires
new
concept.
Thus,
we
extended
ADR
from
defined
then
measured
extracted
same
river
samples.
Effects
(single
mixture)
expressed
as
effect
units
toxic
units,
inverse
concentrations
inhibitory
concentrations,
respectively,
quantified
using
panel
vitro
bioassays.
We
performed
Lagrangian
sampling
campaign
under
unsteady
flow,
collecting
was
impacted
wastewater
treatment
plant
(WWTP)
effluent.
reduce
computational
time,
solution
convolution-based
reactive
transport
approach,
which
simulate
effects.
dissipation
individual
were
reproduced
deterministic
model
following
first-order
kinetics.
experimental
without
known
compositions
captured
ensemble
obtained
through
Bayesian
calibration.
highly
fluctuating
WWTP
effluent
discharge
dominated
temporal
patterns
fluxes
river.
Minor
inputs
likely
runoff
pesticide
diffusion
might
contribute
general
pattern
but
could
not
be
confirmed
model-based
analysis
available
chemical
data.
The
major
lockdown
due
to
the
COVID-19
pandemic
has
affected
socio-economic
development
of
world.
On
other
hand,
there
are
also
reports
reduced
pollution
levels.
In
this
study,
an
indicative
analysis
is
adopted
understand
effect
on
changes
in
water
quality
parameters
for
Lake
Hussain
Sagar
using
two
remote
sensing
techniques:
(i)
spectral
reflectance
(SR)
and
(ii)
chromaticity
(Forel-Ule
color
Index
(FUI)
Excitation
Purity).
empirical
relationships
from
earlier
studies
imply
that
increase
SR
values
(band
B2)
indicates
a
reduction
Chlorophyll-a
(Chl-a)
Colored
Dissolved
Organic
Matter
(CDOM)
concentrations,
FUI
Total
Suspended
Solids
(TSS).
Landsat
8
OLI
satellite
images
comparison
between
January
May
year
2020:
quality,
March
April
years
2015
historical
variations
quality.
results
show
notable
compared
before
after
unlock
suggesting
significant
lake
pollution.
addition,
within
suggest
levels
least
2020.
Environmental Science & Technology,
Год журнала:
2021,
Номер
55(13), С. 8908 - 8917
Опубликована: Июнь 10, 2021
For
a
better
process
understanding
of
in-stream
attenuation
trace
organic
contaminants
(TrOCs),
quantitative
comparisons
between
field
studies
under
different
environmental
conditions
and
controlled
laboratory
experiments
are
important
to
separate
processes.
However,
this
is
hampered
by
the
challenge
transfer
kinetics
from
due
lack
good
measures
account
for
boundary
conditions.
phototransformation,
in
situ
light
river
difficult
determine
because
reduced,
instance,
absorption,
scattering
on
suspended
particles,
shading
effects.
In
study,
we
present
an
approach
photochemical
non-photochemical
diurnal
based
rate
constants
relative
diclofenac,
as
reference
compound,
difference
combined
with
experiments.
12
out
45
detected
target
TrOCs
showed
at
selected
stretch.
A
process,
potentially
biotransformation,
was
responsible
bisoprolol,
metoprolol,
O-desmethylvenlafaxine,
tramadol,
venlafaxine.
Attenuation
amisulpride,
flufenamic
acid,
hydrochlorothiazide,
naproxen,
xipamide
can
be
quantitatively
explained
partially
sotalol.
hydrochlorothiazide
sites
study
published
data
range
over
2
orders
magnitude.
Differences
exposures
but
not
water
chemical
parameters.
Water,
Год журнала:
2022,
Номер
14(21), С. 3536 - 3536
Опубликована: Ноя. 3, 2022
To
investigate
the
impact
of
antidepressants
(ANT)
in
water,
estimates
direct
and
indirect
photolysis
standard
fluoxetine
hydrochloride
(FLX)
a
pharmaceutical
alternative,
sulfate
(FLXSO4),
were
evaluated.
The
second-order
kinetic
constants
ANT
reactive
photoinduced
species
(RPS)
(singlet
oxygen,
1O2;
hydroxyl
radicals,
HO•;
triplet
excited
states
chromophoric
dissolved
organic
matter,
3CDOM*)
obtained
by
competition
kinetics
under
simulated
solar
radiation.
These
parameters
used
combination
with
water
characteristics
to
assess
environmental
persistence
based
on
mathematical
simulations.
results
indicated
that
reactions
HO•
(kFLX,HO•
=
(2.54
±
0.06)
×
109
L
mol−1
s−1;
kFLXSO4,HO•
(3.07
0.03)
s−1)
3CDOM*
(kFLX,3CDOM*
(2.67
0.05)
kFLXSO4,3CDOM*
(1.48
play
more
important
role
degradation
compared
1O2
(kFLX,1O2
(1.37
0.07)
107
kFLXSO4,1O2
(1.63
0.33)
s−1).
main
removal
pathways
biodegradation
following
order
FLX
>
FLXSO4.
Therefore,
presence
anions
can
contribute
sunlit
waters.
Environmental Science & Technology,
Год журнала:
2021,
Номер
55(21), С. 14607 - 14616
Опубликована: Окт. 19, 2021
Measurements
of
chemical
persistence
in
natural
environments
can
provide
insight
into
behavior
not
easily
replicated
laboratory
studies.
However,
it
is
difficult
to
find
environmental
situations
suitable
for
such
measurements,
particularly
substances
with
half-lives
exceeding
several
weeks.
The
objective
this
study
was
demonstrate
that
a
strategic
postflood
monitoring
campaign
be
used
quantify
transformation
on
the
scale
months
real
aquatic
system.
Water
samples
were
collected
upper
Brisbane
River
estuary
36
occasions
over
37
weeks
and
analyzed
127
pharmaceuticals
personal
care
products
(PPCPs),
pesticides,
perfluoroalkyl
(PFASs).
High
quality
time
trend
data
obtained
41
substances.
For
many
these,
input
wastewater
treatment
plant
also
obtained.
A
mass
balance
model
stretch
formulated
parametrized
using
PFASs
as
persistent
benchmarking
chemicals.
Transformation
half-life
estimates
10
PPCPs
7
pesticides
ranging
from
18
260
days.
Furthermore,
dominant
processes
well
magnitude
inputs
their
sources.
approach
developed
shows
under
certain
conditions,
estuaries
organic
contaminants
order
months.
Hydrological Processes,
Год журнала:
2020,
Номер
34(24), С. 4712 - 4726
Опубликована: Сен. 25, 2020
Abstract
Understanding
groundwater–surface
water
(GW–SW)
interactions
is
vital
for
management
in
karstic
catchments
due
to
its
impact
on
quality.
The
objective
of
this
study
was
evaluate
and
compare
the
applicability
seven
environmental
tracers
quantify
localize
groundwater
exfiltration
into
a
small,
human‐impacted
river
system.
Tracers
were
selected
based
their
emission
source
surface
either
as
(a)
dissolved,
predominantly
geogenic
compounds
(radon‐222,
sulphate
electrical
conductivity)
or
(b)
anthropogenic
(predominantly)
originating
from
wastewater
treatment
plant
(WWTP)
effluents
(carbamazepine,
tramadol,
sodium,
chloride).
Two
contrasting
sampling
approaches
compared
assuming
steady‐state
flow
conditions
considering
travel
time
parcels
(Lagrangian
sampling)
through
catchment
account
diurnal
changes
inflow
WWTP.
Spatial
variability
concentrations
all
indicated
sections
preferential
inflow.
Lagrangian
techniques
seem
highly
relevant
capturing
dynamic
concentration
patterns
WWTP‐derived
compounds.
Quantification
GW
with
finite
element
model
FINIFLUX,
observed
in‐stream
Rn
activities
led
plausible
fluxes
along
investigated
reaches
(0.265
m
3
s
−1
),
while
observations
other
natural
produced
less
fluxes.
Important
point
sources
can
be
ascribed
locations
where
crosses
geological
fault
lines.
This
indicates
that
commonly
applied
concepts
describing
diffuse
porous
media
are
difficult
transfer
systems
whereas
fractured
aquifers
may
more
applicable.
In
general,
helps
selecting
best
suited
hydrological
tracer
leads
better
understanding
processes
controlling
systems.
