Water,
Год журнала:
2023,
Номер
15(22), С. 3875 - 3875
Опубликована: Ноя. 7, 2023
The
outbreak
of
COVID-19
led
to
the
extensive
use
disinfectants
in
urban
areas.
These
disinfectants,
along
with
disinfection
by-products
(DBPs),
eventually
enter
waters
and
affected
aquatic
organisms.
But
little
information
could
be
obtained
on
threatening
ecosystems.
This
study
was
conducted
obtain
insight
into
effects
massive
freshwater
ecosystems,
DBPs,
phytoplankton,
zooplankton
nine
two
country
lakes
Wuhan
during
pandemic;
addition,
residual
chlorine
South
Lake
(one
lakes),
investigated.
concentration
ranged
from
0.000
mg
L−1
0.427mg
L−1,
an
average
0.092
L−1.
total
concentrations
DBPs
(halogenated
aliphatic
aromatic
halogenated
DBPs)
detected
4.22
μg
16.59
5.92
7.84
respectively.
There
no
significant
difference
content
between
(p
<
0.05).
Mann–Whitney
U
tests
showed
differences
plankton
cell
density,
biomass,
alpha
diversity
indexes
lakes,
except
for
Shannon−Wiener
index
phytoplankton.
Beta
demonstrated
that
communities
at
different
sampling
stations
were
not
significantly
separated
groups,
but
rather
intersected
each
other.
Variance
partitioning
analysis
revealed
composition
primarily
influenced
by
other
organisms
community
stability
under
conditions
investigated
factors.
Results
indicated
disinfectants.
It
deduced
this
had
impact
communities.
Environmental Toxicology and Chemistry,
Год журнала:
2024,
Номер
43(10), С. 2199 - 2210
Опубликована: Июль 29, 2024
We
investigated
the
occurrence
and
environmental
risk
of
eight
contaminants
emerging
concern
(CECs;
acetaminophen,
naproxen,
diclofenac,
methylparaben,
17β-estradiol,
sulfathiazole,
sulfadimethoxine,
sulfamethazine)
in
three
Brazilian
water
bodies,
namely,
Monjolinho
River
Basin
(São
Paulo
State),
Mogi
Guaçu
Itapecuru
(Maranhão
State)
sampling
campaigns.
The
CECs
were
only
quantified
surface
samples
collected
at
Basin.
Acetaminophen,
methylparaben
detected
range
<200
to
575.9
ng
L
Toxics,
Год журнала:
2024,
Номер
12(3), С. 171 - 171
Опубликована: Фев. 23, 2024
Various
studies
have
shown
that
the
heavy
use
of
pharmaceuticals
poses
serious
ecological
risks,
especially
in
metropolitan
areas
with
intensive
human
activities.
In
this
study,
spatial
distribution,
sources,
and
risks
29
82
surface
waters
collected
from
North
Canal
Basin
Beijing
were
studied.
The
results
showed
pharmaceutical
concentrations
ranged
not
detected
to
193
ng/L,
ampicillin
being
undetected
while
ofloxacin
had
a
100%
detection
frequency,
which
indicates
widespread
occurrence
pollution
Basin.
comparison
other
freshwater
study
areas,
generally
at
moderate
levels.
It
was
found
always
higher
rivers
directly
received
wastewater
effluents.
Source
analysis
conducted
using
positive
matrix
factorization
model.
Combining
patterns
pharmaceuticals,
it
has
been
effluents
contributed
most
loads
studied
basin,
suburban
possible
contribution
untreated
demonstrated.
Risk
assessment
indicated
approximately
55%
posed
low-to-high
combining
risk
analyses,
is
advised
controlling
WWTP
effluent
probably
cost-effective
measure
treating
pollution.
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Май 9, 2024
Abstract
Pharmaceuticals
and
personal
care
products
(PPCPs)
have
received
global
attention
owing
to
their
potential
risks
human
health
the
ecological
environment.
However,
limited
research
has
explored
occurrence
of
PPCPs
in
Qiantang
River
(QTR).
QTR,
largest
water
system
Zhejiang
Province,
China,
is
significantly
influenced
by
activities.
This
study
investigated
occurrence,
distribution,
10
types
both
surface
sediment
within
QTR.
The
findings
revealed
that
concentrations
detected
ranged
from
81.26
149.45
ng/L
during
wet
season
(September)
98.66
198.55
dry
(April).
Moreover,
sediments,
PPCP
concentration
63.24
80.66
72.54
75.06
ng/g
dw
seasons,
respectively.
Among
selected
PPCPs,
triclosan
(TCS)
exhibited
highest
across,
different
phases
followed
benzotriazole
water.
analysis
sediment-seawater
equilibrium
distribution
indicated
diffusion
tendency
was
closely
correlated
with
molecular
weights.
Particularly,
TCS
dynamic
between
sediment.
Principal
component
positive
matrix
factorization
model
results
similar
pollution
sources
for
PPCPs.
dominant
were
identified
as
wastewater
electroplating
enterprises,
discharge
treatment
plants,
domestic
sewage.
risk
assessment
based
on
quotient
method
posed
a
high
low
across
all
sampling
sites.
other
showed
either
no
or
risks.
Additionally,
higher
than
season.
The
objective
of
this
study
is
to
synthesize
and
characterize
two
types
organic
montmorillonites,
namely
H-Mt
O-Mt,
through
the
modification
sodium
montmorillonite
(Na-Mt)
using
quaternary
ammonium
salt
surfactants,
specifically
hexadecyl
dimethyl
benzyl
chloride
(HDBAC)
octadecyl
(ODBAC).
And
application
O-Mt
as
acetaminophen
(PCT),
an
adsorbent
for
emerging
pharmaceutical
contaminant,
in
wastewater
treatment
was
investigated.
Fourier
transform
infrared
spectroscopy
(FTIR)
X-ray
diffractometer
(XRD)
results
demonstrated
successful
intercalation
both
modifiers
into
Na-Mt.
intermittent
adsorption
experiments
that
optimal
dosages
were
1.6
CEC
1.0
(CEC
cation
exchange
capacity
Na-Mt),
respectively.
saturated
capacities
PCT
reached
25.91
mg/g
(H-Mt)
14.71
(O-Mt)
at
pH
5,
respectively,
while
original
Na-Mt
exhibited
a
significantly
lower
only
0.77
mg/g.
Additionally,
it
observed
on
inferior
H-Mt,
suggesting
longer
alkyl
hydrocarbon
chain
has
larger
steric
hindrance
during
process,
which
prevents
from
entering
site
montmorillonite.
by
Mt
more
accurately
described
pseudo-second-order
kinetic
model
Freundlich
isotherm
equation.
negative
ΔG○
values
ΔH○
determined
thermodynamic
parameters
confirmed
spontaneous
exothermic
process.
present
validated
potential
functionalized
with
HDBAC
ODBAC
highly
effective
contaminant.
