Environmental Research,
Год журнала:
2024,
Номер
262, С. 119859 - 119859
Опубликована: Авг. 27, 2024
This
study
used
dual
stable
isotopes
to
examine
nitrate
sources
and
geographical
distribution
in
the
Liao
River
Basin
(LRB),
one
of
China's
seven
major
river
basins.
During
a
normal
hydrological
season
April
2021,
water
samples
were
taken
from
main
streams
(MLR),
Shuangtaizi
(STR),
Hun
(HR),
Taizi
(TZR),
Daliao
(DLR).
Monitoring
results
indicated
that
93%
had
total
nitrogen
level
exceeding
Class
IV
limit
(1.5
mg/L)
'Environmental
Quality
Standards
(EQS)
for
surface
water',
indicating
serious
pollution
status.
71.3%
on
average
was
form
nitrate.
The
scatterplots
δD-H
Water,
Год журнала:
2024,
Номер
16(13), С. 1886 - 1886
Опубликована: Июль 1, 2024
This
study
provides
an
in-depth
analysis
of
the
hydrochemical
characteristics
and
their
controlling
factors
in
lower
reaches
Yellow
River.
Through
water
quality
sampling
over
two
hydrological
periods
within
a
year,
combined
with
methods
machine
learning
techniques,
reveals
joint
impact
natural
human
activities
on
spatiotemporal
variations
constituents.
The
findings
indicate
that
River
exhibits
weak
alkalinity
(the
pH
is
between
7
8),
primary
type
being
HCO3·SO4—Ca·Na·Mg.
temporal
variation
constituents
mainly
influenced
by
rainfall,
where
nitrate
levels
are
higher
during
flood
season
due
to
flushing
effect
whereas
other
show
opposite
pattern
dilution
rainfall.
spatial
River’s
hydrochemistry
primarily
controlled
combination
Using
Gibbs
diagram
analysis,
it
identified
rock
weathering
main
source
ionic
constituents,
while
agricultural
fertilization,
industrial
emissions,
domestic
wastewater
discharge
have
significant
impacts
Compared
rivers
worldwide,
concentration
relatively
high,
especially
sulfate,
which
closely
related
geological
basin
intense
middle
reaches.
Principal
component
for
dry
dissolution
activities,
followed
wastewater;
season,
wastewater.
research
provide
theoretical
support
resource
management
protection
