Water,
Год журнала:
2023,
Номер
15(19), С. 3346 - 3346
Опубликована: Сен. 24, 2023
Solar
irradiation
in
aquatic
systems
can
induce
the
conversion
of
substances
from
solid
to
dissolved
phase
(photodissolution).
Yet,
photochemical
release
organic
nitrogen
(DON)
internal
particles
lakes
remains
largely
unknown.
In
this
study,
suspensions
algal
detritus
and
sediment
a
shallow
eutrophic
lake
were
exposed
simulated
solar
irradiation,
compositional
changes
matter
explored
by
measuring
their
UV–Visible
absorption
spectroscopy
ultrahigh
resolution
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
(FT-ICR
MS).
The
inorganic
during
incubations
was
also
investigated.
Results
showed
that
light
induced
stronger
carbon
DON
production
suspensions,
with
rates
1.17
mg
C
L−1
h−1
0.14
N
h−1,
respectively,
at
an
concentration
0.1
dry
g
L−1.
Light
both
suspensions.
A
larger
number
molecules
lower
molecular
weight
continuously
released
e.g.,
total
formulas
increased
1349
4135
8
h
irradiation.
contrast,
upon
decreased
diversity
aromaticity.
ammonium
(photoammonification)
higher
rate
0.015
which
may
contribute
eutrophication
lake.
This
study
provides
new
insights
into
typical
lakes.
Environment International,
Год журнала:
2019,
Номер
130, С. 104916 - 104916
Опубликована: Июнь 19, 2019
In
this
work,
the
distribution
of
organic
phosphorus
(Po)
species
in
sediment
profiles
five
shallow
lakes
was
analyzed
and
its
effect
on
photo-release
dissolved
phosphate
(Pi)
investigated
during
resuspension
under
simulated
sunlight
irradiation.
The
results
show
that
Po
highly
enriched
surface
gradually
decreased
as
depths
increased:
33.10
±
2.55-96.71
7.60
mg/kg,
33.55
2.34-142.86
5.73
57.50
3.46-149.68
7.67
55.18
4.67-168.73
8.31
98.75
7.56-275.74
10.70
mg/kg
for
Lake
Hou,
Tuan,
Tangling,
Guozheng
Miao,
respectively.
amount
Pi
composed
sediments
also
higher
than
deep
irradiation
9
h.
potential
reasons
these
are:
(1)
difference
morphology
composition
at
different
depths:
mean
particle
size
first
then
increased
increased;
(2)
with
profiles:
more
photolytic
existed
confirmed
by
sequential
extraction
31P
NMR
analysis;
(3)
OH
production
irradiation,
which
directly
influence
from
photodegradation
phosphorus.
All
indicate
plays
an
important
role
P
cycle
may
be
one
pathways
supplement
lakes.
