Toxics,
Journal Year:
2024,
Volume and Issue:
12(7), P. 523 - 523
Published: July 20, 2024
Phosphorus
(P)
is
a
crucial
nutrient
in
lake
ecosystems
and
organic
phosphorus
(Po)
significant
component.
However,
the
distribution
characteristics
migration
behaviour
of
Po
ice-water-sediment
systems
under
freezing
thawing
conditions
cold
arid
regions
remain
unclear.
This
study
aims
to
investigate
forms
its
contribution
endogenous
P
pollution.
We
selected
three
lakes
(Dai,
Hu,
Wu
Lake)
employed
nuclear
magnetic
resonance
(
Carbon Research,
Journal Year:
2024,
Volume and Issue:
3(1)
Published: April 30, 2024
Abstract
During
freezing
periods,
nutrients
(carbon
and
organic
matter,
etc.)
are
enriched
in
the
water
sediment
of
lakes
cold-arid
regions,
leading
to
potential
algal
bloom
outbreaks
other
health
risks
ecosystem.
Particularly,
dissolved
matter
(DOM)
is
a
critical
component
plays
an
important
role
global
carbon
cycle.
However,
mechanisms
DOM
transfer
between
ice
remain
unclear.
This
study
analyzed
influence
microbial
community
on
composition
using
16
s
RNA,
3DEEM,
FT-ICR
MS
Daihai
Lake
Wuliangsuhai
Yellow
River
Basin,
China.
According
spectral
analysis,
content
endogenous
such
as
humus,
accounted
for
40%
total
water,
while
tryptophan
tyrosine
80%
ice.
The
results
mass
spectrometry
showed
that
lignin
was
main
component,
less
than
water.
Molecular
structures
seven
coexisting
lake
were
elucidated
with
adapted
Kendrick-analogous
network
visualization,
which
clearly
illustrates
long-chain
molecules
derived
from
small
molecules,
heteroatoms
complexed
side
groups.
positive
correlations
CHO,
CHNO,
CHOS,
CHOS
Actinomyces
indicate
actively
interacted
community.
44%
CHO
compounds
have
same
molecular
formula
two
closed
7%
higher
Meanwhile,
dynamically
migrate
via
interstitial
because
solubility
changes
under
transformation,
has
been
proved
by
decrease
contents
humus
tryptophan-like
substances
bottom
surface
lower
carbohydrate
unsaturated
aromatic
hydrocarbon
helps
predict
structure
during
migration
provides
scientific
basis
environmental
remediation
high
concentration
carbon.
Gases
and
dissolved
black
carbon
(DBC)
formed
during
pyrolysis
of
nitrogen-rich
feedstock
would
affect
atmospheric
aquatic
environments.
Yet,
the
mechanisms
driving
biomass
gas
evolution
DBC
formation
are
poorly
understood.
Using
thermogravimetric-Fourier
transform
infrared
spectrometry
two-dimensional
correlation
spectroscopy,
we
correlated
temperature-dependent
primary
noncondensable
release
sequence
(H2O
→
CO2
HCN,
NH3
CH4
CO)
with
specific
defunctionalization
stages
in
order:
dehydration,
decarboxylation,
denitrogenation,
demethylation,
decarbonylation.
Our
results
revealed
that
proteins
mainly
contributed
to
releases,
low-volatile
pyrolytic
products
DBC.
Combining
mass
difference
analysis
Fourier
ion
cyclotron
resonance
spectrometry,
showed
44–60%
molecular
compositions
were
gas-releasing
reactions.
Dehydration
(−H2O),
lower
reaction
energy
barrier,
most
at
350
450
°C,
whereas
decarboxylation
(−CO2)
deamidization
(−HCNO)
prevailed
contributing
550
°C.
The
aromaticity
changes
via
emissions
deduced.
Compared
their
precursors,
dehydration
increased
aromaticity,
while
reduced
products.
These
insights
on
byproducts
help
predict
tune
properties
changing
biochar
production,
minimizing
negative
environmental
impacts.
