Heterogeneous Reactions of Phenol on Different Components of Mineral Dust Aerosol: Formation of Oxidized Organic and Nitro-Phenolic Compounds
ACS ES&T Air,
Journal Year:
2024,
Volume and Issue:
1(4), P. 259 - 272
Published: Feb. 23, 2024
Phenol,
a
common
semi-volatile
compound
associated
with
different
emissions
including
from
plants
and
biomass
burning,
as
well
anthropogenic
its
derivatives,
are
important
components
of
secondary
organic
aerosols
(SOAs).
Gas
aqueous
phase
reactions
phenol,
in
the
presence
photochemical
drivers,
fairly
understood.
However,
despite
observations
showing
aromatic
content
within
SOA
size
mass
increases
during
dust
episodes,
heterogeneous
phenol
mineral
dusts
poorly
In
current
study,
surface
at
gas/solid
interface
SiO2,
α-Fe2O3,
TiO2
have
been
investigated.
Whereas
reversible
adsorption
occurs
on
SiO2
surfaces,
for
both
α-Fe2O3
reacts
to
form
wide
range
OH
substituted
products.
For
surfaces
that
nitrated
by
gas-phase
nitric
acid
prior
exposure
unique
compounds
nitro-phenolic
compounds.
Moreover,
additional
chemistry
was
observed
when
adsorbed
products
were
exposed
SO2
result
formation
nitrite
nitrate
redox
SO2.
Overall,
this
study
reveals
extensive
complexity
prevalent
leading
surfaces.
Language: Английский
Diurnal Variation of Electrophilic Organic Compounds in Urban PM2.5 through Nontargeted Analyses: A Focus on Atmospheric Transformation
Environmental Science & Technology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 25, 2025
Electrophilic
compounds
belong
to
a
group
of
critical
components
fine
particulate
matter
(PM2.5)
with
significant
health
risk,
but
little
is
known
regarding
their
occurrence
and
sources
in
the
atmosphere.
In
this
study,
we
developed
nontargeted
approach
analyze
electrophilic
urban
Beijing
identified
147
ones
diurnal
variation,
among
which
oxygenated
aromatic
(OACs)
are
predominant
species.
The
discrepancy
hierarchical
clustering
analysis
atmospheric
transformation
markers,
e.g.,
9-nitroanthracene
(9NANT)
citraconic
anhydride
(CA),
PAHs,
fluoranthene
(FLT),
suggested
potential
secondary
formation
pathway
isomeric
ratio
acephenanthrylene
(ACP)
FLT,
product-to-precursor
11H-benzo[a]fluorene-11-one
(BaFO)
further
demonstrated
prevailing
existence
oxidation.
relationship
between
night-to-day
variation
molecular
characteristics,
particularly
negative
correlation
oxygen-related
features
such
as
carbon
oxidation
state,
confirmed
that
multigenerational
processes
during
daytime
predominantly
drive
diurnal/nocturnal
differences.
This
study
achieved
systematic
identification
atmosphere,
revealing
pivotal
role
on
fate
organic
chemicals
resulted
variation.
Language: Английский
Enhanced Organic Aerosol Formation Induced by Inorganic Aerosol Formed in Laboratory Photochemical Experiments
Journal of Aerosol Science,
Journal Year:
2024,
Volume and Issue:
unknown, P. 106481 - 106481
Published: Oct. 1, 2024
Language: Английский
Challenges in Observation of Ultrafine Particles: Addressing Estimation Miscalculations and the Necessity of Temporal Trends
Tzu-Chi Lin,
No information about this author
Pei-Te Chiueh,
No information about this author
Ta-Chih Hsiao
No information about this author
et al.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 13, 2024
Ultrafine
particles
(UFPs)
pose
a
significant
health
risk,
making
comprehensive
assessment
essential.
The
influence
of
emission
sources
on
particle
concentrations
is
not
only
constrained
by
meteorological
conditions
but
often
intertwined
with
them,
it
challenging
to
separate
these
effects.
This
study
utilized
valuable
long-term
number
and
size
distribution
(PNSD)
data
from
2018
2023
develop
tree-based
machine
learning
model
enhanced
an
interpretable
component,
incorporating
temporal
markers
characterize
background
or
time
series
residuals.
Our
results
demonstrated
that,
differing
PM
Language: Английский