Abstract.
Atmospheric
humic-like
substances
(HULIS)
affect
global
radiation
balance
due
to
its
strong
light
absorption
at
the
ultraviolet
wavelength.
The
potential
sources
and
molecular
compositions
of
water
soluble
HULIS
a
suburb
site
Yangtze
River
Delta
from
2017
2018
were
discussed
based
on
radiocarbon
(14C)
analysis
combining
Fourier
Transform
Ion
Cyclotron
Resonance
Mass
Spectrometry
(FT-ICR
MS)
technique
in
this
study.
14C
results
showed
that
averaged
non-fossil
source
contributions
39
±
8
%
36
6
summer
winter,
respectively,
indicating
both
fossil
played
important
roles
formation
HULIS.
Van
Krevelen
diagrams
obtained
FT-ICR
MS
proportions
tannins-like
carbohydrates-like
groups
higher
summer,
suggesting
significant
contribution
biogenic
secondary
organic
aerosols
(SOA).
condensed
aromatic
structures
winter
suggested
increasing
anthropogenic
emissions.
Molecular
composition
CHO,
CHON,
CHOS,
CHONS
subgroups
relatively
intensities
high
O-containing
macromolecular
oligomers
CHO
compounds
further
stronger
SOA
summer.
High-intensity
phenolic
flavonoids
which
related
biomass
burning
polycyclic
hydrocarbons
(PAHs)
derivatives
fuel
combustion
emissions
found
compounds.
Besides,
two
high-intensity
containing
ring
(C9H6O7
C10H5O8)
identified
samples
similar
those
off-road
engine
samples,
traffic
emission
was
one
study
site.
CHON
mainly
composed
organonitrates
or
nitro
with
associated
enhanced
NOx
winter.
However,
formulas
referring
N-heterocyclic
compounds,
produced
atmospheric
processes
involving
reduced
N
species
(e.g.,
ammonium).
S-containing
organosulfates
(OSs)
derived
precursors,
long-chain
alkane
hydrocarbon,
illustrating
mixed
These
findings
add
our
understanding
interaction
between
Atmospheric chemistry and physics,
Год журнала:
2023,
Номер
23(14), С. 8305 - 8324
Опубликована: Июль 25, 2023
Abstract.
Atmospheric
humic-like
substances
(HULIS)
affect
the
global
radiation
balance
due
to
their
strong
light
absorption
at
ultraviolet
wavelength.
The
potential
sources
and
molecular
compositions
of
water-soluble
HULIS
a
suburban
site
in
Yangtze
River
Delta
from
2017
2018
were
discussed,
based
on
results
radiocarbon
(14C)
analysis
combining
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
(FT-ICR-MS)
technique
this
study.
14C
showed
that
averaged
non-fossil-fuel
source
contributions
39
±
8
%
36
6
summer
winter,
respectively,
indicating
significant
fossil
fuel
HULIS.
Van
Krevelen
diagrams
obtained
FT-ICR-MS
proportions
tannin-like
carbohydrate-like
groups
higher
summer,
suggesting
contribution
biogenic
secondary
organic
aerosols
(SOAs).
condensed
aromatic
structures
winter
suggested
increasing
anthropogenic
emissions.
Molecular
composition
CHO,
CHON,
CHOS,
CHONS
subgroups
relatively
intensities
high
O-containing
macromolecular
oligomers
CHO
compounds
further
stronger
SOA
formation
summer.
High-intensity
phenolic
flavonoids,
which
related
biomass
burning
polycyclic
hydrocarbon
(PAH)
derivatives
combustion
emissions,
found
compounds.
Besides,
two
high-intensity
containing
ring
(C9H6O7
C10H5O8)
identified
samples
similar
those
off-road
engine
samples,
traffic
emissions
one
important
study
site.
CHON
mainly
composed
nitro
or
organonitrates
with
significantly
associated
addition
enhanced
NOx
winter.
However,
formulas
referring
N-heterocyclic
compounds,
produced
atmospheric
processes
involving
reduced
N
species
(e.g.,
ammonium).
S-containing
organosulfates
(OSs)
derived
precursors,
namely
long-chain
alkane
hydrocarbon,
illustrate
mixed
Generally,
different
policies
need
be
considered
for
each
season
seasonal
(i.e.,
sources,
both
seasons,
additional
coal
winter).
Measures
control
motor
vehicles
industrial
Additional
measures
power
plants
should
applied
These
findings
add
our
understanding
interaction
between
ACS Earth and Space Chemistry,
Год журнала:
2023,
Номер
7(12), С. 2498 - 2510
Опубликована: Дек. 11, 2023
Detailed
chemical
characterization
of
biomass
burning
organic
aerosol
(OA)
was
performed
using
a
synergistic
combination
multimodal
mass
spectrometry
techniques.
OA
analyzed
in
situ
high-resolution
time-of-flight
spectrometer
(HR-ToF-AMS)
and
an
extractive
electrospray
ionization
(EESI-MS)
deployed
onboard
the
NASA
DC-8
research
aircraft.
Additionally,
complementary
filter
samples
were
collected
for
offline
laboratory
analysis
high-performance
liquid
chromatography
interfaced
with
photodiode
array
(HPLC-PDA-HRMS).
During
flight
on
August
3,
2019,
which
focused
Williams
Flats
Fire,
WA,
HR-ToF-AMS
data
revealed
abundant
presence
sulfur
(OS)
species
as
prominent
components
OA.
These
OS
identified
based
their
unique
fragmentation.
Further
investigation
HPLC-PDA-HRMS
MSn
fragmentation
allowed
us
to
identify
molecular
characteristics
these
unusual
species.
The
dominant
compounds
detected
during
found
be
alkylbenzene
sulfonates.
Organosulfate,
nitroaromatic,
oxygenated
aromatic
also
identified.
Guided
by
HRMS
results,
time-resolved
aging
profiles
selected
individual
retrieved
from
real-time
EESI-MS
sets
evaluate
evolution
emission
plume.
Notably,
sulfonate
showed
remarkable
stability
over
8
h
atmospheric
transport.
In
contrast,
common
organosulfates
displayed
short
apparent
half-life
times
that
low
1.2
h,
indicating
susceptibility
aging.
nitroaromatic
exhibited
relatively
slower
aging,
average
1.8
2.2
respectively.
Journal of Geophysical Research Atmospheres,
Год журнала:
2025,
Номер
130(7)
Опубликована: Март 28, 2025
Abstract
Atmospheric
organosulfur
species
(OrgS)
were
investigated
at
four
different
sites
(urban,
rural,
forest,
and
remote
mountain)
in
the
Guanzhong
basin
of
northwest
China
to
probe
their
chemical
diversity
distribution
profiles.
The
organic
molecular
composition
ambient
PM
2.5
samples
was
measured
using
an
ultrahigh
performance
liquid
chromatograph
coupled
with
electrospray
ionization
Orbitrap
high‐resolution
mass
spectrometer.
We
found
that
OrgS
(including
CHOS
CHONS
herein)
ubiquitously
present
across
these
environments
predominated
number
assigned
negative
mode.
fractions
(mean
41%–45%)
total
over
upper
range
compared
those
worldwide
areas
(12%–37%),
primarily
attributing
high
levels
anthropogenic
pollutants
(SO
2
,
NO
x
sulfate,
etc.)
this
region.
Organosulfates
nitrooxy‐organosulfates
aliphatic‐like
structures
from
long‐chain
alkanes
biogenic
precursors
constituted
a
majority
OrgS,
yet
distinct
characteristics
each
environment.
carbon
atoms
molecules
revealed
mainly
originated
complex
mixed
sources
urban
site,
whereas
more
prevalent
non‐urban
sites.
production
resulted
synergistic
interactions
multiple
influencing
factors
conditions.
Our
results
highlight
importance
pollution
modifying
aerosol
under
various
atmospheric
environments.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Май 1, 2025
Organosulfates
are
key
compounds
driving
the
anthropogenic
enhancement
of
ambient
organic
aerosol,
however,
total
organosulfate
quantification
remains
elusive
due
to
their
molecular
diversity
and
scarcity
authentic
standards.
Here,
we
present
a
solid-phase
extraction
method
that
isolates
organosulfates
from
aerosol
samples
enables
identification
using
mass
spectrometry
charged
detector,
respectively.
We
investigate
urban
China
rural
Germany
quantify
~130
~65
chromatographically
resolved
organosulfates,
respectively,
contributing
less
than
~2%
matter.
find
significantly
larger
fraction
appearing
as
broad
peak
in
chromatograms
detector.
Confirming
its
origin
non-resolved
an
all-ion
fragmentation
experiment
reveals
specific
sulfate-related
ions.
Integrating
this
peak,
contribution
is
12-17%
~21%
Germany,
These
findings
emphasise
potential
sulfur
emission
reduction
for
mitigating
both
pollution.
Atmospheric Environment,
Год журнала:
2023,
Номер
298, С. 119634 - 119634
Опубликована: Фев. 2, 2023
This
work
presents
a
thorough
analysis
of
PM10
speciated
organic
composition
at
Sanabria
Lake
Natural
Park,
rural
remote
area
in
NW-Spain,
including
diacids,
hydroxy
and
poliacids,
fatty
acids,
alkenoic
sugars,
sugar
alcohols,
n-alkanes,
PAHs,
quinones,
hopanes,
tracers
biomass
burning,
biogenic
secondary
aerosol
(BSOA)
from
isoprene
α-pinene.
ambient
concentrations
(mean
value
12.2
μg
m−3)
were
within
the
typical
range
registered
regional-background
air
quality
monitoring
stations
Spain.
However,
occurrence
African
dust
outbreaks
burning
events
produced
significant
increases
levels
this
site
(daily
mean
29.2
m−3
13.7
m−3,
respectively).
Major
compounds
levoglucosan,
sacharides
2-methyltetrols,
markers
for
soil
BSOA
respectively.
SOA
contributed
more
than
53%
total
measured
organics
summer
Samples
with
high
include
most
events,
suggesting
that
might
promote
formation
oxygenated
species
such
as
derivatives
area.
contribution
decreased
to
14%
winter.
Biomass
represented
37%
analysed
pollutants
winter,
indicating
is
main
source
colder
seasons,
mainly
due
influence
regional
use
fuel
domestic
heating.
Hence,
fact
are
likely
become
increasingly
frequent
context
climate
change
makes
type
particularly
relevant
assessing
their
impact
on
natural
protected
areas.
