Journal of Geophysical Research Atmospheres,
Journal Year:
2023,
Volume and Issue:
128(24)
Published: Dec. 12, 2023
Abstract
Mineral
dust
is
one
of
the
most
abundant
types
ice
nucleating
particles
in
atmosphere.
During
atmospheric
transport,
mineral
can
become
coated
with
inorganic
and
organic
solutes,
which
impact
their
nucleation
activity.
Aminium
cations
formed
from
amines
are
type
solute
that
coat
atmosphere,
but
effects
on
activity
have
not
been
studied.
We
investigated
primary,
secondary,
tertiary
aminium
methyl
ethyl
groups,
as
well
ammonium
cations,
K‐feldspar,
an
important
dust,
immersion
freezing
mode
at
low
cation
concentrations
(0.2–20
mM)
using
a
droplet‐freezing
apparatus.
Ammonium
substantially
increased
consistent
previous
studies.
In
contrast,
primary
significantly
reduced
K‐feldspar
activity,
secondary
had
no
significant
effect
(the
was
less
than
uncertainty
our
measurements).
Our
combined
results
following
mechanisms:
undergo
ion
exchange
providing
exposed
N–H
groups
for
hydrogen
bonding
ice;
exposing
hydrophobic
tail
effective
do
due
to
steric
caused
by
multiple
cation.
Analytical Sciences,
Journal Year:
2024,
Volume and Issue:
40(10), P. 1907 - 1918
Published: July 5, 2024
Sampling
and
chromatography-mass
spectrometry
methods
were
investigated
to
measure
atmospheric
amines
aminoamides.
Amines
their
amide
derivatives
play
significant
roles
in
new
particle
formation
(NPF)
the
atmosphere,
especially
diamines
aminoamides
have
higher
NPF
potentials
compared
monoamines.
For
amine
sampling,
silica
gel
tube
collection
formic
acid
extraction
gave
good
overall
recoveries
(>93
±
8%)
for
mono-,
di-,
tri-,
tetramines,
Two
chromatography
subjected
analyze
extracted
amines.
One
involved
direct
analysis
using
hydrophilic
interaction
liquid
with
carboxyl
or
diol
group
functioned
separation
column
(carboxyl-HILIC
diol-HILIC),
other
utilized
derivatization
4-(N,N-dimethylaminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole
(DBD-F)
subsequent
reversed-phase
(HPLC).
Separated
detected
by
electrospray
ionization
tandem
mass
both
cases.
DBD-F-HPLC
method
provided
sensitivity
mono-
all
polyamines
(limit
of
detection
(LOD)
<
4.6
nM,
relative
standard
deviation
(RSD)
100
nM
9.2%).
However,
could
not
be
DBD-F-HPLC.
Carboxyl-HILIC
sensitivities
(LOD
1.6
RSD
4.8%).
Forest
air
measurement
was
performed
data
obtained
carboxyl-HILIC
showed
agreement
1,3-diaminopropane,
1,4-diaminobutane
(putrescine)
1,5-diaminopentane
(cadaverine)
(R
Aminiums
are
significant
components
of
organic
aerosols
with
intense
research
on
aliphatic
aminiums.
However,
the
mechanisms
formation
aromatic
aminiums
in
urban
remain
elusive.
Highly
time-resolved
PM2.5
samples
were
collected
center
Shanghai
(China)
during
winter
to
investigate
origin
and
The
dominant
aminium
groups
(mainly
dimethylaminium
monomethylaminium).
Anilinium
was
third
most
abundant
aminium.
concentrations
anilinium
total
showed
higher
levels
daytime
weekdays.
This
finding
combined
source
apportionment
analysis
suggested
that
daily
weekly
scale
variations
anthropogenic
activities
(e.g.,
traffic
for
commuting)
mainly
responsible
fluctuations
(particularly
aminiums).
acid
dependence
significantly
stronger
than
formation.
Aliphatic
negatively
positively
correlated
ozone,
respectively,
suggesting
oxidative
processes
weakened
abundance
but
promoted
molecular
characterization
atmospheric
degradation
higher-molecular-weight
amine
compounds
an
important
mechanism
aerosols.
Thus,
this
study
provides
novel
insights
into
ChemistrySelect,
Journal Year:
2024,
Volume and Issue:
9(3)
Published: Jan. 16, 2024
Abstract
N
‐alkyl
anilines
are
a
series
of
common
and
versatile
compounds
which
not
only
have
been
used
as
reaction
solvents,
acid‐accepters,
organic‐bases,
but
also
in
synthesis
dyes,
pharmaceuticals,
anti‐colodal.
The
‐methyl
and/or
,
‐dimethyl
the
most
representative
ones
among
these.
Due
to
their
widespread
uses,
numerous
works
reported
on
synthetic
strategies
past
decades.
studies
N−H
methylations
mainly
focus
selection
reagents,
catalysts,
or
ligands
design.
Different
transition‐metals,
e.
g.,
Ir,
Ru,
Pd,
et.
al,
with
different
methylation
protocols.
Methanol
(CH
3
OH),
carbon
dioxide
(CO
2
),
formaldehyde
(HCHO),
dimethyl
carbonate
((CH
)
CO
was
C
source,
hydrogen
(H
silanes
H
source.
In
this
work,
we
would
like
summarize
latest
advances
(
included)
derivatives.
This
review
provides
an
overview
reactants
catalyst,
well
emphasis
scope
substrates
proposed
mechanism
for
each
work.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(12), P. 5453 - 5460
Published: March 13, 2024
Many
types
of
living
plants
release
gaseous
trimethylamine
(TMA),
making
it
a
potentially
important
contributor
to
new
particle
formation
(NPF)
in
remote
areas.
However,
panoramic
view
the
importance
forest
biogenic
TMA
at
regional
scale
is
lacking.
Here,
we
pioneered
nationwide
mobile
measurements
across
transect
contiguous
farmland
eastern
China
and
subtropical
forests
southern
China.
In
contrast
route,
concentrations
measured
during
route
correlated
significantly
with
isoprene,
suggesting
potential
emissions
from
leaves.
Our
high
time-resolved
obtained
weak
photo-oxidizing
atmosphere
reflected
freshly
emitted
TMA,
indicating
highest
emission
intensity
irrigated
dryland
(set
as
baseline
10),
followed
by
paddy
field
(7.1),
evergreen
(5.9),
broadleaf
mixed
(4.3).
Extrapolating
their
proportions
roughly
China,
alone,
which
constitute
half
total
area,
account
for
nearly
70%
nation's
farmland.
estimates,
despite
uncertainties,
take
first
step
toward
large-scale
assessment
amines,
highlighting
need
observational
modeling
studies
consider
this
hitherto
overlooked
source
TMA.
Aerosol Science and Technology,
Journal Year:
2024,
Volume and Issue:
58(4), P. 440 - 460
Published: April 2, 2024
The
protonation
state
of
organic
acids
and
bases
in
aqueous
aerosols
has
the
potential
to
impact
cloud
activating
properties
by
altering
H+
concentrations,
consequently
aerosol
chemistry
water
activity,
but
is
currently
overlooked
most
atmospheric
models.
We
investigated
acid–base
dissociation
on
droplet
number
concentration
short-wave
radiative
effect
from
formation
environments
with
varying
incorporating
into
aerosol–chemistry–climate
box
model
ECHAM6.3–HAM2.3.
degree
previously
been
observed
for
several
organics
Brönsted
acid
or
base
character
be
significantly
modified
surface,
compared
bulk
solution.
introduced
an
empirical
account
this
mechanism
both
explore
further
climate
effects.
Suwanee
River
Fulvic
decanoic
were
used
as
examples
acidic
tributylamine
n-butylamine
bases.
Our
results
show
that
accounting
equilibria
components,
their
possible
surface
modulation,
enhanced
a
substantial
clouds,
pristine,
clean,
well
polluted
environments.
leads
concentrations
aerosol,
which
influences
sulfur
drastically
increase
sulfate
mass
whole
population.
increased
contributes
rise
particles
within
larger
size
ranges,
thereby
increasing
concentrations.
In
addition,
amounts
ions
resulting
amount
available
solute
leading
higher
condensation
nuclei,
droplets.
smaller
than
all
modulation
largest
clean
These
emphasize
importance
aerosol-cloud-climate
consideration
models
regional
global
scales.
