Biofuels,
Год журнала:
2024,
Номер
unknown, С. 1 - 9
Опубликована: Дек. 18, 2024
This
study
investigates
the
emissions
of
formaldehyde
and
acetaldehyde,
as
well
performance
a
diesel
engine
fueled
by
various
diesel-triglyceride
diesel-biodiesel
blends.
The
biodiesels
were
synthesized
from
triglyceride
sources,
including
canola,
soybean,
palm,
coconut
oil,
beef
tallow.
Emission
analyses
conducted
using
Differential
Optical
Absorption
Spectroscopy
(DOAS).
biodiesel
was
blended
with
in
specific
proportions,
allowing
for
comparative
analysis
acetaldehyde
emissions.
Results
indicate
that
addition
triglycerides
to
fuel
leads
increased
both
exhaust,
higher
emission
levels
observed
mixtures
containing
triglycerides.
Notably,
canola
oil
exhibited
lower
values
than
other
diesel-vegetable
Similarly,
palm
demonstrated
reduced
compared
concludes
esters
can
be
effectively
combustion
engines,
benefiting
their
oxygenating
properties
enhance
performance.
However,
advantage
is
most
pronounced
mixture
proportions
up
5%
15%
biodiesel.
Sensors,
Год журнала:
2025,
Номер
25(4), С. 1129 - 1129
Опубликована: Фев. 13, 2025
Reactive
oxygen
species
(ROS)
play
an
important
role
in
atmospheric
pollution,
and
their
detection
is
essential
for
assessing
air
quality
health
risks.
This
study
developed
validated
a
standardized
methodology
using
the
BPEAnit
probe
specially
designed
particle-into-liquid
sampler,
Particle
Into
Nitroxide
Quencher
(PINQ),
to
measure
reactive
monitoring
applications.
The
method
demonstrated
high
sensitivity,
with
limit
of
0.03
nmol·m-3,
robust
linearity
(R2
=
0.9999),
negligible
system
residue,
ensuring
accurate
ROS
quantification.
Comparative
analyses
startup
conditions
revealed
superior
baseline
stability
under
cold
start
despite
longer
stabilization
time
required.
auto-oxidation
probe,
measured
at
rate
3.01
nmol·m-3
per
hour,
was
identified
as
critical
factor
long-term
monitoring,
highlighting
necessity
procedures
mitigate
drift
effect.
established
system's
suitability
urban
assessments
public
risk
evaluations,
offering
insights
into
its
limitations
operational
challenges.
Future
advancements
could
focus
on
enhancing
expanding
method's
utility
diverse
environments,
thereby
broadening
applicability
scenarios.
Environmental Science Atmospheres,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Photodegradation
alters
secondary
organic
aerosol
(SOA)
chemical
composition
and
physical
properties,
promoting
the
formation
of
oxidation
products
in
both
gas-
particle-phase
by
depleting
high-molecular-weights
species
within
SOA.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Фев. 12, 2025
Organic
films
containing
unsaturated
lipids
are
widespread,
yet
their
oxidation
pathways
with
associated
impacts
on
contaminant
lifetimes
and
human
exposure
remain
poorly
explored
under
indoor
environmental
conditions.
This
study
demonstrates
that
UVA
radiation
radical
drive
rapid
autoxidation
of
thin
methyl
linolenate
(ML)
canola
oil
(which
contains
polyunsaturated
triglycerides),
primarily
producing
organic
hydroperoxides.
For
ML
this
fast
chemistry
occurs
at
the
same
rate
entirely
dark,
genuine
conditions
as
it
does
when
exposed
to
significantly
higher
•OH
radicals
in
a
flow
reactor.
Both
detected
within
oxidized
films,
propagating
dark
environments
minimal
sensitivity
initiation
rate.
When
mixed
into
bisphenol
A
is
hydroxylated,
illustrating
potential
transformation
for
toxic
contaminants.
uncovers
insights
lipid
processes
underscores
health
impacts.
but
Here,
authors
demonstrate
oil,
Environmental Science & Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 10, 2024
Secondary
organic
aerosol
(SOA)
comprises
the
majority
of
submicron
particles
and
is
important
for
air
pollution,
health,
climate.
When
SOA
mixes
with
inorganic
containing
transition
metals
(e.g.,
Fe),
chemical
reactions
altering
physicochemical
properties
can
occur.
Here,
we
study
Fe's
impact
on
formation
composition
formed
via
dark
α-pinene
ozonolysis
either
(NH
ACS ES&T Air,
Год журнала:
2024,
Номер
1(11), С. 1333 - 1351
Опубликована: Окт. 10, 2024
Brown
carbons
(BrCs)
play
a
pivotal
role
in
the
light
absorption
by
aerosol
particulates
exerting
positive
radiative
forcing
effect
that
contributes
to
global
warming.
Beyond
impacts
on
balance,
some
BrCs,
as
photosensitizers,
can
generate
reactive
triplet-state
molecules
toward
various
atmospheric
upon
photoexcitation.
The
significance
of
photosensitization
has
been
increasingly
recognized,
particularly
context
escalated
wildfire
incidents
emit
substantial
BrCs.
We
focus
complex
discussing
current
challenges,
including
(1)
diverse
reactivities
photosensitizer
mixture
particles,
(2)
methodologies
for
investigating
processes,
(3)
driving
factors
photosensitization,
and
(4)
typical
pathways
mechanisms
photosensitized
reactions.
Lastly,
we
advise
future
research
refined
parametrization
triplet
singlet
oxygen
concentrations,
alongside
their
reactivities.
ACS Earth and Space Chemistry,
Год журнала:
2024,
Номер
8(8), С. 1623 - 1633
Опубликована: Июль 11, 2024
Laboratory
studies
have
shown
that
photolytic
mass
loss
can
be
a
significant
sink
for
secondary
organic
aerosol
(SOA).
Here,
we
use
quartz
crystal
microbalance
to
measure
of
Suwannee
River
Humic
Acid
(SRHA)
and
Fulvic
(SRFA),
surrogates
SOA,
exposed
254,
300,
405
nm
radiation
over
the
course
24
h.
We
find
rates
these
materials
are
comparable
those
laboratory-generated
limonene
toluene
SOA
material
from
study
Baboomian
et
al,
The Journal of Physical Chemistry A,
Год журнала:
2024,
Номер
128(45), С. 9792 - 9803
Опубликована: Ноя. 5, 2024
Photochemical
aging
and
photooxidation
of
atmospheric
particles
play
a
crucial
role
in
both
the
chemical
physical
processes
occurring
troposphere.
In
particular,
presence
organic
chromophores
within
aerosols
can
trigger
photosensitized
oxidation
that
drives
these
interfaces.
However,
light-induced
surface
aerosols,
especially
those
enriched
with
components,
remains
poorly
understood.
Herein,
we
present
gravimetric
vibrational
spectroscopy
study
aimed
to
investigate
nonanoic
acid
(NA),
model
system
fatty
acids
complex
photosensitizers
molecular
proxies.
Specifically,
this
shows
comparative
analysis
reactions
thin
films
containing
four
different
photosensitizers,
namely
marine
dissolved
matter
(m-DOM)
humic
(HA)
as
environmental
4-imidazolecarboxaldehyde
(4IC)
4-benzoylbenzoic
(4BBA)
All
show
predominant
acid,
important
differences
rate
yield
product
formation
depending
on
photosensitizer.
Limited
changes
were
observed
photosensitizer
itself.
Results
that,
among
examined,
4BBA
is
most
effective
photooxidizing
acid.
Overall,
work
underscores
relevance
such
environment.
