Toxics,
Год журнала:
2024,
Номер
12(11), С. 787 - 787
Опубликована: Окт. 29, 2024
Volatile
organic
compounds
(VOCs)
are
ubiquitous
in
the
atmosphere,
posing
significant
adverse
impacts
on
air
quality
and
human
health.
However,
current
research
atmospheric
VOCs
mainly
focuses
specific
regions
or
industries,
without
comprehensive
national-level
analysis.
In
this
study,
a
total
of
99
articles
China
published
from
2015
to
2024
were
screened,
data
their
concentrations,
source
apportionment,
health
risks
extracted
summarized.
The
results
revealed
that
annual
average
concentrations
TVOCs
groups
generally
increased
then
decreased
between
2011
2022,
peaking
2018-2019.
A
distinct
seasonal
pattern
was
observed,
with
highest
occurring
winter,
followed
by
autumn,
spring,
summer.
TVOC
emissions
highly
concentrated
northern
eastern
China,
contributed
alkanes
alkenes.
Source
apportionment
indicated
vehicle
sources
(32.9%
±
14.3%),
industrial
(18.0%
12.8%),
other
combustion
(13.0%
13.0%)
primary
China.
There
positive
correlation
(
Atmospheric Environment X,
Год журнала:
2024,
Номер
21, С. 100236 - 100236
Опубликована: Янв. 1, 2024
The
petrochemical
industry
is
one
of
the
main
sources
industrial
volatile
organic
compounds
(VOCs)
emissions.
In
this
study,
typical
refining
enterprises
in
Southeast
China
were
selected,
direct
testing
VOCs
18
processes,
and
87
samples
obtained
using
different
on-site
sampling
methods,
such
as
stack,
fugitive,
static
dynamic
sealing
point
emissions
based
on
key
process
units,
tank
areas,
loading
unloading
plant
boundaries
industry.
Simultaneously,
concentration
laboratory
analysis
115
conducted.
Our
findings
reveal
that,
although
overall
emission
profile
predominantly
consists
low-carbon
alkanes
alkenes,
with
relatively
minimal
halogenated
hydrocarbon
VOC
emissions,
there
are
substantial
discrepancies
primary
species
across
stages.
mass
percentages
alkanes,
aromatics,
hydrocarbons,
oxygenated
units
55
±
27%,
8.5
15%,
23
3.9
4.3%,
10
8.4%,
respectively.
dominant
atmospheric
vents
depropanizer,
light
recovery
unit,
continuous
reforming
catalytic
cracking
sulfur
unit
n-butane
(15%),
n-hexane
(13%),
propane
(21%),
propylene
(26%),
ethylene
(28%),
gasoline
top
source
was
isopentane
(48%),
while
that
area
methyl
tert-butyl
ether
(19%).
High-carbon
n-decane,
n-octane,
n-heptane
(>5%
fractions)
prominent
kerosene
tops.
Furthermore,
results
chemical
reactivity
assessment
indicate
during
well
production
process,
should
be
managed
to
mitigate
ozone
formation
potential.
According
cancer
risk
assessments,
benzene
factor
increased
risk,
its
levels
far
beyond
accepted
cutoff
point.
The
petrochemical
industry
is
one
of
the
main
sources
industrial
volatile
organic
compounds
(VOCs)
emissions.
In
this
study,
typical
refining
enterprises
in
Southeast
China
were
selected,
and
87
samples
obtained
using
different
on-site
sampling
methods,
such
as
stack,
fugitive,
static,
dynamic
sealing
point
emissions
based
on
key
process
units,
tank
areas,
loading
unloading
plant
boundaries
industry.
Simultaneously,
concentration
analyses
laboratory
115
VOCs
conducted.
Our
findings
reveal
that,
although
overall
emission
profile
predominantly
consists
low-carbon
alkanes
alkenes,
with
relatively
minimal
halogenated
hydrocarbon
VOC
emissions,
there
are
substantial
discrepancies
primary
species
across
stages.
mass
percentages
alkanes,
aromatics,
hydrocarbons,
oxygenated
units
55
±
27%,
8.5
15%,
23
3.9
4.3%,
10
8.4%,
respectively.
dominant
atmospheric
vents
depropanizer,
light
recovery
unit,
continuous
reforming
catalytic
cracking
sulfur
unit
n-butane
(15%),
n-hexane
(13%),
propane
(21%),
propylene
(26%),
ethylene
(28%),
gasoline
top
source
was
isopentane
(48%),
while
that
area
methyl
tert-butyl
ether
(19%).
High-carbon
n-decane,
n-octane,
n-heptane
(>5%
fractions)
prominent
kerosene
tops.
addition.
chemical
reactivity
assessment
results
show
from
production,
loading,
should
be
managed
to
decrease
ozone
formation
potential.
According
cancer
risk
assessments,
benzene
factor
increased
risk,
its
levels
far
beyond
accepted
cutoff
point.
Water Environment Research,
Год журнала:
2024,
Номер
96(4)
Опубликована: Апрель 1, 2024
Increasing
water
pollution
due
to
anthropogenic
activities
prompts
the
quest
for
an
effective
treatment
method.
Polymeric
materials
have
gained
attention
as
adsorbents
purification.
Membranes
are
majorly
made
from
homopolymeric
materials.
However,
recent
studies
focused
on
using
copolymeric
improved
performance.
In
this
review,
basics
of
copolymerization
including
various
types
copolymers,
synthetic
approaches,
and
their
applications
in
pollutants
removal
discussed
detail.
Advances
technology
adsorbent/membranes
last
4
years
covered
with
insights
into
future
outlook
areas
improvement
terms
copolymer
composites
treatment.
Studies
literature
did
not
only
reveal
effectiveness
a
flocculant/antifouling
selective
toxic
metals,
oil,
microbes
but
also
demonstrated
recyclability
sorbents/membrane.
Full
exploration
unique
textural
structural
properties
could
lead
great
advancement
process.
PRACTITIONER
POINTS:
The
methods
discussed.
Application
is
presented.
Recent
advances
show
good
organics.
Copolymer
potential
use
processes.
Journal of Geophysical Research Atmospheres,
Год журнала:
2024,
Номер
129(11)
Опубликована: Июнь 1, 2024
Abstract
The
formation
of
secondary
organic
aerosol
(SOA)
is
inextricably
linked
to
the
photo‐oxidation
aromatic
hydrocarbons.
However,
models
still
exhibit
biases
in
representing
SOA
mass
and
chemical
composition.
We
implemented
a
box
model
coupled
with
near‐explicit
photochemical
mechanism,
Master
Chemical
Mechanism
(MCMv3.3.1),
simulate
series
chamber
studies
assess
simulating
from
representative
monocyclic
hydrocarbons,
that
is,
toluene
three
xylene
isomers
(TX
SOA).
underpredicted
yields
xylenes
by
4.7%–100%,
which
could
be
improved
adjusting
saturation
vapor
pressure
(SVP)
their
oxidation
products.
After
updating
SVP
values,
concentration
TX
Yangtze
River
Delta
region
during
summer
doubled,
there
was
also
an
approximate
3%
enhancement
total
SOA.
Compared
lumped
mechanism
used
for
SOA,
MCM
predicted
comparable
concentrations
but
exhibited
different
volatility
distributions
states.
Toxics,
Год журнала:
2024,
Номер
12(7), С. 525 - 525
Опубликована: Июль 22, 2024
Transmission
electron
microscopy
was
used
to
analyze
individual
aerosol
particles
collected
in
Lanzhou
(urban
site)
and
its
surrounding
areas
(rural
early
2023.
The
results
revealed
that
from
the
pre-Spring
Festival
period
Spring
period,
main
pollutants
at
urban
site
decreased
significantly,
while
PM
Toxics,
Год журнала:
2024,
Номер
12(11), С. 787 - 787
Опубликована: Окт. 29, 2024
Volatile
organic
compounds
(VOCs)
are
ubiquitous
in
the
atmosphere,
posing
significant
adverse
impacts
on
air
quality
and
human
health.
However,
current
research
atmospheric
VOCs
mainly
focuses
specific
regions
or
industries,
without
comprehensive
national-level
analysis.
In
this
study,
a
total
of
99
articles
China
published
from
2015
to
2024
were
screened,
data
their
concentrations,
source
apportionment,
health
risks
extracted
summarized.
The
results
revealed
that
annual
average
concentrations
TVOCs
groups
generally
increased
then
decreased
between
2011
2022,
peaking
2018-2019.
A
distinct
seasonal
pattern
was
observed,
with
highest
occurring
winter,
followed
by
autumn,
spring,
summer.
TVOC
emissions
highly
concentrated
northern
eastern
China,
contributed
alkanes
alkenes.
Source
apportionment
indicated
vehicle
sources
(32.9%
±
14.3%),
industrial
(18.0%
12.8%),
other
combustion
(13.0%
13.0%)
primary
China.
There
positive
correlation
(
