From Quencher to Promoter: Revisiting the Role of 2,4,6-Trimethylphenol (TMP) in Triplet-State Photochemistry of Dissolved Organic Matter
Environmental Science & Technology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 25, 2025
Triplet-state
dissolved
organic
matter
(3DOM*)
plays
a
crucial
role
in
environmental
aquatic
photochemistry,
with
2,4,6-trimethylphenol
(TMP)
frequently
used
as
chemical
probe
or
quencher
due
to
its
high
reactivity
3DOM*.
However,
the
influence
of
TMP-derived
oxidation
intermediates
on
target
photochemical
reactions
has
not
been
comprehensively
examined.
This
study
investigated
TMP's
effect
photolysis
sulfamethoxazole
(SMX),
common
antibiotic
found
natural
waters,
presence
different
DOM
sources
model
photosensitizer.
Contrary
expectation,
TMP
significantly
accelerated
SMX
photolysis,
extent
enhancement
depending
and
concentrations.
Laser
flash
kinetic
modeling
suggested
long-lived
reactive
species
(TMP-RS),
including
phenoxyl
radicals,
semiquinone
quinones,
key
factors
this
process.
Unlike
3DOM*,
TMP-RS
may
react
formation
non-SMX•+
intermediates.
process
prevents
reduction
SMX•+
subsequent
regeneration
SMX.
The
successfully
predicts
dynamic
contributions
various
during
reaction,
highlighting
critical
TMP-RS.
advances
our
understanding
involvement
triplet-state
photochemistry
suggests
reconsideration
RSs
play
transformation
micropollutants.
Language: Английский
Photolytic Transformation of Trace Organic Compounds: Roles of Direct Photolysis and Indirect Photolysis by Singlet Oxygen
Water Research,
Journal Year:
2025,
Volume and Issue:
unknown, P. 123799 - 123799
Published: May 1, 2025
Language: Английский
Aerosolized algal bloom toxins are not inert
Environmental Science Atmospheres,
Journal Year:
2024,
Volume and Issue:
4(10), P. 1113 - 1128
Published: Jan. 1, 2024
Harmful
algal
blooms
(HABs)
are
projected
to
become
increasingly
prevalent,
extending
over
longer
periods
and
wider
geographic
regions
due
the
warming
surface
ocean
water
other
environmental
factors,
including
but
not
limited
nutrient
concentrations
runoff
for
marine
freshwater
environments.
Incidents
of
respiratory
distress
linked
inhalation
aerosols
containing
HAB
toxins
have
been
documented,
though
risk
is
typically
associated
with
original
toxins.
However,
aerosolized
in
micrometer
submicrometer
particles
vulnerable
atmospheric
processing.
This
processing
can
potentially
degrade
produce
byproducts
varying
potencies
compared
parent
The
toxins,
especially
conjunction
co-morbid
factors
such
as
exposure
air
pollutants
from
increased
commercial
activities
ports,
may
represent
a
significant
pathway
considerable
portion
global
population.
Understanding
chemistry
behind
transformation
these
enhance
public
protection
by
improving
existing
alert
systems.
Language: Английский