Molecules,
Journal Year:
2023,
Volume and Issue:
28(2), P. 777 - 777
Published: Jan. 12, 2023
In
this
work,
we
employed
EEM-PARAFAC
(fluorescence
excitation-emission
matrices-parallel
factor
analysis)
as
a
low-cost
tool
to
study
the
oxidation
pathways
of
(fluoro)quinolones.
Amounts
12.5
μM
enrofloxacin
(ENR),
ciprofloxacin
(CIP),
ofloxacin
(OFL),
oxolinic
acid
(OA),
and
flumequine
(FLU),
individual
solutions,
were
irradiated
under
UVA
light.
A
5-component
PARAFAC
model
was
obtained,
four
them
related
parent
pollutants,
named
ENR-like
(including
CIP),
OFL-like,
OA-like,
FLU-like,
an
additional
one
photoproducts,
called
ENRox-like
(with
emission
red-shift
with
respect
component).
Mass
spectrometry
correlate
five
components
their
plausible
molecular
structures.
Results
indicated
that
photoproducts
presenting:
(i)
hydroxylation
or
alkyl
cleavages
exhibited
fingerprints
analogous
those
pollutants;
(ii)
defluorination
emitted
within
region;
(iii)
aforementioned
changes
plus
piperazine
ring
cleavage
OA-like
region.
Afterwards,
antibiotics
mixed
in
single
solution
(each
at
concentration
0.25
μM)
seawater,
being
also
able
deconvolute
fingerprint
humic-like
substances.
This
approach
could
be
potential
game
changer
analysis
(fluorescent)
contaminants
emerging
concern
removals
complex
matrices,
giving
rapid
visual
insights
into
degradation
pathways.
The Science of The Total Environment,
Journal Year:
2022,
Volume and Issue:
858, P. 159699 - 159699
Published: Oct. 26, 2022
Reduced
atmospheric
acid
deposition
has
given
rise
to
recovery
from
acidification
–
defined
as
increasing
pH,
neutralization
capacity
(ANC),
or
alkalinity
in
surface
waters.
Strong
evidence
of
been
reported
across
North
America
and
Europe,
driving
chemical
responses.
The
primary
responses
identified
this
review
were
concentration
changing
character
natural
organic
matter
(NOM)
towards
predominantly
hydrophobic
nature.
NOM
also
influenced
trace
metal
cycling
many
browning
waters
increases
Fe
Al.
Further,
climate
change
other
factors
(e.g.,
land
use)
act
concert
with
reductions
contribute
widespread
will
have
a
more
pronounced
effect
stabilizes.
observed
water
quality
trends
presented
challenges
for
drinking
treatment
increased
dosing,
poor
filter
operations,
formation
disinfection
by-products)
facilities
may
be
under
designed
result.
This
comprehensive
key
research
areas
addressed,
including
1)
need
monitoring
programs
larger
timescales;
consistency
measurements)
assess
impacts
on
dynamics,
2)
better
understanding
vulnerabilities
the
transition
robust
technologies
solutions
that
can
adapt
drivers
quality.
Applied Spectroscopy Reviews,
Journal Year:
2023,
Volume and Issue:
59(4), P. 423 - 482
Published: May 5, 2023
In
recent
years,
spectral
analysis
methods
have
developed
rapidly.
A
key
feature
is
the
use
of
chemometric
to
process
data
for
performing
qualitative
and
quantitative
complex
mixtures.
The
coupling
spectroscopic
techniques
led
distinct
advantages
in
speed,
cost,
efficiency,
automation,
portability
compared
traditional
agriculture,
food,
pharmaceutical,
petroleum,
chemical,
environmental,
medical
fields.
This
paper
comments
on
review
papers
published
during
past
three
years
(2020–2022)
topic
combination
methods.
development
status,
existing
challenges,
future
direction
this
field
discussed.
ACS ES&T Water,
Journal Year:
2023,
Volume and Issue:
3(8), P. 1997 - 2008
Published: June 12, 2023
Disinfection
byproduct
(DBP)
formation,
prediction,
and
minimization
are
critical
challenges
facing
the
drinking
water
treatment
industry
worldwide
where
chemical
disinfection
is
required
to
inactivate
pathogenic
microorganisms.
Fluorescence
excitation–emission
matrices-parallel
factor
analysis
(EEM-PARAFAC)
used
characterize
quantify
fluorescent
dissolved
organic
matter
(FDOM)
components
in
aquatic
systems
may
offer
considerable
promise
as
a
low-cost
optical
surrogate
for
DBP
formation
treated
waters.
However,
global
utility
of
this
approach
quantification
prediction
specific
classes
or
species
has
not
been
widely
explored
date.
Hence,
review
aims
elucidate
recurring
empirical
relationships
between
common
environmental
fluorophores
(identified
by
PARAFAC)
concentrations
produced
during
disinfection.
From
45
selected
peer-reviewed
articles,
218
statistically
significant
linear
(R2
≥
0.5)
with
one
more
were
established.
Trihalomethanes
(THMs)
haloacetic
acids
(HAAs),
key
regulated
classes,
extensively
investigated
exhibited
strong,
recurrent
ubiquitous
humic/fulvic-like
FDOM
components,
highlighting
their
potential
surrogates
carbonaceous
formation.
Conversely,
observed
nitrogenous
such
haloacetonitriles
(HANs),
halonitromethanes
(HNMs),
N-nitrosamines
(NAs),
PARAFAC
ambiguous,
but
preferential
protein-like
case
algal/microbial
sources
noted.
This
highlights
transposing
site-specific
source-specific
component
model.
Environmental Technology & Innovation,
Journal Year:
2023,
Volume and Issue:
32, P. 103271 - 103271
Published: July 10, 2023
The
primary
aim
of
this
study
was
to
conduct
a
comparative
analysis
four
distinct
biochar
types,
which
were
derived
from
wood
residues
through
varied
production
methods.
To
assess
their
efficacy
in
removing
dissolved
organic
matter
(DOM)
bio-treated
wastewater,
examines
the
capacity
these
biochars
extract
DOM
fractions
wastewater
sourced
landfill
leachate.
Three
types
raw
gasification
,
and
activated
with
H2O
CO2
respectively.
other
one
pyrolytic
produced
residues.
evaluate
biochars’
performance
removal,
various
components
analyzed.
found
that
method
significantly
impacted
ability
remove
while
activation
technique
showed
slight
impact
on
removal.
Activated
exhibited
superior
removal
compared
biochar.
78%
COD
removed
by
only
48%
COD,
at
7
gL−1
biochars.
Pyrolytic
could
64%
better
fluorescent
compounds
adsorption.
Further
revealed
more
selective
higher
molecular
weight
compounds.
In
contrast,
broad
range
weights.
adsorption
efficiency
attributed
changes
specific
characteristics,
such
as
pore
size
distribution
functional
groups.
This
suggests
have
great
capability
