Atmosphere,
Journal Year:
2024,
Volume and Issue:
15(12), P. 1536 - 1536
Published: Dec. 21, 2024
Studying
chemical
constituents
in
rainwater
can
provide
insights
into
the
origin,
characteristics,
concentration,
and
processes
involved
clearing
atmospheric
pollutants.
This
study
investigated
spatial–temporal
variations
chemistry
characteristics
a
rapidly
urbanizing
area
of
Shenzhen
from
2007
to
2022.
The
mean
pH
during
2007–2022
was
5.12
±
0.45,
significantly
higher
than
4.51
recorded
2006.
electrical
conductivity
(EC)
rainfall
15.79
2.63
μS/cm
showed
progressive
decrease
over
years.
Human
activities
influenced
trends
SO42−,
which
decreased,
while
NO3−
Cl−
increased
time.
cations
Ca2+
NH4+
Mg2+,
Na+,
K+
increased.
In
recent
years,
Na+
Cl−,
typical
sea-salt
ions,
became
dominant
with
continually
rising
contribution.
also
revealed
that
has
been
affected
by
both
sulfuric
nitric
acid
rain,
formally
ushering
acid-type
era.
Spatial
chemicals
were
observed,
especially
for
conductivity,
attributed
urban
growth,
distance
coast,
industrial
development.
Moreover,
total
ion
concentration
demonstrated
high
values
spring
low
summer
due
significant
effect
precipitation.
Journal of Separation Science,
Journal Year:
2025,
Volume and Issue:
48(4)
Published: April 1, 2025
ABSTRACT
With
the
increasing
environmental
pollution
issues,
there
is
a
growing
need
for
sensitive
and
real‐time
monitoring
of
pollutants.
Nitrite
nitrate
are
common
nutrients
that
related
to
water
quality.
This
study
aims
enhance
nitrite
detection
capabilities
using
portable
ion
chromatography‐based
nutrient
analyzer,
Aquamonitrix.
By
optimizing
it
ultra‐low
limits
(LODs),
we
address
challenges
in
quality
assessment
Tasmania,
Australia.
Using
step‐gradient
mode
with
stereolithography
three‐dimensional
printed
flow
cell
5
cm
optical
path
length,
300
µL
injection
loop,
60
mM
KOH
as
eluent,
LODs
0.004
µg/mL
0.023
were
achieved.
Further
improving
0.008
10
length
120
NaCl
eluent.
A
repeatability
over
84
automatic
runs
showed
relative
standard
deviation
under
1.42%
peak
area
0.49%
retention
time.
The
system
demonstrated
tolerance
salinity,
handling
up
parts
per
thousand
artificial
seawater.
Comparative
analysis
samples
revealed
levels
Tasmanian
rainwater
five
times
lower
than
Ireland.
An
average
concentration
2.08
was
found
Tamar
River
samples,
aligning
local
commercial
lab
data.
Real‐time,
on‐site
along
Derwent
detected
an
0.17
µg/mL.
Validation
against
conventional
chromatography
no
significant
differences
(
p
>
0.05),
underscoring
Aquamonitrix's
robustness
field‐based
monitoring.
5‐day
deployment
Aquamonitrix
further
system's
reliability
temperature
fluctuations
between
day
night.
Agricultural
activities
in
the
Global
South
contribute
significantly
to
both
point
source
pollutants
and
non-point
(NPS)
pollutants,
which
have
profound
implications
for
environmental
quality
human
health.
This
chapter
examines
these
pollutants'
sources,
characteristics,
impacts,
highlighting
key
challenges
potential
mitigation
strategies.
Point
often
originating
from
concentrated
animal
feeding
operations,
include
nutrient-rich
runoff
pathogens
that
can
contaminate
water
bodies,
leading
eutrophication
waterborne
diseases.
Non-point
primarily
associated
with
pesticide
fertiliser
use,
result
soil
contamination,
threatening
ecosystems
groundwater
resources.
The
faces
unique
managing
due
limited
resources,
knowledge
gaps,
competing
socio-economic
priorities.
However,
adopting
sustainable
agricultural
practices,
enhancing
regulatory
frameworks,
promoting
farmer
education
awareness
help
mitigate
adverse
effects
of
South,
safeguarding
environment
public
Collaborative
efforts
among
governments,
non-governmental
organisations
(NGOs),
international
agencies
are
essential
address
complex
issues
effectively.
