Agriculture,
Год журнала:
2023,
Номер
13(12), С. 2226 - 2226
Опубликована: Ноя. 30, 2023
The
rapid
quantification
of
nitrate
nitrogen
concentration
plays
a
pivotal
role
in
monitoring
soil
nutrient
content.
Nevertheless,
the
low
detection
efficiency
limits
application
traditional
methods
testing.
For
this
investigation,
we
utilized
digital
microfluidic
platform
and
3D-printed
microfluidics
to
accomplish
automated
with
high
sensitivity
across
numerous
samples.
system
combines
(DMF),
microfluidics,
peristaltic
pump,
spectrometer.
solution,
obtained
after
extraction,
was
dispensed
onto
using
micropipette.
regulated
movement
droplets
until
they
reached
injection
area,
where
were
then
aspirated
into
device
for
absorbance
detection.
Implementing
approach
allows
convenient
sequential
testing
multi-samples,
thereby
enhancing
results
demonstrate
that
exhibits
(200
s
three
samples),
reagent
consumption
(40
µL
per
sample),
limit
(95
µg/L).
In
addition,
relative
error
between
detected
measured
by
ultraviolet
spectrophotometry
is
kept
within
20%,
standard
deviation
(RSD)
samples
0.9%
4.7%.
foreseeable
future,
will
play
significant
improving
guiding
fertilization
practices.
Analytical Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 21, 2025
It
is
still
challenging
to
perform
a
high-throughput
digestion
on
limited
amounts
of
sample
prior
elemental
analysis
by
atomic
spectrometry.
Herein,
photochemical
reactor
consisting
quartz
tube
inserted
into
low-pressure
mercury
lamp
was
used
fabricate
flow
droplet
photodigestion
(FD-PD)
device
for
the
small
samples.
A
mixture
containing
20
μL
blood
sample,
H2O2,
and
10
HNO3
pumped
passed
through
before
its
online
hydride
generation
fluorescence
spectrometry
(HG-AFS).
The
developed
provides
significantly
higher
oxidation
capability
than
conventional
ultraviolet
(UV)
since
vacuum
UV
irradiation
below
200
nm
from
directly
irradiates
samples
with
high
transmittance,
enabling
complete
within
2
min.
Compared
methods,
proposed
method
retains
several
unique
advantages
throughput
(57
pcs
h–1),
lower
mineral
acid,
oxidant
consumption,
shorter
time,
facilitating
painless
children.
Limits
detection
(LODs)
0.25
0.15
μg
L–1
were
obtained
As
Hg,
respectively,
precisions
(relative
standard
deviations
(RSDs),
n
=
11,
2.0
L–1)
better
4%.
practicality
FD-PD-HG-AFS
confirmed
detecting
Hg
in
one
two
urine
certified
reference
materials
(CRMs),
as
well
children's
satisfactory
recoveries
(93%–109%).
This
study
provides
a
comprehensive
examination
of
an
innovative
technique
for
the
precise,
contamination-free
manipulation
non-magnetic
marbles
carried
by
ferrofluid
liquid
marble
under
direct
current
and
pulsating
magnetic
fields.
