Sorbents Based on Polyacrylonitrile Fiber for Complex Recovery of Artificial 137Cs and Natural Radionuclides from Natural Media
Water,
Journal Year:
2025,
Volume and Issue:
17(2), P. 147 - 147
Published: Jan. 8, 2025
Sorbents
based
on
polyacrylonitrile
fiber,
containing
ferrocyanides
of
transition
metals
and
manganese
oxides
(CoMn-PAN
FeMn-PAN)
or
iron(III)
hydroxide
(CoFe-PAN)
in
their
structure
were
obtained,
as
confirmed
by
the
results
X-ray
diffraction
energy-dispersive
analyses.
The
selectivity
obtained
sorbents
was
investigated,
along
with
ability
to
sorb
Cs,
Ba
(as
an
analog
Ra),
P,
Be
from
various
natural
media,
including
river
water
seawater
varying
salinity
18.2
33.8
‰.
data
show
that
are
universal
for
recovery
artificial
137Cs
radionuclides
environments,
complex
salt
composition
(seawater).
Researching
during
marine
expeditions
efficiency
materials
metal
sorption
137Cs,
7Be,
210Pb,
210Po,
226Ra,
228Ra,
234Th.
Additionally,
sorbent
effective
32P,
33P,
Based
results,
methods
comprehensively
determining
using
these
developed.
Language: Английский
Surface distributions of 228Ra in seas and oceans globally: Implications for water circulation and contaminant transport
Journal of Environmental Radioactivity,
Journal Year:
2024,
Volume and Issue:
278, P. 107468 - 107468
Published: June 8, 2024
Language: Английский
Controls on Dissolved Barium and Radium‐226 Distributions in the Pacific Ocean Along GEOTRACES GP15
Global Biogeochemical Cycles,
Journal Year:
2024,
Volume and Issue:
38(6)
Published: June 1, 2024
Abstract
Radium‐226(
226
Ra)
and
barium
(Ba)
exhibit
similar
chemical
behaviors
distributions
in
the
marine
environment,
serving
as
valuable
tracers
of
water
masses,
ocean
mixing,
productivity.
Despite
their
distributions,
these
elements
originate
from
distinct
sources
undergo
disparate
biogeochemical
cycles,
which
might
complicate
use
tracers.
In
this
study,
we
investigate
processes
by
analyzing
a
full‐depth
section
Ra
activities
(
T
1/2
=
1,600
years)
concentrations
obtained
samples
collected
along
US
GEOTRACES
GP15
Pacific
Meridional
Transect
during
September–November
2018,
spanning
Alaska
to
Tahiti.
We
find
that
surface
waters
possess
low
levels
Ba
due
export
sinking
particulates,
surpassing
inputs
continental
margins.
contrast,
deep
have
higher
particle
regeneration
sedimentary
sources,
with
primarily
resulting
decay
230
Th
sediments.
Further,
dissolved
strong
correlation
section.
To
elucidate
drivers
correlation,
used
mass
analysis,
enabling
us
quantify
influence
mixing
relative
non‐conservative
processes.
While
significant
fraction
each
element's
distribution
can
be
explained
conservative
considerable
cannot.
The
balance
is
driven
using
processes,
such
sedimentary,
rivers,
or
hydrothermal
inputs,
uptake
particles,
remineralization.
Our
study
demonstrates
utility
for
understanding
while
shedding
light
on
myriad
shape
respective
distributions.
Language: Английский
Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean
Geophysical Research Letters,
Journal Year:
2024,
Volume and Issue:
51(20)
Published: Oct. 14, 2024
Abstract
The
international
GEOTRACES
program
has
been
instrumental
in
demonstrating
how
marine
sediments
are
a
critical
source
of
dissolved
Fe
to
the
world's
oceans.
Here,
we
present
iron
(dFe)
from
North
Pacific
GP15
section,
which,
alongside
other
sediment‐source
tracers
(including
δ
56
Fe,
Mn,
228
Ra,
and
particulate
Fe),
allows
for
identification
dFe
provenance
three
distinct
depth
maxima
at
Alaskan
margin.
Two
these
(shelf
abyssal
depths)
local
sedimentary
origin.
third,
mid‐depth
maximum
with
an
absence
is
advected
signal
that,
based
on
tracer
data
Western
transects
circulation
models,
must
be
sources
Asian
margin,
∼5,000
km
away.
This
study
illustrates
importance
measuring
diagnostic
like
radium
when
assigning
margins
as
trace
metal
budgets.
Language: Английский