SSRN Electronic Journal,
Journal Year:
2022,
Volume and Issue:
unknown
Published: Jan. 1, 2022
Antimony
(Sb)
is
considered
by
Europe
to
be
a
critical
raw
material
whose
primary
production
will
need
increase
in
forthcoming
decades
meet
technological
needs.
So
efforts
are
needed
develop
exploration
methods
for
ore
deposits
and
their
environmentally
sustainable
exploitation.
This
work
aims
establish
Sb
mobility,
its
transfer
biota
effect
on
soil
health
semi-arid
climate.
The
results
show
the
presence
of
stibnite
(Sb2S3)
as
main
compound,
bindhemite
(Pb2Sb2O6(O,OH)),
minor
proportions
stibiconite
(Sb3+(Sb5+)2O6(OH))
oxidised
species.
research
also
observes
very
high
total
contents
mining
materials
(max:
20,000
mg
kg-1)
soils
(400-3000
kg-1),
with
physical
dispersion
around
restricted
450
m.
soil-to-plant
low,
(bioaccumulation
factor:
0.0002-0.1520).
Most
remains
residual
fraction
(99.9%),
low
bound
Fe
Mn
oxy-hydroxides
or
organic
matter,
negligible
proportion
leachable.
long-term
leachability
test
reveals
higher
mobility
rates
under
oxidising
conditions
long
contact
time
between
solids
water.
evaluation
provides
inconclusive
results,
enzymatic
dehydrogenase
activity
values
that
comparable
those
generally
observed
affected
contamination.
factors
explain
poor
area
annual
rainfall
slow
down
mobilisation
process
scarce
formation
compounds.
All
these
data
suggest
SbIII
toxicological
risk
associated
past
activities.
These
good
prospects
future
such
climate
geochemical
limitations
discover
new
deposits.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: May 11, 2023
Abstract
Sources
of
neurotoxic
mercury
in
forests
are
dominated
by
atmospheric
gaseous
elemental
(GEM)
deposition,
but
a
dearth
direct
GEM
exchange
measurements
causes
major
uncertainties
about
processes
that
determine
sinks.
Here
we
present
three
years
forest-level
deposition
coniferous
forest
and
deciduous
northeastern
USA,
along
with
flux
partitioning
into
canopy
floor
contributions.
Annual
is
13.4
±
0.80
μg
m
−2
(coniferous
forest)
25.1
2.4
(deciduous
dominating
inputs
(62
76%
total
deposition).
uptake
dominates
daytime
during
active
vegetation
periods
correlates
CO
2
assimilation,
attributable
to
plant
stomatal
mercury.
Non-stomatal
occurs
the
nights
accounts
for
24
39%
respectively.
Our
study
shows
includes
various
pathways
highly
ecosystem-specific,
which
complicates
global
constraints
terrestrial
Critical Reviews in Environmental Science and Technology,
Journal Year:
2021,
Volume and Issue:
52(24), P. 4331 - 4352
Published: Oct. 15, 2021
Foliar
accumulation
of
atmospheric
mercury
(Hg),
particularly
gaseous
elemental
(Hg(0)),
accounts
for
a
significant
amount
Hg
deposition
and
influences
the
geochemical
cycle.
occurs
as
net
result
uptake,
adsorption,
fixation,
re-emission,
other
processes.
The
combination
these
processes
foliar
speciation,
translocation,
toxicity,
transport,
bioavailability,
which
eventually
affects
environmental
risk
Hg.
Therefore,
systematic
understanding
various
involved
in
is
urgently
needed.
This
review
summarizes
current
knowledge,
research
progress,
remaining
knowledge
gaps
regarding
biochemical
mechanisms
involved.
Atmospheric
biochemically
fixed
within
foliage
after
stomatal
and/or
nonstomatal
with
then
volatilized
reduction,
washed
off
via
throughfall,
deposited
on
soil
surfaces
litterfall
or
stored
vegetation
over
time.
Mechanisms
underlying
future
perspectives
are
hereby
discussed
aim
reducing
accumulation.
different
methods,
such
speciation
analysis,
isotope
tracer
techniques,
element
imaging,
biological
technologies,
ecologically
microcosmic
will
help
clarify
transformation,
subcellular
distribution
foliage,
quantitate
fluxes
during
decomposition.
Measurements
modeling
process
under
natural
human
perturbations
also
essential.
These
investigations
comprehensively
understand
influencing
interactions
evaluate
fates
risks
ACS Omega,
Journal Year:
2021,
Volume and Issue:
6(18), P. 11849 - 11856
Published: April 30, 2021
Mercury
and
its
compounds
are
toxic
substances,
whose
uncontrolled
presence
in
the
environment
represents
a
danger
to
ecosystems
organisms
that
inhabit
it.
For
this
reason,
work,
we
carried
out
study
of
mercury
[Hg(II)]
adsorption
from
aqueous
solution
on
functionalized
activated
carbon.
The
carbons
were
prepared
by
chemical
activation
mango
seed
with
solutions
CaCl2
H2SO4
at
different
concentrations,
later,
carbonaceous
materials
Na2S,
aim
increasing
sulfur
content
matrix
affinity
mercury.
characterized
using:
proximal
analysis,
scanning
electron
microscopy,
Boehm
titrations,
point
zero
charge
(pHPZC),
infrared
spectroscopy.
Additionally,
immersion
calorimetries
performed
solution.
results
textural
characterization
show
low
Brunauer–Emmett–Teller
(BET)
surface
areas
between
2
33
m2·g–1
pore
volumes.
However,
they
had
rich
chemistry
oxygenated
groups.
enthalpies
−31.71
−77.31
J·g–1,
showing
correlation
magnitude
enthalpic
data
capacity
materials.
It
was
evidenced
functionalization
process
produces
decrease
area
volume
carbons,
an
increase
matrix.
generated
21
49%
compared
those
nonfunctionalized
materials,
reaching
maximum
85.6
mgHg2+g–1.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(42), P. 15892 - 15903
Published: Oct. 3, 2023
To
understand
the
role
of
vegetation
and
soil
in
regulating
atmospheric
Hg0,
exchange
fluxes
isotope
signatures
Hg
were
characterized
using
a
dynamic
flux
bag/chamber
at
atmosphere-foliage/soil
interfaces
Davos-Seehornwald
forest,
Switzerland.
The
foliage
was
net
Hg0
sink
took
up
preferentially
light
isotopes,
consequently
resulting
large
shifts
(-3.27‰)
δ202Hg
values.
served
mostly
as
sources
with
higher
emission
from
moss-covered
soils
than
bare
soils.
negative
shift
Δ199Hg
values
efflux
air
relative
to
ambient
Δ199Hg/Δ201Hg
ratio
among
air,
pore
gas
highlight
that
re-emission
strongly
constrained
by
evasion
together
microbial
reduction.
isotopic
mass
balance
model
indicates
8.4
times
caused
surface
photoreduction.
Deposition
noticeably
3.2
foliage,
reflecting
high
significance
influence
signatures.
This
study
improves
our
understanding
subalpine
coniferous
forests,
which
is
indispensable
assessment
forest
biogeochemical
cycling.
