The
study
aimed
to
evaluate
for
the
first
time
degree
of
contamination
soil
and
crops
with
major
trace
elements
(Cd,
Co,
Cr,
Cu,
Ni,
Pb,
Zn,
F,
Na,
Mg,
Si,
P,
Cl,
Fe,
Al)
in
agricultural
lands
situated
Lower
Danube
Basin,
Galati
Braila
counties
(SE
Romania),
impacted
by
steel
industry.
Soil
samples
from
two
depths
(0–5
cm
5–30
cm),
as
well
leaves
seeds
wheat,
corn,
sunflower,
were
collected
11
different
sites.
Along
elemental
mineralogical
analysis,
performed
HR-CS
AAS,
PIGE,
SEM-EDX
ATR-FTIR,
pH,
texture,
organic
matter,
electric
conductivity
CaCO3
content
investigated.
results
showed
that
levels
Cr
(83.270–383.100
mg
kg-1),
Cu
(17.110–68.151
Ni
(30.157–55.656
F
(319–544
kg-1)
exceeded
Romanian
regulations
sensitive
use
land.
pollution
indices
(Igeo,
EF,
PI,
PERI)
indicate
is
moderate
highly
contaminated
while
CSI
mERMQ
suggested
a
relatively
low
risk
metal
contamination.
concentrations
plant
tissues
bioaccumulation
factors
(BFs)
show
soil-plant
relation
health
risk,
but
also
selectivity
vegetal
compartments.
Thus,
wheat
plants
tend
exclude
certain
their
tissues,
Zn
pattern
different.
In
case
most
BFs
below
1,
indicating
limited
phytoaccumulation
capacity.
However,
exceptions
observed
Cd,
Cu.
Sunflower
higher
bioconcentration
both
compared
other
elements.
Chromium
(Cr)
contributes
non-carcinogenic
dermal
contact
ingestion
hazards,
children
being
more
susceptible
adverse
effects
this
contaminant.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(49), P. 21680 - 21691
Published: Nov. 27, 2024
Sulfate-reducing
microorganisms
(SRMs)
show
promise
for
heavy
metal
removal
from
contaminated
environments,
but
their
scalability
is
limited
by
reliance
on
organic
carbon,
sludge
formation,
and
CO2
emissions.
This
study
investigates
using
photoelectrons
biogenic
(Bio-ZnS)
abiogenic
(Abio-ZnS)
sphalerite
nanoparticles
to
enhance
the
activity
of
Desulfovibrio
desulfuricans
G20
(G20)
sulfate
reduction
lead
without
substrates.
Both
Abio-ZnS
Bio-ZnS
NPs
promote
energy
production
in
cells
under
illumination
addition
substrates,
with
achieving
1.6
times
greater
3.1
higher
ATP
compared
Abio-ZnS.
superior
performance
due
wider
band
gap,
photoconversion
efficiency,
lower
charge-transfer
resistance,
closer
proximity
cells,
which
enable
more
efficient
photoelectron
uptake,
enhanced
intracellular
electron
transfer,
reduced
consumption
motion
filamentation.
The
uptake
also
promotes
G20s
resistance
high
Pb2+
concentrations
through
PbS
precipitation,
biofilm
enzymatic
detoxification,
efflux,
thus
improving
long-term
cyclic
substrate-depleted
conditions.
approach
harnesses
solar
energy,
reduces
lowers
costs
emissions,
offering
a
sustainable
solution
utilizing
SRMs
bioremediation.
AppliedChem,
Journal Year:
2023,
Volume and Issue:
3(4), P. 452 - 476
Published: Sept. 30, 2023
In
order
to
enhance
the
efficiency
of
heavy
metal
ion
extraction
from
aqueous
medium,
new
nanocomposite
magnetic
sorbents
were
synthesized
on
base
natural
zeolite
(Zt)
and
nanoparticles
ZnFe2O4
(F).
The
composition,
structure
physical–chemical
properties
composites
with
2%
(Zt-2F),
8%
(Zt-8F)
16%
(Zt-16F)
zinc
ferrite
characterized
by
XRD,
BET
adsorption–desorption
nitrogen,
SEM
elemental
mapping,
TEM
magnetometry.
sorption
capacity
materials
was
assessed
towards
Cu2+
ions
in
solutions,
for
which
kinetic
equilibrium
features
established.
maximal
(amax,
mg/g)
studied
increased
order:
Zt
(19.4)
<
Zt-2F
(27.3)
Zt-8F
(30.2)
Zt-16F
(32.8)
(161.3).
kinetics
process
followed
a
pseudo-second
model.
at
successfully
described
Langmuir
model,
while
Freundlich
model
better
fitted
composites.
320
mg/dm3
solution
63%
composite
100%
sample
ZnFe2O4.
It
established
that
proposed
provide
operation
several
cycles
without
regeneration,
they
can
be
easily
recycled
0.1
N
HCl
are
capable
separation.
advantages
method
synthesis
allow
recommending
these
as
effective
metals
wastewater.
The
study
aimed
to
evaluate
for
the
first
time
degree
of
contamination
soil
and
crops
with
major
trace
elements
(Cd,
Co,
Cr,
Cu,
Ni,
Pb,
Zn,
F,
Na,
Mg,
Si,
P,
Cl,
Fe,
Al)
in
agricultural
lands
situated
Lower
Danube
Basin,
Galati
Braila
counties
(SE
Romania),
impacted
by
steel
industry.
Soil
samples
from
two
depths
(0–5
cm
5–30
cm),
as
well
leaves
seeds
wheat,
corn,
sunflower,
were
collected
11
different
sites.
Along
elemental
mineralogical
analysis,
performed
HR-CS
AAS,
PIGE,
SEM-EDX
ATR-FTIR,
pH,
texture,
organic
matter,
electric
conductivity
CaCO3
content
investigated.
results
showed
that
levels
Cr
(83.270–383.100
mg
kg-1),
Cu
(17.110–68.151
Ni
(30.157–55.656
F
(319–544
kg-1)
exceeded
Romanian
regulations
sensitive
use
land.
pollution
indices
(Igeo,
EF,
PI,
PERI)
indicate
is
moderate
highly
contaminated
while
CSI
mERMQ
suggested
a
relatively
low
risk
metal
contamination.
concentrations
plant
tissues
bioaccumulation
factors
(BFs)
show
soil-plant
relation
health
risk,
but
also
selectivity
vegetal
compartments.
Thus,
wheat
plants
tend
exclude
certain
their
tissues,
Zn
pattern
different.
In
case
most
BFs
below
1,
indicating
limited
phytoaccumulation
capacity.
However,
exceptions
observed
Cd,
Cu.
Sunflower
higher
bioconcentration
both
compared
other
elements.
Chromium
(Cr)
contributes
non-carcinogenic
dermal
contact
ingestion
hazards,
children
being
more
susceptible
adverse
effects
this
contaminant.
