Toxics,
Journal Year:
2024,
Volume and Issue:
12(9), P. 661 - 661
Published: Sept. 10, 2024
The
addition
of
biochar
inevitably
modifies
the
acidity
(pH),
redox
potential
(Eh),
and
dissolved
organic
matter
(DOM)
level
in
soil.
These
alterations
also
have
coupled
effects
on
cycling
iron
(Fe)
composition
bacterial
communities,
thereby
impacting
speciation
availability
arsenic
(As)
This
study
explored
mechanisms
through
which
affects
As
paddy
soil
during
flooded
cultivation
with
different
pyrolysis
temperature
biochars
(300
°C,
400
500
°C)
added.
results
revealed
that
TAs
concentration
increased
initial
15
days
SBC300
or
SBC400
because
increasing
DOM
induced
mobility
though
formation
As-DOM
complexes.
Meanwhile,
elevated
pH,
decreased
Eh,
promoted
transformation
specific
adsorbed
(A-As)
amorphous
oxide-bound
(Amo-Fe-As)
to
supernatant
enhancing
reductive
dissolution
Fe(oxy)(hydr)oxides.
Moreover,
altered
relative
abundance
(V)-reducing
bacteria
(such
as
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Feb. 10, 2025
Paddy
fields
contaminated
by
arsenic-containing
acid
mine
drainage
(AMD)
may
also
have
rich
iron
in
soil.
Whether
this
can
be
loaded
onto
biochar
to
passivate
the
dissolved
arsenic
is
worth
further
exploration.
Soil
was
mixed
with
prepared
at
400,
550,
and
700
°C
incubated
under
alternating
anaerobic
aerobic
conditions.
Soil,
soil
solution
samples
were
analysed
using
ICP-MS,
FTIR,
SEM,
XPS,
etc.
The
results
showed
that
lower
pyrolysis
temperatures
contained
a
higher
number
of
functional
groups.
Under
combined
action
microorganisms,
primarily
from
Firmicutes
phylum,
promoted
dissolution
oxides
soil,
residual
undergoing
transformation.
rapidly
its
surface,
likely
form
Fe3O4
FeOOH,
adsorbed
as
As(III).
Although
detached
over
time,
they
more
stable
on
400
compared
those
temperatures.
Meanwhile,
content
increased,
raising
As/Fe
molar
ratio
above
This
study
lays
foundation
for
exploring
long-term
use
AMD-contaminated
paddy
fields.
