Water Resources Research,
Год журнала:
2020,
Номер
56(2)
Опубликована: Янв. 31, 2020
Abstract
High
arsenic
(As)
groundwater
is
frequently
found
in
inland
basins,
yet
the
contributions
of
different
processes
to
aqueous
As
distributions
remain
unresolved.
In
Hetao
Basin,
a
typical
basin,
concentrations
generally
increased
from
alluvial
fan
through
transition
area
flat
plain.
A
geochemical
process‐based
reactive
transport
model
was
established
evaluate
and
quantify
mobilization
northwestern
Basin.
Thirty‐six
samples
eight
sediment
were
collected
plain
investigate
characteristics
system.
Along
approximate
flow
path,
evolved
oxic‐suboxic
conditions
anoxic
conditions,
with
increasing
As,
Fe
(II),
NH
4
+
,
decreasing
Eh
SO
2−
/Cl
−
.
Modeling
results
indicated
that
observed
(II)
caused
by
reductive
dissolution
(III)
oxides
subsequent
precipitation
mackinawite
siderite.
Reductive
primarily
driven
organic
matter
degradation
(>75%),
followed
H
2
S
oxidation
(<25%).
More
sequestered
adsorption
than
released
via
abiotic
reduction
S.
dominant
mechanism
for
liberating
both
(>70%),
desorption
under
elevated
pH
competitive
HCO
3
PO
3−
made
an
important
contribution
enrichment
(up
30%).
Overall,
this
study
provides
insight
into
relative
basins.
Critical Reviews in Environmental Science and Technology,
Год журнала:
2020,
Номер
51(24), С. 2895 - 2933
Опубликована: Авг. 21, 2020
Chronic
exposure
to
geogenic
contaminated
groundwaters
(GCGs)
has
caused
serious
health
problems
among
billions
of
people
worldwide.
The
hydrogeological
features,
main
sources
hazardous
substances,
dominant
hydrogeochemical
processes
and
key
factors
controlling
the
occurrence
high
arsenic
(As
≥
10
μg/L),
fluoride
(F
1
mg/L),
iodine
(I
100
μg/L)
groundwater
are
discussed
in
this
review.
Although
global
and/or
regional
occurrence,
environmental
geochemical
behaviors
As,
F
I
have
been
well
documented
past
three
decades,
there
is
still
a
lack
holistic
theoretical
analysis
demonstrate
patterns
their
(co)occurrence.
We
here
propose
four
basic
genetic
types
GCGs
by
summarizing
characteristics
distribution
major
processes:
leaching-enrichment
type,
burial-dissolution
compaction-release
evaporation-concentration
type.
complex
mechanisms
thus
integrated
into
new
framework
improve
our
understanding
genesis
capability
predicting
spatial
temporal
distribution.
Moreover,
paradigms
interdisciplinary
convergent
research
required
find
best
solutions
ensure
sustainable
safe
supply
resources
well-being
groundwater-dependent
ecosystems
human
society.
Water,
Год журнала:
2023,
Номер
15(3), С. 478 - 478
Опубликована: Янв. 25, 2023
Water
contaminated
with
arsenic
is
a
worldwide
problem.
This
review
presents
the
contamination
in
groundwater,
its
sources,
and
possible
health
risk
to
humans.
Groundwater
pollution
most
common
route
of
inorganic
exposure
Arsenic
concentrations
different
countries
were
analyzed
projected
on
map.
Because
widely
spread
throughout
Earth’s
crust,
it
present
trace
amounts
practically
all
waterways.
Harmful
levels
this
toxin
have
been
identified
drinking
water
some
regions.
For
purposes,
majority
people
use
groundwater;
excess
groundwater
linked
variety
negative
impacts
people.
world’s
leading
environmental
cause
cancer.
The
main
aim
summarize
effective
technologies
remove
from
water,
such
as
ion
exchange,
coagulation/flocculation,
membrane
like
ultra-filtration
electrodialysis,
helping
deal
adverse
effects
caused
by
exposure.
All
these
advantages
disadvantages.
Electrocoagulation,
adsorption,
phytoremediation
are
efficient
cost-effective
technologies.
removal
efficiencies
using
prospects
also
included.
Environmental Science & Technology,
Год журнала:
2020,
Номер
54(12), С. 7280 - 7290
Опубликована: Май 14, 2020
Molecular
characteristics
of
natural
organic
matter
(NOM)
and
their
potential
connections
to
arsenic
enrichment
processes
remain
poorly
understood.
Here,
we
examine
dissolved
(DOM)
in
groundwater
water-soluble
(WSOM)
aquifer
sediments
being
depth-matched
with
samples
from
a
typical
arid–semiarid
basin
(Hetao
Basin,
China)
hosting
high
groundwater.
We
used
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
determine
molecular
DOM
WSOM
evaluate
roles
biodegradable
compounds
microbially
mediated
mobility
at
the
level.
High-arsenic
was
generally
enriched
recalcitrant
molecules
(including
lignins
aromatic
structures).
Although
contribution
cannot
be
ruled
out,
preferential
degradation
labile
coupled
reduction
Fe(III)
(oxyhydr)oxides
seemed
dominate
mobilization.
Both
number
intensity
aliphatic/proteins
carbohydrates)
were
higher
than
those
high-arsenic
(arsenic
>0.67
μmol/L
or
50
μg/L).
Groundwater
concentration
increased
increase
unique
(especially
N-containing
compounds)
matched
depths.
Anoxic
incubations
deionized
water
show
that
more
Fe(II)
released
greater
numbers
intensities
consumed
compounds),
proportion
derived
produced.
These
observations
indicate
biodegradation
carbohydrates
CHON
formulas)
fueling
reductive
dissolution
predominantly
promotes
release
solids.
Our
data
present
better
understanding
mobilization
shaped
by
microbial
anoxic
aquifers
