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Application of multiwall carbon nanotubes impregnated with 5-dodecylsalicylaldoxime for on-line copper preconcentration and determination in water samples by flame atomic absorption spectrometry
Preconcentration
Sorption
Carbon nanotubes
FI-FAAS
Copper determination
Salicylaldoxime
The
paper
presents
application
of
multiwall
carbon
nanotubes
(MWCNTs)
modified
with
5-
dodecylsalicylaldoxime
to
copper(II)
flow-injection
on-line
preconcentration
and
flame
atomic
absorption
spectrometric
(FAAS)
determination.
Two
new
sorbents
were
obtained
by
impregnation
of
MWCNTs
with
Cu(II)-LIX
622
®
complex,
however
in
the
first
case
modification
was
preceded
by
carbon
wall
activation
via
oxidization
(Cu-LIX-CNT-A
sorbent),
and
in
the
second
one
no
surface
activation
was
performed
(Cu-LIX-CNT
sorbent).
It
was
found
that
effective
leaching
of
initially
introduced
copper
and
Cu(II)
retained
in
preconcentration
process
could
be
realized
with
the
use
7%
and
5%
(v/v)
nitric
acid,
for
particular
sorbents.
Testing
the
influence
of
loading
solution
pH
and
rate
of
loading
on
sorption
it
was
found
out
that
optimal
range
of
loading
solution
pH
was
about
4.5-6.3
for
activated
and
6.15-6.25
for
non-activated
CNT.
Investigation
of
sorption
kinetics
showed
that
the
process
can
be
described
by
pseudo-second
order
reaction
model.
Sorption
equilibrium
conditions
(90%
sorption)
for
LIX-CNT-A
and
LIX-CNT
were
obtained
after
8-15
min,
respectively
and
maximum
sorption
capacity
for
the
new
sor-
bents
amounted
to
18.1
mgg
cris.lastimport.scopus | 2024-04-24T06:06:53Z | |
cris.lastimport.wos | 2024-04-10T02:27:27Z | |
dc.abstract.en | The paper presents application of multiwall carbon nanotubes (MWCNTs) modified with 5- dodecylsalicylaldoxime to copper(II) flow-injection on-line preconcentration and flame atomic absorption spectrometric (FAAS) determination. Two new sorbents were obtained by impregnation of MWCNTs with Cu(II)-LIX 622 ® complex, however in the first case modification was preceded by carbon wall activation via oxidization (Cu-LIX-CNT-A sorbent), and in the second one no surface activation was performed (Cu-LIX-CNT sorbent). It was found that effective leaching of initially introduced copper and Cu(II) retained in preconcentration process could be realized with the use 7% and 5% (v/v) nitric acid, for particular sorbents. Testing the influence of loading solution pH and rate of loading on sorption it was found out that optimal range of loading solution pH was about 4.5-6.3 for activated and 6.15-6.25 for non-activated CNT. Investigation of sorption kinetics showed that the process can be described by pseudo-second order reaction model. Sorption equilibrium conditions (90% sorption) for LIX-CNT-A and LIX-CNT were obtained after 8-15 min, respectively and maximum sorption capacity for the new sor- bents amounted to 18.1 mgg$^{-1}$ and 31.6 mgg$^{-1}$, respectively. For the examined sorbents enrichment factors increased with extension of loading time up to 180 s: linearly for activated and non-linearly for non-activated MWCNTs. Influence of potential interferents such as Cd(II), Zn(II), Fe(III), Mg(II) and Ca(II) ions on copper(II) sorption on the new CNT materials was examined individually and with the use of 2$^{5-2}$ factorial design. The study revealed significant interference from iron, magnesium and calcium ions at relatively high concentrations. Applicability of the proposed sorbents was tested for Cu(II) determination in various kinds of water samples and the results were compared with those obtained with the use of ICP MS as a reference technique. Copper(II) determination in two certified reference materials: waste water (EU-H-3) and ground (ES-H-2) water was performed in order to assess trueness of the evaluated preconcentration procedures. Satisfactory values of relative errors were obtained for both procedures. | pl |
dc.affiliation | Wydział Chemii : Zakład Chemii Analitycznej | pl |
dc.contributor.author | Telk, Anna - 156141 | pl |
dc.contributor.author | Walas, Stanisław - 132508 | pl |
dc.contributor.author | Soto Hernández, Arlene | pl |
dc.contributor.author | Mrowiec, Halina - 130778 | pl |
dc.date.accessioned | 2015-09-01T11:00:10Z | |
dc.date.available | 2015-09-01T11:00:10Z | |
dc.date.issued | 2012 | pl |
dc.description.additional | Na publikacji autorka Telk Anna podpisana jako Tobiasz Anna. | pl |
dc.description.physical | 89-95 | pl |
dc.description.points | 40 | pl |
dc.description.volume | 96 | pl |
dc.identifier.doi | 10.1016/j.talanta.2011.12.008 | pl |
dc.identifier.eissn | 1873-3573 | pl |
dc.identifier.issn | 0039-9140 | pl |
dc.identifier.uri | http://ruj.uj.edu.pl/xmlui/handle/item/15206 | |
dc.language | eng | pl |
dc.language.container | eng | pl |
dc.rights | Dodaję tylko opis bibliograficzny | * |
dc.rights.licence | bez licencji | |
dc.rights.uri | * | |
dc.subject.en | Preconcentration | pl |
dc.subject.en | Sorption | pl |
dc.subject.en | Carbon nanotubes | pl |
dc.subject.en | FI-FAAS | pl |
dc.subject.en | Copper determination | pl |
dc.subject.en | Salicylaldoxime | pl |
dc.subtype | Article | pl |
dc.title | Application of multiwall carbon nanotubes impregnated with 5-dodecylsalicylaldoxime for on-line copper preconcentration and determination in water samples by flame atomic absorption spectrometry | pl |
dc.title.journal | Talanta | pl |
dc.title.volume | Selected Papers presented at the 17th ICFIA, Krakow, Poland (2011) | pl |
dc.type | JournalArticle | pl |
dspace.entity.type | Publication |